S-1 1 a2208385zs-1.htm S-1

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As filed with the Securities and Exchange Commission on March 23, 2012

Registration No. 333-            

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549



Form S-1
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933



TESARO, Inc.
(Exact name of registrant as specified in its charter)



Delaware
(State or other jurisdiction of incorporation or organization)
  2834
(Primary Standard Industrial
Classification Code Number)
  27-2249687
(I.R.S. Employer
Identification Number)

1000 Winter Street, Suite 3300
Waltham, Massachusetts 02451
(339) 970-0900

(Address, including zip code, and telephone number, including area code, of registrant's principal executive offices)

Leon O. Moulder, Jr.
Chief Executive Officer
TESARO, Inc.
1000 Winter Street, Suite 3300
Waltham, Massachusetts 02451
(339) 970-0900

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:

Asher M. Rubin
William I. Intner
Hogan Lovells US LLP
100 International Drive, Suite 2000
Baltimore, Maryland 21202
(410) 659-2700

 

Patrick A. Pohlen
Latham & Watkins LLP
140 Scott Drive
Menlo Park, California 94025
(650) 328-4600



Approximate date of commencement of proposed sale to the public:
As soon as practicable after this Registration Statement becomes effective.

         If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act, check the following box. o

         If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. o

         If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. o

         If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. o

         Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer o   Accelerated filer o   Non-accelerated filer ý
(Do not check if a
smaller reporting company)
  Smaller reporting company o

CALCULATION OF REGISTRATION FEE

             
   
Title of Each Class of
Securities to be Registered

  Proposed Maximum
Aggregate Offering Price(1)(2)

  Amount of Registration Fee
 
   

Common Stock, $0.0001 par value per share

  $ 86,250,000   $ 9,885  

 

 
(1)
Estimated solely for purposes of determining the registration fee in accordance with Rule 457(o) under the Securities Act of 1933, as amended.

(2)
Includes shares of common stock which may be purchased by the underwriters to cover over-allotments, if any.

         The Registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the Registrant shall file a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933, as amended, or until this Registration Statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to said Section 8(a), may determine.

   


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The information in this preliminary prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This preliminary prospectus is not an offer to sell these securities and we are not soliciting offers to buy these securities in any state or other jurisdiction where the offer or sale is not permitted.

Subject to completion, dated March 23, 2011

PRELIMINARY PROSPECTUS

LOGO

                    Shares

TESARO, Inc.

Common Stock

$      per share

        This is the initial public offering of our common stock. We are selling            shares of common stock in this offering. Prior to this offering, there has been no public market for our common stock. The initial public offering price of our common stock is expected to be between $        and $        per share.

        We intend to apply to list our common stock on the NASDAQ Global Market under the symbol "TSRO."



        Investing in our common stock involves risks. See "Risk Factors" beginning on page 9.

        Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

       
 
 
  Per Share
  Total
 

Initial public offering price

  $         $      
 

Underwriting discounts and commissions

  $         $      
 

Proceeds to TESARO, before expenses

  $         $      

 

        We have granted the underwriters an option to purchase up to                    additional shares of common stock to cover over-allotments.

        The underwriters expect to deliver the shares on or about                        , 2012.



Citigroup   Morgan Stanley   Leerink Swann



BMO Capital Markets       Baird

   

                        , 2012


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        We have not, and the underwriters have not, authorized anyone to provide you with any information other than that contained in this prospectus or in any free writing prospectus we may authorize to be delivered or made available to you. We take no responsibility for, and can provide no assurance as to the reliability of, any other information that others may give you. This prospectus may only be used where it is legal to offer and sell shares of our common stock. The information in this prospectus is complete and accurate only as of the date on the front cover of this prospectus, regardless of the time of delivery of this prospectus or any sale of shares of our common stock. Our business, financial condition, results of operations and prospects may have changed since that date. We are not, and the underwriters are not, making an offer of these securities in any jurisdiction where the offer is not permitted.

        Until and including                        , 2012 (25 days after the commencement of this offering), all dealers that buy, sell or trade shares of our common stock, whether or not participating in this offering, may be required to deliver a prospectus. This delivery requirement is in addition to the dealers' obligation to deliver a prospectus when acting as underwriters and with respect to their unsold allotments or subscriptions.

        For investors outside the United States: Neither we nor the underwriters have done anything that would permit this offering or possession or distribution of this prospectus in any jurisdiction where action for that purpose is required, other than in the United States. Persons outside the United States who come into possession of this prospectus must inform themselves about, and observe any restrictions relating to, the offering of the shares of common stock and the distribution of this prospectus outside the United States.

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PROSPECTUS SUMMARY

        The following summary highlights information contained elsewhere in this prospectus and is qualified in its entirety by the more detailed information and consolidated financial statements included elsewhere in this prospectus. This summary does not contain all of the information that may be important to you. You should read and carefully consider the following summary together with the entire prospectus, including our consolidated financial statements and the related notes thereto appearing elsewhere in this prospectus and the matters discussed in the sections in this prospectus entitled "Risk Factors," "Selected Consolidated Financial Data" and "Management's Discussion and Analysis of Financial Condition and Results of Operations," before deciding to invest in our common stock. Some of the statements in this prospectus constitute forward-looking statements that involve risks and uncertainties. See "Special Note Regarding Forward-Looking Statements and Industry Data." Our actual results could differ materially from those anticipated in such forward-looking statements as a result of certain factors, including those discussed in the "Risk Factors" and other sections of this prospectus.

        Except as otherwise indicated herein or as the context otherwise requires, references in this prospectus to "TESARO," "the Company," "we," us," and "our," refer to TESARO, Inc., together with its consolidated subsidiary.

Overview

        We are an oncology-focused biopharmaceutical company dedicated to improving the lives of cancer patients. We have in-licensed and are currently developing two product candidates, rolapitant and TSR-011. We intend to continue to leverage the experience and competencies of our senior management team to identify, acquire, develop and commercialize cancer therapeutics and oncology supportive care products that are safer and more effective than existing treatments. Upon successful development and regulatory approval of any of our product candidates we intend to make them available to cancer patients in North America, Europe and China through our own commercialization efforts and to establish a network of licensees and distributors in other geographic areas

        Many marketed products and product candidates in development treat cancer through non-specific damage to cellular components or alter cell metabolism or internal repair mechanisms leading to the demise of cancer cells. More recently, targeted anti-cancer agents have been designed by scientists to inhibit the action of specific molecules within cancer cells that drive the aberrant growth responsible for tumor development. Certain of these targeted agents are developed in conjunction with companion diagnostic tests that are used by clinicians to determine if a patient's cancerous tumor contains these specific molecules and is, therefore, more likely to respond to a particular targeted therapy.

        All of these approaches may be associated with various cancer treatment side effects including, but not limited to, nausea and vomiting. Supportive care products are frequently prescribed or administered to cancer patients to prevent or treat these side effects, thereby allowing the patients to continue to receive potentially life-prolonging cancer therapies. Our product portfolio currently consists of two oncology-related product candidates:

    Rolapitant, a potent and long-acting neurokinin-1, or NK-1, receptor antagonist currently in Phase 3 clinical trials for the prevention of chemotherapy induced nausea and vomiting, or CINV; and

    TSR-011, an orally available anaplastic lymphoma kinase, or ALK, inhibitor (targeted anti-cancer agent) currently in preclinical development. We plan to test TSR-011 in clinical trials as a treatment for non-small cell lung cancer, or NSCLC, and potentially other cancer indications.

        We were founded in March 2010 by former executives of MGI PHARMA, Inc., or MGI PHARMA, an oncology and acute-care focused biopharmaceutical company. While at MGI PHARMA, our senior management team collaborated in the clinical development and commercialization of several

 

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cancer therapeutics and oncology supportive care products, including Aloxi (palonosetron HCl) for CINV. In developing and commercializing TESARO's product candidates, we believe we will be able to leverage our senior management team's long-standing experience with key opinion leaders, patient groups, payors, oncology networks, cancer centers, oncologists, oncology nurses, and pharmacists.

        Our investors include the following entities or their affiliates: New Enterprise Associates, InterWest Partners, Kleiner Perkins Caufield Byers, T. Rowe Price, Venrock, Oracle Investment Management, Pappas Ventures, Deerfield Capital, Leerink Swann, Frost Gamma Investments and our management team. To date, we have not generated any revenues.

Our Strategy

        Our strategy is based upon our belief that it is efficient and effective to focus our efforts on both cancer therapeutics and oncology supportive care because the same treatment centers and healthcare professionals can be covered by a single sales and marketing organization.

        The key components of our strategy are:

    Rapidly develop and successfully commercialize rolapitant for the prevention of CINV.  We recently initiated our global Phase 3 clinical program for rolapitant, approximately one year after in-licensing this product candidate. We expect to report top line Phase 3 clinical trial data for rolapitant in the second half of 2013.

    Advance TSR-011 through clinical trials for the treatment of NSCLC and other tumor types associated with ALK mutations.  We intend to pursue an accelerated development pathway for TSR-011 that, if successful, will enable us to reduce the time to receive regulatory approval for this product candidate. We plan to file an IND for TSR-011 during the second half of 2012.

    In-license or acquire additional product candidates to create a balanced product portfolio.  We intend to in-license or acquire additional product candidates across various stages of development. We intend to focus on product candidates that we believe are differentiated from existing cancer therapeutics and oncology supportive care products and that have well defined, and potentially expeditious, clinical and regulatory pathways.

    Build global capabilities to maximize the value of our product candidates.  We are developing rolapitant, and intend to develop TSR-011 and any future product candidates, on a global basis in order to more rapidly accrue patients and support regulatory submission to health authorities outside of the United States. We currently plan to commercialize our portfolio of cancer therapeutics and oncology supportive care products by deploying fully integrated sales and marketing and medical affairs organizations in core strategic markets.

Our Product Candidates

        Consistent with our strategy to develop and commercialize cancer therapeutics and oncology supportive care products, rolapitant is being developed for the prevention of CINV and TSR-011 is being developed for the treatment of NSCLC and potentially other cancer indications.

Rolapitant

        Rolapitant is a potent and long-acting NK-1 receptor antagonist that is being developed for the prevention of CINV and is currently being studied in Phase 3 clinical trials. CINV, if not prevented by prophylaxis, has the potential to afflict up to 90% or more of cancer patients undergoing chemotherapy, depending upon the type of chemotherapy administered, the dosing schedule of the chemotherapy, and the patients' age and gender, among other predisposing factors. Prolonged nausea and vomiting may result in unwanted weight loss, dehydration and malnutrition as well as

 

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hospitalization. If not prevented, CINV may result in a delay or even discontinuation of chemotherapy treatment. We estimate that annually in the United States there are nearly 7 million treatments administered on the first day of chemotherapy consisting of the current standard of care for the prevention of CINV. Based on current treatment guidelines, we estimate that 70% to 80% of cancer patients being treated with the current standard of care for CINV should also receive treatment with an NK-1 receptor antagonist. EMEND, marketed by Merck & Co., Inc., or Merck, is currently the only NK-1 receptor antagonist on the market. In 2011, EMEND generated $419 million in revenues globally.

        We are investigating whether a single dose of rolapitant will, when administered along with the current standard of care for CINV, significantly increase the control of both nausea and vomiting over the 5-day period of risk for cancer patients receiving emetogenic chemotherapy as compared to the current standard of care alone. We plan to present data from a 454-patient, randomized, placebo controlled Phase 2 clinical trial that evaluated rolapitant in patients at high risk of CINV at the American Society of Clinical Oncology conference in June 2012. We expect to report top line results for our ongoing Phase 3 clinical program for rolapitant during the second half of 2013.

        We believe that rolapitant has several important characteristics, including:

    rapid onset;

    long duration of treatment (approximately five days with one dose);

    low potential for drug-drug interactions; and

    meaningful impact on reducing nausea.

        We in-licensed the exclusive worldwide rights to rolapitant from OPKO Health, Inc., or OPKO. OPKO had acquired certain NK-1 receptor related assets in 2010, including rolapitant, from Schering-Plough Corporation, or Schering-Plough, as part of a United States Federal Trade Commission requirement to divest certain assets in connection with Schering-Plough's combination with Merck. Prior to its divestiture of rolapitant, Schering Plough evaluated rolapitant in over 1,000 subjects, including studies for the prevention of post-operative nausea and vomiting, or PONV, and chronic cough, and completed a Phase 2 clinical trial in patients at high risk for CINV.

        We intend to leverage the experience that our senior management team gained at MGI PHARMA to establish rolapitant as part of the standard of care for the prevention of CINV in patients who, per established treatment guidelines, could benefit from an NK-1 receptor antagonist in addition to the current treatment with a 5-HT3 receptor antagonist. While at MGI PHARMA, in 2003 our senior management team successfully launched and commercialized Aloxi, a 5-HT3 receptor antagonist for the prevention of CINV, in the United States. Aloxi, based on revenues, became the largest product in its class in 2006. This success was despite the fact that Aloxi was the fourth 5-HT3 receptor antagonist to market in the United States and competed with products sold by GlaxoSmithKline plc, Roche Holding Ltd. and Sanofi S.A.

TSR-011

        TSR-011, our second product candidate, is an orally available ALK inhibitor currently in preclinical development. We plan to test TSR-011 in clinical trials as a treatment for NSCLC and potentially other cancer indications. Although the ALK gene is not widely expressed in adults, ALK is known to be involved in certain types of cancers, including subsets of NSCLC, neuroblastoma and lymphoma. For patients in these subsets, the ALK gene is fused to an activating partner or contains point mutations, resulting in constitutive activation of ALK and the growth of cancer cells and tumor development. Inhibition of ALK in these cancer cells results in cell death and tumor growth inhibition or regression.

        The limited tissue distribution and expression of ALK in adult subjects means that ALK may be a good molecular target for a cancer therapeutic because an ALK inhibitor would primarily affect cancer

 

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cells and tumors. In August 2011, the United States Food and Drug Administration approved the first ALK inhibitor, developed by Pfizer Inc., Xalkori (crizotinib), which was approved for the treatment of patients with locally advanced or metastatic NSCLC that are ALK positive. TSR-011 was specifically designed to be selective for, bind tightly to and inhibit the activity of the ALK protein to result in the death of cancer cells and the shrinking of tumors.

        We plan to develop TSR-011 for oncology indications, including, but not limited to, the treatment of patients with NSCLC whose tumors express an altered ALK protein. We believe that TSR-011 has the potential to be effective in crizotinib-resistant cancers, potentially permitting us to pursue a rapid path to commercialization. TSR-011 is currently in preclinical development, and we plan to submit an Investigational New Drug application, or IND, during the second half of 2012. If the FDA does not object to that filing, we intend to then initiate a Phase 1 clinical trial of TSR-011.

        We in-licensed the exclusive worldwide rights to TSR-011 from Amgen, Inc. in March 2011.

Risks Associated with Our Business

        Our ability to implement our business strategy is subject to numerous risks and uncertainties. As an early stage biopharmaceutical company, we face many risks inherent in our business and our industry generally. You should carefully consider all of the information set forth in this prospectus and, in particular, the information under the heading "Risk Factors", prior to making an investment in our common stock. These risks include, among others, the following:

    we have no source of revenue, may never become profitable and may incur substantial and increasing net losses for the foreseeable future as we continue development of, seek regulatory approvals for, and begin to commercialize our product candidates;

    we may need to obtain additional funding to continue operations;

    our success is primarily dependent on the regulatory approval and commercialization of rolapitant, one of our two product candidates, because it is our only late-stage product candidate;

    we are subject to regulatory approval processes that are lengthy, time consuming and unpredictable. We may not obtain approval for one or both of our product candidates from the FDA or foreign regulatory authorities;

    it is difficult and costly to protect our intellectual property rights;

    we may be unable to recruit or retain key employees, including our senior management team; and

    we depend on the performance of third parties, including contract research organizations and third-party manufacturers.

Our Corporate Information

        We were incorporated under the laws of the State of Delaware in March 2010. Our principal executive offices are located at 1000 Winter Street, Suite 3300, Waltham, Massachusetts 02451, and our telephone number is (339) 970-0900. Our website address is www.tesarobio.com. Our website and the information contained on, or that can be accessed through, the website will not be deemed to be incorporated by reference in, and are not considered part of, this prospectus. You should not rely on any such information in making your decision whether to purchase our common stock.

        We have two trademarks, TESARO, Inc. and the TESARO, Inc. design mark. This prospectus also contains registered marks, trademarks and trade names of other companies. All trademarks, registered marks and trade names appearing in this prospectus are the property of their respective holders.

 

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The Offering

Common stock offered

              Shares

Common stock to be outstanding immediately following this offering

 

            Shares

Over-allotment option

 

Up to                Shares

Use of proceeds

 

We estimate that the net proceeds from this offering will be approximately $      million, or approximately $      million if the underwriters exercise their over-allotment option in full, assuming an initial public offering price of $        per share, which is the midpoint of the price range set forth on the cover page of this prospectus, after deducting underwriting discounts and commissions and estimated offering expenses payable by us. We expect to use the proceeds of this offering to fund the clinical development of rolapitant, to advance the development of TSR-011, to in-license or acquire, as the case may be, product candidates, technologies, compounds, other assets or complementary businesses, and for working capital and general corporate purposes. See "Use of Proceeds" for a more complete description of the intended use of proceeds from this offering.

Risk factors

 

You should read "Risk Factors" for a discussion of factors you should carefully consider before deciding to invest in our common stock.

Proposed NASDAQ Global Market symbol

 

TSRO

        The number of shares of our common stock to be outstanding immediately following this offering set forth above is based on 4,410,000 shares of our common stock outstanding as of December 31, 2011, and gives effect to (1) the issuance of 26,884,442 shares of our Series B preferred stock on March 21, 2012 and (2) the conversion of all outstanding shares of our preferred stock (including shares of our Series B preferred stock issued on March 21, 2012) into 67,936,761 shares of common stock immediately prior to the closing of this offering.

        The number of shares of our common stock to be outstanding immediately following this offering excludes:

    3,127,500 shares of our common stock issuable upon the exercise of stock options outstanding as of December 31, 2011 at a weighted-average exercise price of $0.37 per share;

                         shares of our common stock reserved for future issuance under our 2012 Omnibus Incentive Plan, or the 2012 Plan, which will become effective immediately prior to the closing of this offering, plus the number of shares of our common stock available for grant under our 2010 Stock Incentive Plan, or the 2010 Plan, as of the effectiveness of the 2012 Plan (which as of December 31, 2011 was 3,146,500), which shares will be added to the shares to be reserved under our 2012 Plan upon the effectiveness of the 2012 Plan, plus any annual increases in the number of shares of common stock reserved for future issuance under the 2012 Plan pursuant to an "evergreen provision" and any other shares that may become issuable under the 2012 Plan pursuant to its terms, as more fully described in "Executive and Director Compensation—Employee Benefit Plans—2012 Omnibus Incentive Plan;" and

 

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                         shares of our common stock reserved for future issuance under our 2012 Employee Stock Purchase Plan, or the ESPP, which will become effective immediately prior to the closing of this offering, plus any other shares that may become issuable under the ESPP pursuant to its terms, as more fully described in "Executive and Director Compensation—Employee Benefit Plans—2012 Employee Stock Purchase Plan."

        Except as otherwise indicated, the information in this prospectus assumes or gives effect to:

    no exercise by the underwriters of their over-allotment option to purchase up to                        additional shares of common stock from us;

    the conversion of all outstanding shares of our preferred stock into shares of our common stock immediately prior to the closing of this offering;

    the implementation of a    for      reverse stock split that we anticipate will occur prior to the closing of this offering; and

    the filing of our amended and restated certificate of incorporation and the adoption of our amended and restated bylaws in connection with the closing of this offering.

 

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Summary Consolidated Financial Data

        The following table sets forth a summary of our historical consolidated financial data at the dates and for the periods indicated. The summary historical financial data presented below for the year ended December 31, 2011, the period from March 26, 2010, the date of our inception, to December 31, 2010 and the period from March 26, 2010, the date of our inception, to December 31, 2011 have been derived from our audited consolidated financial statements, which are included elsewhere in this prospectus.

        The summary historical consolidated financial data presented below should be read in conjunction with "Management's Discussion and Analysis of Financial Condition and Results of Operations" and our consolidated financial statements and the related notes thereto, which are included elsewhere in this prospectus. The summary historical consolidated financial data in this section is not intended to replace our financial statements and the related notes thereto.

 
  The Period
from
March 26,
2010
(inception) to
December 31,
2010
  Year Ended
December 31,
2011
  The Period
from
March 26,
2010
(inception) to
December 31,
2011
 
 
  (in thousands, except per share amounts)
 

Expenses:

                   

Research and development

  $ 46   $ 11,768   $ 11,814  

General and administrative

    1,668     3,158     4,826  

Acquired in-process research and development

    6,630     500     7,130  
               

Total expenses

    8,344     15,426     23,770  

Loss from operations

   
(8,344

)
 
(15,426

)
 
(23,770

)

Interest income

    20     38     58  

Other loss

    (651 )   (1,010 )   (1,661 )
               

Net loss

  $ (8,975 ) $ (16,398 ) $ (25,373 )
               

Basic and diluted net loss per common share(1)

  $ (7.61 ) $ (9.12 ) $ (16.58 )
               

Basic and diluted weighted average common shares outstanding(1)

    1,179     1,799     1,530  
               

Pro forma basic and diluted net loss per common share (unaudited)(1)(2)

        $ (0.49 )      
                   

Pro forma basic and diluted weighted average common shares outstanding (unaudited)(1)(2)

          33,273        
                   

 

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  As of December 31, 2011  
 
  Actual   Pro
Forma(2)
  Pro Forma
As Adjusted(3)(4)
 
 
   
  (unaudited)
  (unaudited)
 
 
  (in thousands)
 

Balance Sheet Data:

                   

Cash and cash equivalents

  $ 39,825   $ 98,159        

Working capital

    38,835     97,169        

Total assets

    42,879     101,213        

Preferred stock

    64,348            

Total stockholders' (deficit) equity

    (25,068 )   97,614        

(1)
See Note 2 within the notes to our financial statements for a description of the method used to calculate basic and diluted net loss per common share and pro forma basic and diluted net loss per common share.

(2)
Pro forma to reflect (1) the issuance of 26,884,442 shares of our Series B preferred stock on March 21, 2012 for net proceeds of approximately $58.3 million; and (2) the conversion of all outstanding shares of our preferred stock (including shares of our Series B preferred stock issued on March 21, 2012) into 67,936,761 shares of common stock immediately prior to the closing of this offering.

(3)
Pro forma as adjusted to further reflect the sale of        shares of our common stock offered in this offering, assuming an initial public offering price of $        per share, which is the midpoint of the price range set forth on the cover page of this prospectus, after deducting underwriting discounts and commissions and estimated offering expenses payable by us.

(4)
A $1.00 increase (decrease) in the assumed initial public offering price of $        per share, which is the midpoint of the price range set forth on the cover page of this prospectus, would increase (decrease) the pro forma as adjusted amount of each of cash and cash equivalents and total stockholders' (deficit) equity by approximately $         million, assuming that the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and after deducting underwriting discounts and commissions and estimated offering expenses payable by us. An increase of        shares in the number of shares offered by us together with a concomitant $1.00 increase in the assumed initial public offering price of $        per share, which is the midpoint of the price range set forth on the cover page of this prospectus, would increase each of cash and cash equivalents and total stockholders' (deficit) equity by approximately $         million after deducting underwriting discounts and commissions and any estimated offering expenses payable by us. Conversely, a decrease of        shares in the number of shares offered by us together with a concomitant $1.00 decrease in the assumed initial public offering price of $        per share, which is the midpoint of the price range set forth on the cover page of this prospectus, would decrease each of cash and cash equivalents and total stockholders' (deficit) equity by approximately $         million after deducting underwriting discounts and commissions and any estimated offering expenses payable by us.

 

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RISK FACTORS

        Investing in our common stock involves a high degree of risk. You should carefully consider the risks described below, together with the other information contained in this prospectus, including our financial statements and the related notes appearing at the end of this prospectus, before making your decision to invest in shares of our common stock. We cannot assure you that any of the events discussed in the risk factors below will not occur. These risks could have a material and adverse impact on our business, results of operations, financial condition and cash flows. If that were to happen, the trading price of our common stock could decline, and you could lose all or part of your investment.

Risks Related to Our Financial Position and Capital Needs

We have incurred significant losses since our inception and anticipate that we will continue to incur losses in the future.

        We are a development stage biopharmaceutical company with a limited operating history. Investment in biopharmaceutical product development is highly speculative because it entails substantial upfront capital expenditures and significant risk that a product candidate will fail to gain regulatory approval or become commercially viable. As an early-stage company, we have not yet demonstrated an ability to successfully overcome many of the risks and uncertainties frequently encountered by companies in new and rapidly evolving fields, particularly in the biopharmaceutical area. We have not generated any revenue from product sales to date, and we continue to incur significant development and other expenses related to our ongoing operations. As a result, we are not profitable and have incurred losses in each period since our inception in 2010. For the year ended December 31, 2011, we reported a net loss of $16.4 million and have a deficit accumulated during the development stage of $25.4 million.

        We expect to continue to incur losses for the foreseeable future, and we expect these losses to increase as we continue our development of, and seek regulatory approvals for, our product candidates, and begin to commercialize any approved products. As such, we are subject to all of the risks incident in the development of new biopharmaceutical products, and we may encounter unforeseen expenses, difficulties, complications, delays and other unknown factors that may adversely affect our business. The size of our future net losses will depend, in part, on the rate of future growth of our expenses and our ability to generate revenues. If any of our product candidates fail in clinical trials or do not gain regulatory approval, or if approved, fail to achieve market acceptance, we may never become profitable. Even if we achieve profitability in the future, we may not be able to sustain profitability in subsequent periods. Our prior losses and expected future losses have had and will continue to have an adverse effect on our stockholders' equity and working capital.

We have a very limited operating history, which may make it difficult for you to evaluate the success of our business to date and to assess our future viability.

        We were incorporated in March 2010. Our operations to date have been limited to organizing and staffing our company, acquiring product and technology rights, and conducting product development activities for our two product candidates. We have not yet obtained regulatory approval for, or demonstrated an ability to commercialize, either of our product candidates. Consequently, any predictions about our future success, performance or viability may not be as accurate as they could be if we had a longer operating history and/or approved products on the market.

We currently have no source of revenue and may never become profitable.

        To date, we have not generated any revenues from either of the two product candidates that we have in-licensed, rolapitant and TSR-011. Our ability to generate revenue and become profitable depends upon our ability to successfully commercialize products, including either or both of our

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product candidates, or other product candidates that we may in-license or acquire in the future. Even if we are able to successfully achieve regulatory approval for either rolapitant or TSR-011, we do not know when either product will generate revenue for us, if at all. Our ability to generate revenue from our current or future product candidates also depends on a number of additional factors, including our ability to:

    successfully complete development activities, including clinical trials for rolapitant and preclinical development and clinical trials for TSR-011;

    complete and submit new drug applications, or NDAs, to the United States Food and Drug Administration, or the FDA, and obtain regulatory approval for indications for which there is a commercial market;

    complete and submit applications to, and obtain regulatory approval from, foreign regulatory authorities;

    set a commercially viable price for our products;

    obtain commercial quantities of rolapitant and TSR-011 at acceptable cost levels;

    develop a commercial organization capable of sales, marketing and distribution in our core strategic markets;

    find suitable distribution partners to help us market, sell and distribute our approved products in non-core markets; and

    obtain adequate reimbursement from third-party, including government, payors.

        In addition, because of the numerous risks and uncertainties associated with product development, including that our product candidates may not advance through development or achieve the endpoints of applicable clinical trials, we are unable to predict the timing or amount of increased expenses, or when or if we will be able to achieve or maintain profitability. Even if we are able to complete the process described above, we anticipate incurring significant costs associated with commercializing these products.

        Even if we are able to generate revenues from the sale of our products, we may not become profitable and may need to obtain additional funding to continue operations. If we fail to become profitable or are unable to sustain profitability on a continuing basis, then we may be unable to continue our operations at planned levels and be forced to reduce our operations.

If we require additional capital to fund our operations and we fail to obtain necessary financing, we may be unable to complete the development and commercialization of our product candidates.

        Our operations have consumed substantial amounts of cash since inception. We expect to continue to spend substantial amounts to advance the clinical development of our product candidates and launch and commercialize any product candidates for which we receive regulatory approval, including building our own commercial organizations to address certain markets. We believe that the net proceeds from this offering together with existing cash and cash equivalents and interest thereon will be sufficient to fund our projected operating requirements for at least the next 12 months. However, we may require additional capital for the further development and commercialization of our product candidates and may also need to raise additional funds sooner to pursue our strategy of in-licensing or acquiring additional product candidates.

        Until we can generate a sufficient amount of revenue from our products, if ever, we expect to finance future cash needs through public or private equity or debt offerings. Additional capital may not be available on reasonable terms, if at all. If we are unable to raise additional capital in sufficient amounts or on terms acceptable to us we may have to significantly delay, scale back or discontinue the

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development or commercialization of one or more of our product candidates. If we raise additional funds through the issuance of additional debt or equity securities that could result in dilution to our existing stockholders, and/or increased fixed payment obligations. Furthermore, these securities may have rights senior to those of our common stock and could contain covenants that would restrict our operations and potentially impair our competitiveness, such as limitations on our ability to incur additional debt, limitations on our ability to acquire, sell or license intellectual property rights and other operating restrictions that could adversely impact our ability to conduct our business. Any of these events could significantly harm our business, financial condition and prospects.

        Our forecast of the period of time through which our financial resources will be adequate to support our operations is a forward-looking statement and involves risks and uncertainties, and actual results could vary as a result of a number of factors, including the factors discussed elsewhere in this "Risk Factors" section. We have based this estimate on assumptions that may prove to be wrong, and we could utilize our available capital resources sooner than we currently expect. Our future funding requirements, both near and long-term, will depend on many factors, including, but not limited to:

    the initiation, progress, timing, costs and results of clinical trials for our product candidates and future product candidates we may in-license, including our Phase 3 clinical trials for rolapitant;

    the attainment of milestones and our need to make royalty payments to OPKO Health, Inc., or OPKO, Amgen, Inc., or Amgen, or any other future product candidate licensor, if any, under our in-licensing agreements;

    the number and characteristics of product candidates that we in-license and develop;

    the outcome, timing and cost of regulatory approvals by the FDA and comparable foreign regulatory authorities, including the potential for the FDA or comparable foreign regulatory authorities to require that we perform more studies than those that we currently expect;

    the cost of filing, prosecuting, defending and enforcing any patent claims and other intellectual property rights;

    the effect of competing technological and market developments;

    the cost and timing of completion of commercial-scale outsourced manufacturing activities; and

    the cost of establishing sales, marketing and distribution capabilities for rolapitant or any product candidates for which we may receive regulatory approval.

        If a lack of available capital means that we are unable to expand our operations or otherwise capitalize on our business opportunities, our business, financial condition and results of operations could be materially adversely affected.

Risks Related to Our Business and Industry

Our future success is dependent primarily on the regulatory approval and commercialization of our product candidates, including rolapitant, which is currently undergoing Phase 3 clinical trials.

        We currently do not have any products that have gained regulatory approval. The success of our business is dependent upon our ability to develop and commercialize rolapitant and TSR-011, which are currently our only product candidates. We are particularly dependent on the future success of rolapitant, because it is our only late-stage product candidate, and it is just beginning a Phase 3 clincial program. Our other product candidate, TSR-011, is still in preclinical development.

        As a result, our business is substantially dependent on our ability to complete the development of, obtain regulatory approval for, and successfully commercialize rolapitant and, to a lesser degree, TSR-011 in a timely manner. We cannot commercialize product candidates in the United States without

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first obtaining regulatory approval for the product from the FDA; similarly, we cannot commercialize product candidates outside of the United States without obtaining regulatory approval from comparable foreign regulatory authorities. Before obtaining regulatory approvals for the commercial sale of any product candidate for a target indication, we must demonstrate with substantial evidence gathered in preclinical and well-controlled clinical studies, and, with respect to approval in the United States, to the satisfaction of the FDA, that the product candidate is safe and effective for use for that target indication and that the manufacturing facilities, processes and controls are adequate. The process to develop, obtain regulatory approval for and commercialize product candidates is long, complex and costly both inside and outside of the United States. Even if rolapitant were to successfully obtain approval from the FDA and comparable foreign regulatory authorities, any approval might contain significant limitations related to use restrictions for certain age groups, warnings, precautions or contraindications, or may be subject to burdensome post-approval study or risk management requirements. If we are unable to obtain regulatory approval for rolapitant in one or more jurisdictions, or any approval contains significant limitations, we may not be able to obtain sufficient funding or generate sufficient revenue to continue the development of TSR-011 or any other product candidate that we may in-license or acquire in the future. Furthermore, even if we obtain approval for rolapitant from the FDA and comparable foreign regulatory authorities, we will still need to develop a commercial organization, establish commercially viable pricing and obtain approval for adequate reimbursement from third party and government payors. If we are unable to successfully commercialize rolapitant, we may not be able to earn sufficient revenues to continue our business.

Because the results of preclinical testing or earlier clinical studies are not necessarily predictive of future results, rolapitant, which is currently in Phase 3 clinical trials, or any other product candidate we advance into clinical trials may not have favorable results in later clinical trials or receive regulatory approval.

        Success in preclinical testing and early clinical studies does not ensure that later clinical trials will generate adequate data to demonstrate the efficacy and safety of an investigational drug. A number of companies in the pharmaceutical and biotechnology industries, including those with greater resources and experience, have suffered significant setbacks in clinical trials, even after seeing promising results in earlier clinical trials. Despite the results reported in earlier clinical trials for rolapitant and in preclinical studies for TSR-011, we do not know whether the clinical trials we may conduct will demonstrate adequate efficacy and safety to result in regulatory approval to market in any particular jurisdiction or jurisdictions any of our product candidates. If later-stage clinical trials do not produce favorable results, our ability to achieve regulatory approval for any of our product candidates may be adversely impacted.

Clinical drug development involves a lengthy and expensive process with an uncertain outcome, and results of earlier studies and trials may not be predictive of future trial results.

        Clinical testing is expensive and can take many years to complete, and its outcome is inherently uncertain. Failure can occur at any time during the clinical trial process. The results of preclinical studies and early clinical trials of our product candidates may not be predictive of the results of later-stage clinical trials. Product candidates in later stages of clinical trials may fail to show the desired safety and efficacy traits despite having progressed through preclinical studies and initial clinical trials. A number of companies in the biopharmaceutical industry have suffered significant setbacks in advanced clinical trials due to lack of efficacy or adverse safety profiles, notwithstanding promising results in earlier trials. Our future clinical trial results may not be successful.

        Although we have clinical trials ongoing for rolapitant, and although we are planning to initiate clinical trials for TSR-011 in the second half of 2012, we may experience delays in our ongoing clinical trials and we do not know whether planned clinical trials will begin or enroll subjects on time, need to

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be redesigned or be completed on schedule, if at all. Clinical trials may be delayed, suspended or prematurely terminated for a variety of reasons, such as:

    delay or failure in reaching agreement with the FDA or comparable foreign regulatory authority on a trial design that we are able to execute;

    delay or failure in obtaining authorization to commence a trial or inability to comply with conditions imposed by a regulatory authority regarding the scope or design of a clinical study;

    delay or failure in reaching agreement on acceptable terms with prospective contract research organizations, or CROs, and clinical trial sites, the terms of which can be subject to extensive negotiation and may vary significantly among different CROs and trial sites;

    delay or failure in obtaining institutional review board, or IRB, approval or the approval of other reviewing entities, including comparable foreign regulatory authorities, to conduct a clinical trial at each site;

    withdrawal of clinical trial sites from our clinical trials as a result of changing standards of care or the ineligibility of a site to participate in our clinical trials;

    delay or failure in recruiting and enrolling suitable subjects to participate in a trial;

    delay or failure in having subjects complete a trial or return for post-treatment follow-up;

    clinical sites and investigators deviating from trial protocol, failing to conduct the trial in accordance with regulatory requirements, or dropping out of a trial;

    inability to identify and maintain a sufficient number of trial sites, many of which may already be engaged in other clinical trial programs, including some that may be for the same indication;

    failure of our third-party clinical trial managers to satisfy their contractual duties or meet expected deadlines;

    delay or failure in adding new clinical trial sites;

    ambiguous or negative interim results, or results that are inconsistent with earlier results;

    feedback from the FDA, the IRB, data safety monitoring boards, or a comparable foreign regulatory authority, or results from earlier stage or concurrent preclinical and clinical studies, that might require modification to the protocol;

    decision by the FDA, the IRB, a comparable foreign regulatory authority, or the company, or recommendation by a data safety monitoring board or comparable foreign regulatory authority, to suspend or terminate clinical trials at any time for safety issues or for any other reason;

    unacceptable risk-benefit profile or unforeseen safety issues or adverse side effects;

    failure to demonstrate a benefit from using a drug;

    manufacturing, including manufacturing or obtaining from third parties sufficient quantities of a product candidate for use in clinical trials; or

    changes in governmental regulations or administrative actions or lack of adequate funding to continue the clinical trial.

        Patient enrollment, a significant factor in the timing of clinical trials, is affected by many factors including the size and nature of the patient population, the proximity of subjects to clinical sites, the eligibility criteria for the trial, the design of the clinical trial, inability to obtain and maintain patient consents, risk that enrolled subjects will drop out before completion, competing clinical trials and clinicians' and patients' perceptions as to the potential advantages of the drug being studied in relation

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to other available therapies, including any new drugs that may be approved for the indications we are investigating. Furthermore, we rely on CROs and clinical trial sites to ensure the proper and timely conduct of our clinical trials and while we have agreements governing their committed activities, we have limited influence over their actual performance.

        If we experience delays in the completion of, or termination of, any clinical trial of our product candidates, the commercial prospects of our product candidates will be harmed, and our ability to generate product revenues from any of these product candidates will be delayed. In addition, any delays in completing our clinical trials will increase our costs, slow down our product candidate development and approval process and jeopardize our ability to commence product sales and generate revenues. Any of these occurrences may harm our business, financial condition and prospects significantly. In addition, many of the factors that cause, or lead to, a delay in the commencement or completion of clinical trials may also ultimately lead to the denial of regulatory approval of our product candidates.

The regulatory approval processes of the FDA and comparable foreign regulatory authorities are lengthy, time consuming and inherently unpredictable, and if we are ultimately unable to obtain regulatory approval for our product candidates, our business will be substantially harmed.

        The time required to obtain approval by the FDA and comparable foreign regulatory authorities is unpredictable but typically takes many years following the commencement of preclinical studies and clinical trials and depends upon numerous factors, including the substantial discretion of the regulatory authorities. In addition, approval policies, regulations, or the type and amount of clinical data necessary to gain approval may change during the course of a product candidate's clinical development and may vary among jurisdictions. We have not obtained regulatory approval for any product candidate and it is possible that none of our existing product candidates or any product candidates we may in-license or acquire and seek to develop in the future will ever obtain regulatory approval.

        Our product candidates could fail to receive regulatory approval from the FDA or a comparable foreign regulatory authority for many reasons, including:

    disagreement with the design or implementation of our clinical trials;

    failure to demonstrate that a product candidate is safe and effective for its proposed indication;

    failure of clinical trials to meet the level of statistical significance required for approval;

    failure to demonstrate that a product candidate's clinical and other benefits outweigh its safety risks;

    disagreement with our interpretation of data from preclinical studies or clinical trials;

    the insufficiency of data collected from clinical trials of our product candidates to support the submission and filing of an NDA or other submission or to obtain regulatory approval;

    disapproval of the manufacturing processes or facilities of third-party manufacturers with whom we contract for clinical and commercial supplies; or

    changes in the approval policies or regulations that render our preclinical and clinical data insufficient for approval.

        The FDA or a comparable foreign regulatory authority may require more information, including additional preclinical or clinical data to support approval, which may delay or prevent approval and our commercialization plans, or we may decide to abandon the development program. If we were to obtain approval, regulatory authorities may approve any of our product candidates for fewer or more limited indications than we request, may grant approval contingent on the performance of costly post-marketing clinical trials, or may approve a product candidate with a label that does not include the labeling claims necessary or desirable for the successful commercialization of that product candidate. In

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addition, if our product candidate produces undesirable side effects or safety issues, the FDA may require the establishment of Risk Evaluation Mitigation Strategies, or REMS, or a comparable foreign regulatory authority may require the establishment of a similar strategy, that may, for instance, restrict distribution of our products and impose burdensome implementation requirements on us. Any of the foregoing scenarios could materially harm the commercial prospects for our product candidates.

Our product candidates may cause undesirable side effects or have other properties that could delay or prevent their regulatory approval, limit the commercial profile of an approved label, or result in significant negative consequences following any marketing approval.

        Undesirable side effects caused by our product candidates could cause us or regulatory authorities to interrupt, delay or halt clinical trials and could result in a more restrictive label or the delay or denial of regulatory approval by the FDA or other comparable foreign regulatory authority. Results of our trials could reveal a high and unacceptable severity and prevalence of side effects. In such an event, our trials could be suspended or terminated and the FDA or comparable foreign regulatory authorities could order us to cease further development of or deny approval of our product candidates for any or all targeted indications. The drug-related side effects could affect patient recruitment or the ability of enrolled subjects to complete the trial or result in potential product liability claims. Any of these occurrences may harm our business, financial condition and prospects significantly.

        Additionally if one or more of our product candidates receives marketing approval, and we or others later identify undesirable side effects caused by such products, a number of potentially significant negative consequences could result, including:

    we may suspend marketing of such product;

    regulatory authorities may withdraw approvals of such product;

    regulatory authorities may require additional warnings on the label;

    we may be required to develop a REMS for each product or, if a REMS is already in place, to incorporate additional requirements under the REMS, or to develop a similar strategy as required by a comparable foreign regulatory authority;

    we may be required to conduct post-market studies;

    we could be sued and held liable for harm caused to subjects or patients; and

    our reputation may suffer.

        Any of these events could prevent us from achieving or maintaining market acceptance of the particular product candidate, if approved, and could significantly harm our business, results of operations and prospects.

Even if our product candidates receive regulatory approval, they may still face future development and regulatory difficulties.

        Even if we obtain regulatory approval for a product candidate, it would be subject to ongoing requirements by the FDA and comparable foreign regulatory authorities governing the manufacture, quality control, further development, labeling, packaging, storage, distribution, safety surveillance, import, export, advertising, promotion, recordkeeping and reporting of safety and other post-market information. The safety profile of any product will continue to be closely monitored by the FDA and comparable foreign regulatory authorities after approval. If the FDA or comparable foreign regulatory authorities become aware of new safety information after approval of any of our product candidates, regulatory authorities, may require labeling changes or establishment of a REMS or similar strategy, impose significant restrictions on a product's indicated uses or marketing, or impose ongoing requirements for potentially costly post-approval studies or post-market surveillance. For example, the label ultimately approved for rolapitant, if any, may include restrictions on use.

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        In addition, manufacturers of drug products and their facilities are subject to continual review and periodic inspections by the FDA and other regulatory authorities for compliance with current good manufacturing practices, or cGMP, regulations. If we or a regulatory agency discover previously unknown problems with a product, such as adverse events of unanticipated severity or frequency, or problems with the facility where the product is manufactured, a regulatory agency may impose restrictions on that product, the manufacturing facility or us, including requiring recall or withdrawal of the product from the market or suspension of manufacturing. If we, our product candidates or the manufacturing facilities for our product candidates fail to comply with applicable regulatory requirements, a regulatory agency may:

    issue warning letters or untitled letters;

    mandate modifications to promotional materials or require us to provide corrective information to healthcare practitioners;

    require us to enter into a consent decree, which can include imposition of various fines, reimbursements for inspection costs, required due dates for specific actions and penalties for noncompliance;

    seek an injunction or impose civil or criminal penalties or monetary fines;

    suspend or withdraw regulatory approval;

    suspend any ongoing clinical studies;

    refuse to approve pending applications or supplements to applications filed by us;

    suspend or impose restrictions on operations, including costly new manufacturing requirements; or

    seize or detain products, refuse to permit the import or export of products, or require us to initiate a product recall.

        The occurrence of any event or penalty described above may inhibit our ability to commercialize our products and generate revenue.

        Advertising and promotion of any product candidate that obtains approval in the United States will be heavily scrutinized by the FDA, the Department of Justice, the Department of Health and Human Services' Office of Inspector General, state attorneys general, members of Congress, and the public. Violations, including promotion of our products for unapproved (or off-label) uses, are subject to enforcement letters, inquiries and investigations, and civil and criminal sanctions by the FDA. Additionally, advertising and promotion of any product candidate that obtains approval outside of the United States will be heavily scrutinized by comparable foreign regulatory authorities.

        In the United States, engaging in impermissible promotion of our products for off-label uses can also subject us to false claims litigation under federal and state statutes, which can lead to civil and criminal penalties and fines and agreements that materially restrict the manner in which a company promotes or distributes drug products. These false claims statutes include the federal False Claims Act, which allows any individual to bring a lawsuit against a pharmaceutical company on behalf of the federal government alleging submission of false or fraudulent claims, or causing to present such false or fraudulent claims, for payment by a federal program such as Medicare or Medicaid. If the government prevails in the lawsuit, the individual will share in any fines or settlement funds. Since 2004, these False Claims Act lawsuits against pharmaceutical companies have increased significantly in volume and breadth, leading to several substantial civil and criminal settlements based on certain sales practices promoting off-label drug uses. For instance, in 2009, Pfizer, Inc. paid $2.3 billion to settle civil and criminal allegations for illegally marketing four products. This growth in litigation has increased the risk that a pharmaceutical company will have to defend a false claim action, pay settlement fines or

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restitution, agree to comply with burdensome reporting and compliance obligations, and be excluded from the Medicare, Medicaid, and other federal and state healthcare programs. If we do not lawfully promote our approved products, we may become subject to such litigation and, if we are not successful in defending against such actions, those actions may have a material adverse effect on our business, financial condition and results of operations.

Failure to obtain regulatory approval for the intravenous formulation of rolapitant could limit our commercial success.

        Our clinical development efforts are currently focused on an oral formulation of rolapitant. However, we are also developing an intravenous, or IV, formulation. If we are successful in obtaining regulatory approval of the oral formulation, we would expect the FDA to require an NDA for approval of an IV formulation. Even if the oral formulation gains regulatory approval, there can be no assurance that we would be able to obtain regulatory approval of the IV formulation. To support an NDA for the IV formulation, we will have to provide clinical data specific to the IV formulation. If the clinical results of the IV formulation are positive, we estimate that it would take approximately one year following the submission of the oral form NDA for the FDA to approve the IV formulation, although our submission or FDA review could take significantly longer. We expect the IV formulation of rolapitant to serve what we expect is a larger portion of the market for NK-1 receptor antagonists and generate more revenue compared to the oral formulation. If we do not obtain regulatory approval for the IV formulation, that would negatively affect our revenue and growth prospects.

If we are unable to establish sales and marketing capabilities or enter into agreements with third parties to market and sell our product candidates, we may be unable to generate any revenue.

        We do not currently have an organization for the sales, marketing and distribution of pharmaceutical products and the cost of establishing and maintaining such an organization may exceed the cost-effectiveness of doing so. In order to market any products that may be approved by the FDA and comparable foreign regulatory authorities, we must build our sales, marketing, managerial and other non-technical capabilities or make arrangements with third parties to perform these services. If we are unable to establish adequate sales, marketing and distribution capabilities, whether independently or with third parties, we may not be able to generate product revenue and may not become profitable. We will be competing with many companies that currently have extensive and well-funded sales and marketing operations. Without an internal commercial organization or the support of a third party to perform sales and marketing functions, we may be unable to compete successfully against these more established companies.

Failure to obtain regulatory approval in international jurisdictions would prevent our product candidates from being marketed abroad.

        In order to market and sell our products in the European Union and many other jurisdictions, including China, we must obtain separate marketing approvals and comply with numerous and varying regulatory requirements. The approval procedure varies among countries and can involve additional testing. The time required to obtain approval may differ substantially from that required to obtain FDA approval. The regulatory approval process outside the United States generally includes all of the risks associated with obtaining FDA approval. In addition, in many countries outside the United States, it is required that the product be approved for reimbursement before the product can be approved for sale in that country. We may not obtain approvals from regulatory authorities outside the United States on a timely basis, if at all. Approval by the FDA does not ensure approval by regulatory authorities in other countries or jurisdictions, and approval by one regulatory authority outside the United States does not ensure approval by regulatory authorities in other countries or jurisdictions or by the FDA. We may not be able to file for marketing approvals and may not receive necessary approvals to

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commercialize our products in any market. If we are unable to obtain approval of any of our product candidates by regulatory authorities in the European Union, China or another country, the commercial prospects of that product candidate may be significantly diminished and our business prospects could decline.

We face substantial competition, which may result in others discovering, developing or commercializing products before or more successfully than we do.

        The development and commercialization of new drug products is highly competitive. We face competition with respect to our current product candidates, and will face competition with respect to any product candidates that we may seek to develop or commercialize in the future, from major pharmaceutical companies, specialty pharmaceutical companies and biotechnology companies worldwide. There are a number of large pharmaceutical and biotechnology companies that currently market and sell products or are pursuing the development of products for the treatment of the disease indications for which we are developing our product candidates. Some of these competitive products and therapies are based on scientific approaches that are the same as or similar to our approach, and others are based on entirely different approaches. Potential competitors also include academic institutions, government agencies and other public and private research organizations that conduct research, seek patent protection and establish collaborative arrangements for research, development, manufacturing and commercialization.

        Our product candidates are being developed for cancer therapeutics and oncology supportive care. There are a variety of available therapies and supportive care products marketed for cancer patients. In many cases, these drugs are administered in combination to enhance efficacy or to reduce side effects. Some of these drugs are branded and subject to patent protection, and others are available on a generic basis. Many of these approved drugs are well established therapies or products and are widely accepted by physicians, patients and third-party payors. Insurers and other third-party payors may also encourage the use of generic products. We expect that if our product candidates are approved, they will be priced at a significant premium over competitive generic products. This may make it difficult for us to achieve our business strategy of using our product candidates in combination with existing therapies or replacing existing therapies with our product candidates.

        More established companies may have a competitive advantage over us due to their greater size, cash flows and institutional experience. Compared to us, many of our competitors may have significantly greater financial, technical and human resources.

        As a result of these factors, our competitors may obtain regulatory approval of their products more rapidly than we are able to or may obtain patent protection or other intellectual property rights that limit our ability to develop or commercialize our product candidates. Our competitors may also develop drugs that are more effective, more widely used and less costly than ours, and may also be more successful than us in manufacturing and marketing their products.

        Mergers and acquisitions in the pharmaceutical and biotechnology industries may result in even more resources being concentrated among a smaller number of our competitors. Smaller and other early-stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established companies. These third parties compete with us in recruiting and retaining qualified scientific, management and commercial personnel, establishing clinical trial sites and patient registration for clinical trials, as well as in acquiring technologies complementary to, or necessary for, our programs.

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Even if we are able to commercialize our product candidates, the products may become subject to unfavorable pricing regulations, third-party reimbursement practices or healthcare reform initiatives, which could harm our business.

        The regulations that govern marketing approvals, pricing and reimbursement for new drug products vary widely from country to country. In the United States, recently passed legislation may significantly change the approval requirements in ways that could involve additional costs and cause delays in obtaining approvals. Some countries require approval of the sale price of a drug before it can be marketed. In many countries, the pricing review period begins after marketing or product licensing approval is granted. In some foreign markets, prescription pharmaceutical pricing remains subject to continuing governmental control even after initial approval is granted. As a result, we might obtain marketing approval for a product in a particular country, but then be subject to price regulations that delay our commercial launch of the product, possibly for lengthy time periods, which could negatively impact the revenues we are able to generate from the sale of the product in that particular country. Adverse pricing limitations may hinder our ability to recoup our investment in one or more product candidates even if our product candidates obtain marketing approval.

        Our ability to commercialize any products successfully will also depend in part on the extent to which coverage and reimbursement for these products and related treatments will be available from government health administration authorities, private health insurers and other organizations. Government authorities and third-party payors, such as private health insurers and health maintenance organizations, determine which medications they will cover and establish reimbursement levels. A primary trend in the U.S. healthcare industry and elsewhere is cost containment. Government authorities and third-party payors have attempted to control costs by limiting coverage and the amount of reimbursement for particular medications. Increasingly, third-party payors are requiring that drug companies provide them with predetermined discounts from list prices and are challenging the prices charged for medical products. We cannot be sure that coverage and reimbursement will be available for any product that we commercialize and, if reimbursement is available, what the level of reimbursement will be. Coverage and reimbursement may impact the demand for, or the price of, any product candidate for which we obtain marketing approval. If reimbursement is not available or is available only to limited levels, we may not be able to successfully commercialize any product candidate for which we obtain marketing approval.

        There may be significant delays in obtaining coverage and reimbursement for newly approved drugs, and coverage may be more limited than the purposes for which the drug is approved by the FDA or comparable foreign regulatory authorities. Moreover, eligibility for coverage and reimbursement does not imply that any drug will be paid for in all cases or at a rate that covers our costs, including research, development, manufacture, sale and distribution. Interim reimbursement levels for new drugs, if applicable, may also not be sufficient to cover our costs and may only be temporary. Reimbursement rates may vary according to the use of the drug and the clinical setting in which it is used, may be based on reimbursement levels already set for lower cost drugs and may be incorporated into existing payments for other services. Net prices for drugs may be reduced by mandatory discounts or rebates required by government healthcare programs or private payors and by any future relaxation of laws that presently restrict imports of drugs from countries where they may be sold at lower prices than in the United States. Third-party payors often rely upon Medicare coverage policy and payment limitations in setting their own reimbursement policies. Our inability to promptly obtain coverage and profitable reimbursement rates from both government-funded and private payors for any approved products that we develop could have a material adverse effect on our operating results, our ability to raise capital needed to commercialize products and our overall financial condition.

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Recently enacted and future legislation may increase the difficulty and cost for us to obtain marketing approval of and commercialize our product candidates and affect the prices we may obtain.

        In the United States and some foreign jurisdictions, there have been a number of legislative and regulatory changes and proposed changes regarding the healthcare system that could prevent or delay marketing approval of our product candidates, restrict or regulate post-approval activities and affect our ability to profitably sell any product candidates for which we obtain marketing approval.

        In the United States, the Medicare Prescription Drug, Improvement, and Modernization Act of 2003, or Medicare Modernization Act, changed the way Medicare covers and pays for pharmaceutical products. The legislation expanded Medicare coverage for drug purchases by the elderly and introduced a new reimbursement methodology based on average sales prices for physician administered drugs. In addition, this legislation provided authority for limiting the number of drugs that will be covered in any therapeutic class. Cost reduction initiatives and other provisions of this legislation could decrease the coverage and price that we receive for any approved products. While the Medicare Modernization Act applies only to drug benefits for Medicare beneficiaries, private payors often follow Medicare coverage policy and payment limitations in setting their own reimbursement rates. Therefore, any reduction in reimbursement that results from the Medicare Modernization Act may result in a similar reduction in payments from private payors.

        In March 2010, President Obama signed into law the Affordable Care Act, a sweeping law intended to broaden access to health insurance, reduce or constrain the growth of healthcare spending, enhance remedies against fraud and abuse, add new transparency requirements for healthcare and health insurance industries, impose new taxes and fees on pharmaceutical and medical device manufacturers and impose additional health policy reforms. The Affordable Care Act revises the definition of "average manufacturer price" for reporting purposes, which could increase the amount of Medicaid drug rebates to states. Further, the new law imposes a significant annual fee on companies that manufacture or import branded prescription drug products. Substantial new provisions affecting compliance have also been enacted, which may affect our business practices with healthcare practitioners. A number of state governors have strenuously opposed certain of the Affordable Care Act's provisions, and initiated lawsuits challenging its constitutionality. These challenges are pending final adjudication in several jurisdictions, including the United States Supreme Court. Congress has also proposed a number of legislative initiatives, including possible repeal of the Affordable Care Act. Although it is too early to determine the effect of the Affordable Care Act, the new law appears likely to continue the pressure on pharmaceutical pricing, especially under the Medicare program, and may also increase our regulatory burdens and operating costs.

        In addition, other legislative changes have been proposed and adopted since the Affordable Care Act was enacted. Most recently, on August 2, 2011, the President signed into law the Budget Control Act of 2011, which, among other things, creates the Joint Select Committee on Deficit Reduction to recommend to Congress proposals in spending reductions. The Joint Select Committee did not achieve a targeted deficit reduction of at least $1.2 trillion for the years 2013 through 2021, triggering the legislation's automatic reduction to several government programs. This includes aggregate reductions to Medicare payments to providers of up to 2% per fiscal year, starting in 2013. Legislative and regulatory proposals have been made to expand post-approval requirements and restrict sales and promotional activities for pharmaceutical products. We cannot be sure whether additional legislative changes will be enacted, or whether the FDA regulations, guidance or interpretations will be changed, or what the impact of such changes on the marketing approvals of our product candidates, if any, may be.

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If we breach the license agreements for our product candidates, we could lose the ability to continue the development and commercialization of our product candidates.

        In December 2010, we entered into a license agreement with OPKO to obtain exclusive worldwide rights to research, develop, manufacture, market and sell rolapitant. In March 2011, we entered into a license agreement with Amgen to obtain exclusive worldwide rights to research, develop, manufacture, market and sell an anaplastic lymphoma kinase, or ALK, inhibitor product. These agreements require us to use commercially reasonable efforts to develop and commercialize such products in accordance with such agreements, and to make timely milestone, royalty and other payments, provide certain information regarding our activities with respect to such products, maintain the confidentiality of information we receive from Amgen and OPKO, and indemnify OPKO and Amgen with respect to our development and commercialization activities under the terms of the agreements.

        If we fail to meet these obligations, our licensors have the right to terminate our exclusive licenses and upon the effective date of such termination, have the right to re-obtain the licensed technology as well as aspects of any intellectual property controlled by us and developed during the period the agreements were in force that relate to the licensed technology. This means that our licensors could effectively take control of the development and commercialization of our product candidates after an uncured, material breach of our license agreements by us. This would also be the case if we voluntarily terminate the agreements. While we would expect to exercise all rights and remedies available to us, including seeking to cure any breach by us, and otherwise seek to preserve our rights under the patents licensed to us, we may not be able to do so in a timely manner, at an acceptable cost or at all. Any uncured, material breach under the licenses could result in our loss of exclusive rights and may lead to a complete termination of our product development and any commercialization efforts for the applicable product candidate.

We may not be successful in obtaining necessary rights to product candidates for our development pipeline through acquisitions and in-licenses.

        We do not intend to develop product candidates from our own original research. Our business model is predicated, in part, on our ability to successfully identify and acquire or in-license product candidates for the treatment and support of cancer patients. However, we may be unable to acquire or in-license any product candidates from third parties, including because we are focusing on a specific area of care and we may be unable to identify product candidates that we believe are an appropriate strategic fit for our company.

        The in-licensing and acquisition of product candidates is a competitive area, and a number of more established companies are also pursuing strategies to in-license or acquire product candidates that we may consider attractive. These established companies may have a competitive advantage over us due to their size, cash resources and greater clinical development and commercialization capabilities. Furthermore, companies that perceive us to be a competitor may be unwilling to assign or license rights to us. We also may be unable to in-license or acquire the relevant product candidate on terms that would allow us to make an appropriate return on our investment.

        In addition, we expect that competition for the in-licensing or acquisition of product candidates that are attractive to us may increase in the future, which may mean fewer suitable opportunities for us as well as higher acquisition or licensing prices. If we are unable to successfully obtain rights to suitable product candidates, our business, financial condition and prospects for growth could suffer.

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Product liability lawsuits against us could cause us to incur substantial liabilities and to limit commercialization of any products that we may develop.

        We face an inherent risk of product liability exposure related to the testing of our product candidates in human clinical trials and will face an even greater risk if we commercially sell any products that we may develop. Product liability claims may be brought against us by subjects enrolled in our clinical trials, patients, healthcare providers or others using, administering or selling our products. If we cannot successfully defend ourselves against claims that our product candidates or products caused injuries, we could incur substantial liabilities. Regardless of merit or eventual outcome, liability claims may result in:

    decreased demand for any product candidates or products that we may develop;

    termination of clinical trial sites or entire trial programs;

    injury to our reputation and significant negative media attention;

    withdrawal of clinical trial participants;

    significant costs to defend the related litigation;

    substantial monetary awards to trial subjects or patients;

    loss of revenue;

    diversion of management and scientific resources from our business operations; and

    the inability to commercialize any products that we may develop.

        We currently hold $10 million in product liability insurance coverage in the aggregate, which may not be adequate to cover all liabilities that we may incur. We expect to increase our insurance coverage when we begin to commercialize our product candidates, if ever. Insurance coverage is increasingly expensive. We may not be able to maintain insurance coverage at a reasonable cost or in an amount adequate to satisfy any liability that may arise. We intend to expand our insurance coverage for products to include the sale of commercial products if we obtain marketing approval for our product candidates in development, but we may be unable to obtain commercially reasonable product liability insurance for any products approved for marketing. Large judgments have been awarded in class action lawsuits based on drugs that had unanticipated side effects. A successful product liability claim or series of claims brought against us, particularly if judgments exceed our insurance coverage, could decrease our cash and adversely affect our business.

We intend to market our products outside of the United States, and we will be subject to the risks of doing business outside of the United States.

        Because we intend to market products, if approved, outside of the United States, our business is subject to risks associated with doing business outside of the United States. Accordingly, our business and financial results in the future could be adversely affected due to a variety of factors, including:

    efforts to develop an international sales, marketing and distribution organization may increase our expenses, divert our management's attention from the acquisition or development of product candidates or cause us to forgo profitable licensing opportunities in these geographies;

    changes in a specific country's or region's political and cultural climate or economic condition;

    unexpected changes in foreign laws and regulatory requirements;

    difficulty of effective enforcement of contractual provisions in local jurisdictions;

    inadequate intellectual property protection in foreign countries;

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    trade-protection measures, import or export licensing requirements such as Export Administration Regulations promulgated by the United States Department of Commerce and fines, penalties or suspension or revocation of export privileges;

    the effects of applicable foreign tax structures and potentially adverse tax consequences; and

    significant adverse changes in foreign currency exchange rates.

Our relationships with customers and third-party payors will be subject to applicable anti-kickback, fraud and abuse and other healthcare laws and regulations, which could expose us to criminal sanctions, civil penalties, contractual damages, reputational harm and diminished profits and future earnings.

        Healthcare providers, physicians and third-party payors play a primary role in the recommendation and prescription of any product candidates for which we obtain marketing approval. Our future arrangements with third-party payors and customers may expose us to broadly applicable fraud and abuse and other healthcare laws and regulations that may constrain the business or financial arrangements and relationships through which we market, sell and distribute our products for which we obtain marketing approval. Restrictions under applicable federal and state healthcare laws and regulations, include the following:

    the federal healthcare anti-kickback statute prohibits, among other things, persons from knowingly and willfully soliciting, offering, receiving or providing remuneration, directly or indirectly, in cash or in kind, to induce or reward either the referral of an individual for, or the purchase, order or recommendation of, any good or service, for which payment may be made under federal and state healthcare programs such as Medicare and Medicaid;

    the federal False Claims Act imposes criminal and civil penalties, including through civil whistleblower or qui tam actions, against individuals or entities for knowingly presenting, or causing to be presented, to the federal government, claims for payment that are false or fraudulent or making a false statement to avoid, decrease or conceal an obligation to pay money to the federal government;

    the federal Health Insurance Portability and Accountability Act of 1996, as amended by the Health Information Technology for Economic and Clinical Health Act, or HIPAA, imposes criminal and civil liability for executing a scheme to defraud any healthcare benefit program and also imposes obligations, including mandatory contractual terms, with respect to safeguarding the privacy, security and transmission of individually identifiable health information;

    HIPAA also created federal criminal laws that prohibit knowingly and willfully falsifying, concealing or covering up a material fact or making any materially false statement in connection with the delivery of or payment for healthcare benefits, items or services;

    the federal physician sunshine requirements under the Affordable Care Act requires manufacturers of drugs, devices, biologics and medical supplies to report to the Department of Health and Human Services information related to physician payments and other transfers of value and physician ownership and investment interests; and

    analogous state laws and regulations, such as state anti-kickback and false claims laws, may apply to sales or marketing arrangements and claims involving healthcare items or services reimbursed by non-governmental third-party payors, including private insurers, and some state laws require pharmaceutical companies to comply with the pharmaceutical industry's voluntary compliance guidelines and the relevant compliance guidance promulgated by the federal government in addition to requiring drug manufacturers to report information related to payments to physicians and other healthcare providers or marketing expenditures.

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        Efforts to ensure that our business arrangements with third parties will comply with applicable healthcare laws and regulations will involve substantial costs. It is possible that governmental authorities will conclude that our business practices may not comply with current or future statutes, regulations or case law involving applicable fraud and abuse or other healthcare laws and regulations. If our operations are found to be in violation of any of these laws or any other governmental regulations that may apply to us, we may be subject to significant civil, criminal and administrative penalties, damages, fines, exclusion from government funded healthcare programs, such as Medicare and Medicaid, and the curtailment or restructuring of our operations. If any of the physicians or other providers or entities with whom we expect to do business are found to not be in compliance with applicable laws, they may be subject to criminal, civil or administrative sanctions, including exclusions from government funded healthcare programs.

Our employees may engage in misconduct or other improper activities, including noncompliance with regulatory standards and requirements, which could have a material adverse effect on our business.

        We are exposed to the risk of employee fraud or other misconduct. Misconduct by employees could include intentional failures to comply with FDA regulations or similar regulations of comparable foreign regulatory authorities, provide accurate information to the FDA or comparable foreign regulatory authorities, comply with manufacturing standards we have established, comply with federal and state healthcare fraud and abuse laws and regulations and similar laws and regulations established and enforced by comparable foreign regulatory authorities, report financial information or data accurately or disclose unauthorized activities to us. In particular, sales, marketing and business arrangements in the healthcare industry are subject to extensive laws and regulations intended to prevent fraud, kickbacks, self-dealing and other abusive practices. These laws and regulations may restrict or prohibit a wide range of pricing, discounting, marketing and promotion, sales commission, customer incentive programs and other business arrangements. Employee misconduct could also involve the improper use of information obtained in the course of clinical trials, which could result in regulatory sanctions and serious harm to our reputation. We have adopted a Code of Business Conduct and Ethics, which will be effective as of the closing of this offering, but it is not always possible to identify and deter employee misconduct, and the precautions we take to detect and prevent this activity may not be effective in controlling unknown or unmanaged risks or losses or in protecting us from governmental investigations or other actions or lawsuits stemming from a failure to be in compliance with such laws or regulations. If any such actions are instituted against us, and we are not successful in defending ourselves or asserting our rights, those actions could have a significant impact on our business and results of operations, including the imposition of significant fines or other sanctions.

We will need to grow the size of our organization, and we may experience difficulties in managing this growth.

        As of March 1, 2012, we had 18 full-time employees. As our development and commercialization plans and strategies develop, or as a result of any in-licenses or acquisitions, we will need additional managerial, operational, sales, marketing, financial and other resources. Our management, personnel and systems currently in place may not be adequate to support this future growth. Future growth would impose significant added responsibilities on members of management, including:

    managing our clinical trials effectively;

    identifying, recruiting, maintaining, motivating and integrating additional employees;

    managing our internal development efforts effectively while complying with our contractual obligations to licensors, licensees, contractors and other third parties;

    improving our managerial, development, operational and finance systems; and

    expanding our facilities.

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        As our operations expand, we will need to manage additional relationships with various strategic partners, suppliers and other third parties. Our future financial performance and our ability to commercialize our product candidates and to compete effectively will depend, in part, on our ability to manage any future growth effectively. To that end, we must be able to manage our development efforts and clinical trials effectively and hire, train and integrate additional management, administrative and sales and marketing personnel. We may not be able to accomplish these tasks, and our failure to accomplish any of them could prevent us from successfully growing our company.

If we are unable to attract and retain highly qualified employees, we may not be able to grow effectively.

        Our future growth and success depend on our ability to recruit, retain, manage and motivate our employees. The loss of the services of any member of our senior management team or the inability to hire or retain experienced management personnel could adversely affect our ability to execute our business plan and harm our operating results.

        Because of the specialized scientific and managerial nature of our business, we rely heavily on our ability to attract and retain qualified scientific, technical and managerial personnel. Our ability to compete and grow depends in a large part upon the continued service of our senior management team. In particular, the loss of one or more of our senior executive officers could be detrimental to us if we cannot recruit suitable replacements in a timely manner. The competition for qualified personnel in the pharmaceutical field is intense and as a result, we may be unable to continue to attract and retain qualified personnel necessary for the development of our business or to recruit suitable replacement personnel.

Our future success depends on our ability to retain our executive officers and to attract, retain and motivate qualified personnel.

        We are highly dependent on Leon O. Moulder, Jr., our Chief Executive Officer, Mary Lynne Hedley, our President and Chief Scientific Officer, and Richard J. Rodgers, our Executive Vice President and Chief Financial Officer. Although we have offer letter agreements with Mr. Moulder, Dr. Hedley and Mr. Rodgers, these agreements are at-will and do not prevent them from terminating their employment with us at any time. We do not maintain "key person" insurance for any of our executives or other employees. The loss of the services of any of these persons could impede the achievement of our research, development and commercialization objectives.

In addition to in-licensing or acquiring product candidates, we may engage in future acquisitions that could disrupt our business, cause dilution to our stockholders and harm our financial condition and operating results.

        While we currently have no specific plans to acquire any other businesses, we have, from time to time, evaluated acquisition opportunities and may, in the future, make acquisitions of, or investments in, companies that we believe have products or capabilities that are a strategic or commercial fit with our current product candidates and business or otherwise offer opportunities for our company. In connection with these acquisitions or investments, we may:

    issue stock that would dilute our stockholders' percentage of ownership;

    incur debt and assume liabilities; and

    incur amortization expenses related to intangible assets or incur large and immediate write-offs.

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        We also may be unable to find suitable acquisition candidates and we may not be able to complete acquisitions on favorable terms, if at all. If we do complete an acquisition, we cannot assure you that it will ultimately strengthen our competitive position or that it will not be viewed negatively by customers, financial markets or investors. Further, future acquisitions could also pose numerous additional risks to our operations, including:

    problems integrating the purchased business, products or technologies;

    increases to our expenses;

    the failure to have discovered undisclosed liabilities of the acquired asset or company;

    diversion of management's attention from their day-to-day responsibilities;

    harm to our operating results or financial condition;

    entrance into markets in which we have limited or no prior experience; and

    potential loss of key employees, particularly those of the acquired entity.

        We may not be able to complete one or more acquisitions or effectively integrate the operations, products or personnel gained through any such acquisition without a material adverse effect on our business, financial condition and results of operations.

We are relying on the commercial availability of diagnostic tests to identify patients who may benefit from TSR-011.

        We believe that existing commercially available diagnostic tests for the identification of ALK fusions will facilitate rapid and efficient development of our lead ALK inhibitor product candidate, TSR-011. These diagnostic tests are provided by third parties who have no contractual obligation to us to continue to manufacture these tests or make them available commercially. Furthermore, these diagnostic tests are subject to regulation by the FDA and comparable foreign regulatory authorities and the FDA or another regulatory authority could limit their use. Furthermore, the providers of these diagnostic tests may encounter production difficulties that could constrain the supply of the tests or the providers of the tests could otherwise decide to discontinue selling or manufacturing the diagnostic tests. If diagnostic tests are not commercially available, development or commercialization of TSR-011 could be adversely affected.

Our business and operations would suffer in the event of system failures.

        Despite the implementation of security measures, our internal computer systems, and those of our CROs and other third parties on which we rely, are vulnerable to damage from computer viruses, unauthorized access, natural disasters, terrorism, war and telecommunication and electrical failures. If such an event were to occur and cause interruptions in our operations, it could result in a material disruption of our drug development programs. For example, the loss of clinical trial data from completed or ongoing or planned clinical trials could result in delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data. To the extent that any disruption or security breach were to result in a loss of or damage to our data or applications, or inappropriate disclosure of confidential or proprietary information, we could incur liability and the further development of our product candidates could be delayed.

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Risks Related to Our Dependence on Third Parties

We rely on third parties to conduct our preclinical and clinical trials. If these third parties do not successfully carry out their contractual duties or meet expected deadlines, we may not be able to obtain regulatory approval for or commercialize our product candidates and our business could be substantially harmed.

        We have relied upon and plan to continue to rely upon third-party CROs to monitor and manage data for our ongoing preclinical and clinical programs. We rely on these parties for execution of our preclinical and clinical trials, and control only certain aspects of their activities. Nevertheless, we are responsible for ensuring that each of our studies is conducted in accordance with the applicable protocol and legal, regulatory and scientific standards, and our reliance on the CROs does not relieve us of our regulatory responsibilities. We also rely on third parties to assist in conducting our preclinical studies in accordance with Good Laboratory Practices, or GLP, and the Animal Welfare Act requirements. We and our CROs are required to comply with current GCP, which are regulations and guidelines enforced by the FDA, the Competent Authorities of the Member States of the European Economic Area, or the EEA, and comparable foreign regulatory authorities for all of our products in clinical development. Regulatory authorities enforce these GCP through periodic inspections of trial sponsors, principal investigators and trial sites. If we or any of our CROs fail to comply with applicable GCP, the clinical data generated in our clinical trials may be deemed unreliable and the FDA or comparable foreign regulatory authorities may require us to perform additional clinical trials before approving our marketing applications. We cannot assure you that upon inspection by a given regulatory authority, such regulatory authority will determine that any of our clinical trials comply with GCP requirements. In addition, our clinical trials must be conducted with product produced under cGMP requirements. Failure to comply with these regulations may require us to repeat preclinical and clinical trials, which would delay the regulatory approval process.

        Our CROs are not our employees, and except for remedies available to us under our agreements with such CROs, we cannot control whether or not they devote sufficient time and resources to our on-going clinical, nonclinical and preclinical programs. If CROs do not successfully carry out their contractual duties or obligations or meet expected deadlines or if the quality or accuracy of the clinical data they obtain is compromised due to the failure to adhere to our clinical protocols, regulatory requirements or for other reasons, our clinical trials may be extended, delayed or terminated and we may not be able to obtain regulatory approval for or successfully commercialize our product candidates. As a result, our results of operations and the commercial prospects for our product candidates would be harmed, our costs could increase and our ability to generate revenues could be delayed.

        Because we have relied on third parties, our internal capacity to perform these functions is limited. Outsourcing these functions involves risk that third parties may not perform to our standards, may not produce results in a timely manner or may fail to perform at all. In addition, the use of third-party service providers requires us to disclose our proprietary information to these parties, which could increase the risk that this information will be misappropriated. We currently have a small number of employees, which limits the internal resources we have available to identify and monitor our third-party providers. To the extent we are unable to identify and successfully manage the performance of third-party service providers in the future, our business may be adversely affected. Though we carefully manage our relationships with our CROs, there can be no assurance that we will not encounter similar challenges or delays in the future or that these delays or challenges will not have a material adverse impact on our business, financial condition and prospects.

If we lose our relationships with CROs, our drug development efforts could be delayed.

        We are substantially dependent on third-party vendors and CROs for preclinical studies and clinical trials related to our drug development efforts. Switching or adding additional CROs involves additional cost and requires management time and focus. Our CROs have the right to terminate their

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agreements with us in the event of an uncured material breach. In addition, some of our CROs have an ability to terminate their respective agreements with us if it can be reasonably demonstrated that the safety of the subjects participating in our clinical trials warrants such termination, if we make a general assignment for the benefit of our creditors or if we are liquidated. Identifying, qualifying and managing performance of third-party service providers can be difficult, time consuming and cause delays in our development programs. There is a limited number of third-party service providers that specialize in or have the expertise required to achieve our business objectives. In addition, there is a natural transition period when a new CRO commences work and the new CRO may not provide the same type or level of services as the original provider. If any of our relationships with our third-party CROs terminate, we may not be able to enter into arrangements with alternative CROs or to do so on commercially reasonable terms.

Adverse developments affecting one or more of our third-party suppliers could harm our results of operations.

        We do not own or operate facilities for the manufacture of our product candidates. We rely upon third-party suppliers, including sole-source suppliers, for our material for preclinical and clinical testing purposes and intend to continue to do so in the future. We also expect to rely upon third parties to produce materials required for the commercial production of our product candidates if we succeed in obtaining necessary regulatory approvals. Any significant disruption in our supplier relationships, particularly relationships with our sole-source suppliers, could harm our business. If we are unable to arrange for third-party manufacturing sources, or to do so on commercially reasonable terms, we may not be able to complete development of our product candidates or market them.

        Reliance on third-party manufacturers entails risks to which we would not be subject if we manufactured product candidates ourselves, including reliance on the third party for regulatory compliance and quality assurance, the possibility of breach of the manufacturing agreement by the third party because of factors beyond our control (including a failure to synthesize and manufacture our product candidates in accordance with our product specifications) and the possibility of termination or nonrenewal of the agreement by the third party, based on its own business priorities, at a time that is costly or damaging to us. In addition, the FDA and other regulatory authorities require that our product candidates be manufactured according to cGMP and similar foreign standards. Any failure by our third-party manufacturers to comply with cGMP or failure to scale up manufacturing processes, including any failure to deliver sufficient quantities of product candidates in a timely manner, could lead to a delay in, or failure to obtain, regulatory approval of any of our product candidates. In addition, such failure could be the basis for the FDA to issue a warning or untitled letter, withdraw approvals for product candidates previously granted to us, or take other regulatory or legal action, including recall or seizure, total or partial suspension of production, suspension of ongoing clinical trials, refusal to approve pending applications or supplemental applications, detention or product, refusal to permit the import or export of products, injunction, or imposing civil and criminal penalties.

        We source key materials from third parties, either directly through agreements with suppliers or indirectly through our manufacturers who have agreements with suppliers. There are a small number of suppliers for certain capital equipment and key materials that are used to manufacture our drugs. Such suppliers may not sell these key materials to our manufacturers at the times we need them or on commercially reasonable terms. We do not have any control over the process or timing of the acquisition of these key materials by our manufacturers. Moreover, we currently do not have any agreements for the commercial production of these key materials. Any significant delay in the supply of a product candidate or its key materials for an ongoing clinical study due to the need to replace a third-party manufacturer could considerably delay completion of our clinical studies, product testing and potential regulatory approval of our product candidates. If our manufacturers or we are unable to purchase these key materials after regulatory approval has been obtained for our product candidates,

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the commercial launch of our product candidates would be delayed or there would be a shortage in supply, which would impair our ability to generate revenues from the sale of our product candidates.

        Because of the complex nature of our compounds, our manufacturers may not be able to manufacture our compounds at a cost or in quantities or in a timely manner necessary to make commercially successful products. If we successfully commercialize any of our drugs, we may be required to establish large-scale commercial manufacturing capabilities. In addition, as our drug development pipeline increases and matures, we will have a greater need for clinical study and commercial manufacturing capacity. We have no experience manufacturing pharmaceutical products on a commercial scale and some of these suppliers will need to increase their scale of production to meet our projected needs for commercial manufacturing, the satisfaction of which on a timely basis may not be met.

Risks Related to Our Intellectual Property

If we are unable to protect our intellectual property rights, our competitive position could be harmed and we could be required to incur significant expenses to enforce our rights.

        We depend on our ability to protect our proprietary technology. We rely on trade secret, patent, copyright and trademark laws, and confidentiality, licensing and other agreements with employees and third parties, all of which offer only limited protection. Our success depends in large part on our ability to obtain and maintain patent protection in the United States and other countries with respect to our proprietary technology and products. We seek to protect our proprietary position by filing patent applications in the United States and abroad related to our novel technologies and products that are important to our business. The patent positions of biotechnology and pharmaceutical companies generally are highly uncertain, involve complex legal and factual questions and have in recent years been the subject of much litigation. As a result, the issuance, scope, validity, enforceability and commercial value of our patents, including those patent rights licensed to us by third parties are highly uncertain.

        The steps we have taken to protect our proprietary rights may not be adequate to preclude misappropriation of our proprietary information or infringement of our intellectual property rights, both inside and outside the United States. The rights already granted under any of our currently issued patents and those that may be granted under future issued patents may not provide us with the proprietary protection or competitive advantages we are seeking. If we are unable to obtain and maintain patent protection for our technology and products, or if the scope of the patent protection obtained is not sufficient, our competitors could develop and commercialize technology and products similar or superior to ours, and our ability to successfully commercialize our technology and products may be adversely affected.

        With respect to patent rights, we do not know whether any of our pending patent applications, will result in the issuance of patents that protect our technology or products, or which will effectively prevent others from commercializing competitive technologies and products. Although we have a number of issued patents covering our technology, our pending applications cannot be enforced against third parties practicing the technology claimed in such applications unless and until a patent issues from such applications. Further, the examination process may require us to narrow our claims, which may limit the scope of patent protection that we may obtain. Because the issuance of a patent is not conclusive as to its inventorship, scope, validity or enforceability, issued patents that we own or have licensed from third parties may be challenged in the courts or patent offices in the United States and abroad. Such challenges may result in the loss of patent protection, the narrowing of claims in such patents, or the invalidity or unenforceability of such patents, which could limit our ability to stop others from using or commercializing similar or identical technology and products, or limit the duration of the patent protection for our technology and products. Protecting against the unauthorized use of our

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patented technology, trademarks and other intellectual property rights is expensive, difficult and, may in some cases not be possible. In some cases, it may be difficult or impossible to detect third party infringement or misappropriation of our intellectual property rights, even in relation to issued patent claims, and proving any such infringement may be even more difficult.

        The patent prosecution process is expensive and time-consuming, and we may not be able to file and prosecute all necessary or desirable patent applications at a reasonable cost or in a timely manner. It is also possible that we will fail to identify patentable aspects of inventions made in the course of our development and commercialization activities before it is too late to obtain patent protection on them. Further, given the amount of time required for the development, testing and regulatory review of new product candidates, patents protecting such candidates might expire before or shortly after such candidates are commercialized. We expect to seek extensions of patent terms where these are available in any countries where we are prosecuting patents. This includes in the United States under the Drug Price Competition and Patent Term Restoration Act of 1984, which permits a patent term extension of up to five years beyond the expiration of the patent. However the applicable authorities, including the FDA in the United States, and any equivalent regulatory authority in other countries, may not agree with our assessment of whether such extensions are available, and may refuse to grant extensions to our patents, or may grant more limited extensions than we request. If this occurs, our competitors may be able to take advantage of our investment in development and clinical trials by referencing our clinical and preclinical data and launch their product earlier than might otherwise be the case. Changes in either the patent laws or interpretation of the patent laws in the United States and other countries may diminish the value of our patents or narrow the scope of our patent protection. The laws of foreign countries may not protect our rights to the same extent as the laws of the United States, and these foreign laws may also be subject to change. Publications of discoveries in the scientific literature often lag behind the actual discoveries, and patent applications in the United States and other jurisdictions are typically not published until 18 months after filing, or in some cases not at all. Therefore we cannot be certain that we or our licensors were the first to make the inventions claimed in our owned or licensed patents or pending patent applications, or that we or our licensors were the first to file for patent protection of such inventions.

        Currently, in the United States, assuming the other requirements for patentability are met, the first to make the claimed invention is entitled to the patent, while outside the United States, the first to file a patent application is entitled to the patent. In March 2013, the United States will transition to a 'first to file' system in which the first inventor to file a patent application will be entitled to the patent. Under either the current system or new one, third parties will be allowed to submit prior art prior to the issuance of a patent by the United States Patent and Trademark Office, and may become involved in opposition, derivation, reexamination, inter-partes review or interference proceedings challenging our patent rights or the patent rights of others. An adverse determination in any such submission, proceeding or litigation could reduce the scope of, or invalidate, our patent rights, which could adversely affect our competitive position with respect to third parties.

We may become involved in lawsuits to protect or enforce our intellectual property, which could be expensive, time consuming and unsuccessful.

        Competitors may infringe our patents or misappropriate or otherwise violate our intellectual property rights. To counter infringement or unauthorized use, litigation may be necessary in the future to enforce or defend our intellectual property rights, to protect our trade secrets or to determine the validity and scope of our own intellectual property rights or the proprietary rights of others. This can be expensive and time consuming. Many of our current and potential competitors have the ability to dedicate substantially greater resources to defend their intellectual property rights than we can. Accordingly, despite our efforts, we may not be able to prevent third parties from infringing upon or misappropriating our intellectual property. Litigation could result in substantial costs and diversion of

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management resources, which could harm our business and financial results. In addition, in an infringement proceeding, a court may decide that a patent owned by or licensed to us is invalid or unenforceable, or may refuse to stop the other party from using the technology at issue on the grounds that our patents do not cover the technology in question. An adverse result in any litigation proceeding could put one or more of our patents at risk of being invalidated, held unenforceable or interpreted narrowly. Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information could be compromised by disclosure during this type of litigation.

Third parties may initiate legal proceedings alleging that we are infringing their intellectual property rights, the outcome of which would be uncertain and could have a material adverse effect on the success of our business.

        Our commercial success depends upon our ability and the ability of our collaborators to develop, manufacture, market and sell our product candidates, and to use our proprietary technologies without infringing the proprietary rights of third parties. We may become party to, or threatened with, future adversarial proceedings or litigation regarding intellectual property rights with respect to our products and technology, including interference proceedings before the U.S. Patent and Trademark Office. Third parties may assert infringement claims against us based on existing patents or patents that may be granted in the future. If we are found to infringe a third party's intellectual property rights, we could be required to obtain a license from such third party to continue developing and commercializing our products and technology. However, we may not be able to obtain any required license on commercially reasonable terms or at all. Even if we are able to obtain a license, it may be non-exclusive, thereby giving our competitors access to the same technologies licensed to us. We could be forced, including by court order, to cease commercializing the infringing technology or product. In addition, in any such proceeding or litigation, we could be found liable for monetary damages. A finding of infringement could prevent us from commercializing our product candidates or force us to cease some of our business operations, which could materially harm our business. Any claims by third parties that we have misappropriated their confidential information or trade secrets could have a similar negative impact on our business.

We may be subject to claims that our employees have wrongfully used or disclosed alleged trade secrets of their former employers.

        Many of our employees were previously employed at other biotechnology or pharmaceutical companies, including our competitors or potential competitors. Although we try to ensure that our employees do not use the proprietary information or know-how of others in their work for us, we may be subject to claims that we or these employees have used or disclosed intellectual property, including trade secrets or other proprietary information, of any such employee's former employer. Litigation may be necessary to defend against these claims. If we fail in defending any such claims, in addition to paying monetary damages, we may lose valuable intellectual property rights or personnel. Even if we are successful in defending against such claims, litigation could result in substantial costs and be a distraction to management.

Intellectual property disputes could cause us to spend substantial resources and distract our personnel from their normal responsibilities.

        Even if resolved in our favor, litigation or other legal proceedings relating to intellectual property claims may cause us to incur significant expenses, and could distract our technical and/or management personnel from their normal responsibilities. In addition, there could be public announcements of the results of hearings, motions or other interim proceedings or developments and if securities analysts or investors perceive these results to be negative, it could have a substantial adverse effect on the price of

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our common stock. Such litigation or proceedings could substantially increase our operating losses and reduce the resources available for development activities or any future sales, marketing or distribution activities. We may not have sufficient financial or other resources to adequately conduct such litigation or proceedings. Some of our competitors may be able to sustain the costs of such litigation or proceedings more effectively than we can because of their greater financial resources. Uncertainties resulting from the initiation and continuation of patent litigation or other proceedings could have a material adverse effect on our ability to compete in the marketplace.

If we are unable to protect the confidentiality of our trade secrets, our business and competitive position would be harmed.

        In addition to seeking patents for some of our technology and products, we also rely on trade secrets, including unpatented know-how, technology and other proprietary information, to maintain our competitive position. We seek to protect these trade secrets, in part, by entering into non-disclosure and confidentiality agreements with parties who have access to them, such as our employees, corporate collaborators, outside scientific collaborators, contract manufacturers, consultants, advisors and other third parties. We also enter into confidentiality and invention or patent assignment agreements with our employees and consultants. Despite these efforts, any of these parties may breach the agreements and disclose our proprietary information, including our trade secrets, and we may not be able to obtain adequate remedies for such breaches. Enforcing a claim that a party illegally disclosed or misappropriated a trade secret is difficult, expensive and time-consuming, and the outcome is unpredictable. In addition, some courts both within and outside the United States may be less willing or unwilling to protect trade secrets. If any of our trade secrets were to be lawfully obtained or independently developed by a competitor, we would have no right to prevent such competitor from using that technology or information to compete with us, which could harm our competitive position.

Risks Related to this Offering and Ownership of Our Common Stock

We do not know whether an active, liquid and orderly trading market will develop for our common stock or what the market price of our common stock will be and as a result it may be difficult for you to sell your shares of our common stock.

        Prior to this offering there has been no market for shares of our common stock. Although we expect that our common stock will be approved for listing on The NASDAQ Global Market, an active trading market for our shares may never develop or be sustained following this offering. The initial public offering price for our common stock was determined through negotiations with the underwriters, and the negotiated price may not be indicative of the market price of our common stock after this offering. The market value of our common stock may decrease from the initial public offering price. As a result of these and other factors, you may be unable to resell your shares of our common stock at or above the initial public offering price. The lack of an active market may impair your ability to sell your shares at the time you wish to sell them or at a price that you consider reasonable. The lack of an active market may also reduce the fair market value of your shares. Further, an inactive market may also impair our ability to raise capital by selling shares of our common stock and may impair our ability to enter into strategic partnerships or acquire companies or products by using our shares of common stock as consideration. The price of our stock may be volatile, and you could lose all or part of your investment.

        The trading price of our common stock following this offering is likely to be highly volatile and could be subject to wide fluctuations in response to various factors, some of which are beyond our control. In addition to the factors discussed in this "Risk Factors" section and elsewhere in this prospectus, these factors include:

    the success of competitive products or technologies;

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    regulatory actions with respect to our products or our competitors' products;

    actual or anticipated changes in our growth rate relative to our competitors;

    announcements by us or our competitors of significant acquisitions, strategic partnerships, joint ventures, collaborations or capital commitments;

    results of clinical trials of our product candidates or those of our competitors;

    regulatory or legal developments in the United States and other countries;

    developments or disputes concerning patent applications, issued patents or other proprietary rights;

    the recruitment or departure of key personnel;

    the level of expenses related to any of our product candidates or clinical development programs;

    the results of our efforts to in-license or acquire additional product candidates or products;

    actual or anticipated changes in estimates as to financial results, development timelines or recommendations by securities analysts;

    variations in our financial results or those of companies that are perceived to be similar to us;

    fluctuations in the valuation of companies perceived by investors to be comparable to us;

    share price and volume fluctuations attributable to inconsistent trading volume levels of our shares;

    announcement or expectation of additional financing efforts;

    sales of our common stock by us, our insiders or our other stockholders;

    changes in the structure of healthcare payment systems;

    market conditions in the pharmaceutical and biotechnology sectors; and

    general economic, industry and market conditions.

        In addition, the stock market in general, and the NASDAQ Global Market and biotechnology companies in particular, have experienced extreme price and volume fluctuations that have often been unrelated or disproportionate to the operating performance of these companies. Broad market and industry factors may negatively affect the market price of our common stock, regardless of our actual operating performance. The realization of any of the above risks or any of a broad range of other risks, including those described in these "Risk Factors," could have a dramatic and material adverse impact on the market price of our common stock.

We may be subject to securities litigation, which is expensive and could divert management attention.

        Our share price may be volatile, and in the past companies that have experienced volatility in the market price of their stock have been subject to securities class action litigation. We may be the target of this type of litigation in the future. Securities litigation against us could result in substantial costs and divert our management's attention from other business concerns, which could seriously harm our business.

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Our principal stockholders and management own a significant percentage of our stock and will be able to exert significant control over matters subject to stockholder approval.

        Prior to this offering, our executive officers, directors, holders of 5% or more of our capital stock and their respective affiliates beneficially owned approximately 81.3% of our voting stock and, upon the closing of this offering, that same group will hold approximately      % of our outstanding voting stock (assuming no exercise of the underwriters' over-allotment option and no exercise of outstanding options) in each case assuming the conversion of all outstanding shares of our preferred stock into shares of our common stock immediately prior to the closing of this offering. Therefore, even after this offering these stockholders will have the ability to control us through this ownership position. These stockholders may be able to determine all matters requiring stockholder approval. For example, these stockholders may be able to control elections of directors, amendments of our organizational documents, or approval of any merger, sale of assets, or other major corporate transaction. This may prevent or discourage unsolicited acquisition proposals or offers for our common stock that you may feel are in your best interest as one of our stockholders. The interests of this group of stockholders may not always coincide with your interests or the interests of other stockholders and they may act in a manner that advances their best interests and not necessarily those of other stockholders, including seeking a premium value for their common stock, and might affect the prevailing market price for our common stock.

If you purchase our common stock in this offering, you will incur immediate and substantial dilution in the book value of your shares.

        The initial public offering price is substantially higher than the net tangible book value per share of our common stock. Investors purchasing common stock in this offering will pay a price per share that substantially exceeds the book value of our tangible assets after subtracting our liabilities. As a result, investors purchasing common stock in this offering will incur immediate dilution of $      per share, based on an initial public offering price of $      per share, which is the midpoint of the price range set forth on the cover page of this prospectus. Further, investors purchasing common stock in this offering will contribute approximately      % of the total amount invested by stockholders since our inception, but will own only approximately      % of the shares of common stock outstanding immediately following giving effect to this offering.

        This dilution is due to our investors who purchased shares prior to this offering having paid substantially less than the price offered to the public in this offering when they purchased their shares. In addition, as of March 1, 2012, options to purchase 3,252,500 shares of our common stock at a weighted-average exercise price of $            per share were outstanding. The exercise of any of these options would result in additional dilution. As a result of the dilution to investors purchasing shares in this offering, investors may receive significantly less than the purchase price paid in this offering, if anything, in the event of our liquidation. Further, because we may need to raise additional capital to fund our clinical development programs, we may in the future sell substantial amounts of common stock or securities convertible into or exchangeable for common stock. These future issuances of equity or equity-linked securities, together with the exercise of outstanding options and any additional shares issued in connection with acquisitions, if any, may result in further dilution to investors. For a further description of the dilution that you will experience immediately following this offering, see "Dilution."

We will incur increased costs as a result of operating as a public company, and our management will be required to devote substantial time to new compliance initiatives.

        As a public company, we will incur significant legal, accounting and other expenses that we did not incur as a private company. We will be subject to the reporting requirements of the Securities Exchange Act of 1934, as amended, or the Exchange Act, the Sarbanes-Oxley Act of 2002, or the Sarbanes-Oxley Act, the Dodd-Frank Wall Street Reform and Protection Act, as well as rules adopted, and to be adopted, by the Securities and Exchange Commission, or the SEC, and the NASDAQ Stock Market.

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Our management and other personnel will need to devote a substantial amount of time to these compliance initiatives. Moreover, we expect these rules and regulations to substantially increase our legal and financial compliance costs and to make some activities more time-consuming and costly. The increased costs will increase our consolidated net loss. For example, we expect these rules and regulations to make it more difficult and more expensive for us to obtain director and officer liability insurance and we may be required to incur substantial costs to maintain the sufficient coverage. We cannot predict or estimate the amount or timing of additional costs we may incur to respond to these requirements. The impact of these requirements could also make it more difficult for us to attract and retain qualified persons to serve on our board of directors, our board committees or as executive officers.

        The Sarbanes-Oxley Act requires, among other things, that we maintain effective internal controls for financial reporting and disclosure controls and procedures. In particular, we will be required to perform system and process evaluation and testing of our internal controls over financial reporting to allow management to report, commencing in our annual report on Form 10-K for the year ending December 31, 2013, on the effectiveness of our internal controls over financial reporting, if then required by Section 404 of the Sarbanes-Oxley Act. Our testing, or the subsequent testing by our independent registered public accounting firm, may reveal deficiencies in our internal controls over financial reporting that are deemed to be material weaknesses. Our compliance with Section 404 will require that we incur substantial accounting expense and expend significant management efforts. We currently do not have an internal audit group, and we will need to hire additional accounting and financial staff with appropriate public company experience and technical accounting knowledge. Moreover, if we are not able to comply with the requirements of Section 404 in a timely manner or if we identify or our independent registered public accounting firm identifies deficiencies in our internal controls over financial reporting that are deemed to be material weaknesses, the financial markets could lose confidence in the reliability of our financial statements, the market price of our stock could decline and we could be subject to sanctions or investigations by the NASDAQ, the SEC or other regulatory authorities.

Because we do not anticipate paying any cash dividends on our capital stock in the foreseeable future, capital appreciation, if any, will be your sole source of gain.

        We have never declared or paid cash dividends on our capital stock. We currently intend to retain all of our future earnings, if any, to finance the growth and development of our business. In addition, the terms of any future debt agreements may preclude us from paying dividends. As a result, capital appreciation, if any, of our common stock will be your sole source of gain for the foreseeable future.

Sales of a substantial number of shares of our common stock in the public market could cause our stock price to fall.

        Sales of a substantial number of shares of our common stock in the public market could occur at any time. These sales, or the perception in the market that the holders of a large number of shares intend to sell shares, could reduce the market price of our common stock. After this offering, we will have outstanding             shares of common stock based on the number of shares outstanding as of December 31, 2011, assuming: (i) no exercise of the underwriters' over-allotment option; and (ii) the conversion of all outstanding shares of our preferred stock into 67,936,761 shares of common stock immediately prior to the closing of this offering. This includes the shares that we are selling in this offering, which may be resold in the public market immediately without restriction, unless purchased by our affiliates. Of the remaining shares,            shares are currently restricted as a result of securities laws or lock-up agreements but will be able to be sold after the offering as described in the "Shares Eligible for Future Sale" section of this prospectus. Moreover, after this offering, holders of an aggregate of            shares of our common stock will have rights, subject to certain conditions, to require us to file registration statements covering their shares or, along with holders of an additional            

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shares of our common stock, to include their shares in registration statements that we may file for ourselves or other stockholders. We also intend to register all shares of common stock that we may issue under our equity compensation plans. Once we register these shares, they can be freely sold in the public market upon issuance, subject to volume limitations applicable to affiliates and the lock-up agreements described in the "Underwriting" section of this prospectus.

Our disclosure controls and procedures may not prevent or detect all errors or acts of fraud.

        Upon completion of this offering, we will become subject to the periodic reporting requirements of the Exchange Act. Our disclosure controls and procedures are designed to reasonably assure that information required to be disclosed by us in reports we file or submit under the Exchange Act is accumulated and communicated to management, recorded, processed, summarized and reported within the time periods specified in the rules and forms of the SEC. We believe that any disclosure controls and procedures or internal controls and procedures, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met.

        These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns can occur because of simple error or mistake. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people or by an unauthorized override of the controls. Accordingly, because of the inherent limitations in our control system, misstatements due to error or fraud may occur and not be detected.

Future sales and issuances of our common stock or rights to purchase common stock, including pursuant to our equity incentive plans, could result in additional dilution of the percentage ownership of our stockholders and could cause our stock price to fall.

        We expect that significant additional capital will be needed in the future to continue our planned operations. To raise capital, we may sell substantial amounts of common stock or securities convertible into or exchangeable for common stock. These future issuances of common stock or common stock-related securities, together with the exercise of outstanding options and any additional shares issued in connection with acquisitions, if any, may result in material dilution to our investors. Such sales may also result in material dilution to our existing stockholders, and new investors could gain rights, preferences and privileges senior to those of holders of our common stock, including shares of common stock sold in this offering.

        Pursuant to our equity incentive plans, our compensation committee is authorized to grant equity-based incentive awards to our directors, executive officers and other employees and service providers, including officers, employees and service providers of our subsidiaries and affiliates. The number of shares of our common stock available for future grant under our 2012 Omnibus Incentive Plan, or the 2012 Plan, which will become effective immediately prior to the closing of this offering, is            plus the number of shares of our common stock reserved for issuance under our 2010 Stock Incentive Plan, or the 2010 Plan, as of the effective date of the 2012 Plan. As of December 31, 2011, there were 3,146,500 shares of our common stock reserved for future issuance under our 2010 Plan. The number of shares of our common stock reserved for issuance under our 2012 Plan will be increased (i) from time to time by the number of shares of our common stock forfeited upon the expiration, cancellation, forfeiture, cash settlement or other termination of awards under our 2010 Plan following the effective date of the 2012 plan and (ii) on January 1 of each year, starting in 2013, by the lesser of (x)       shares; (y) a number additional shares of our common stock representing      % of our outstanding shares of common stock; or (z) the number of shares determined by our board of directors. Future option grants and issuances of common stock under our 2012 Plan may have an adverse effect on the market price of our common stock.

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We have broad discretion in the use of the net proceeds from this offering and may not use them effectively.

        Although we currently intend to use the net proceeds from this offering in the manner described in "Use of Proceeds" elsewhere in this prospectus, our management will have broad discretion in the application of the net proceeds from this offering and could spend the proceeds in ways that do not improve our results of operations or enhance the value of our common stock. The failure by our management to apply these funds effectively could result in financial losses that could have a material adverse effect on our business, cause the price of our common stock to decline and delay the development of our product candidates. Pending their use, we may invest the net proceeds from this offering in a manner that does not produce income or that loses value.

Some provisions of our charter documents and Delaware law may have anti-takeover effects that could discourage an acquisition of us by others, even if an acquisition would be beneficial to our stockholders and may prevent attempts by our stockholders to replace or remove our current management.

        Provisions in our amended and restated certificate of incorporation and amended and restated bylaws that will become effective in connection with the closing of this offering, as well as provisions of Delaware law, could make it more difficult for a third-party to acquire us or increase the cost of acquiring us, even if doing so would benefit our stockholders, or remove our current management. These provisions include:

    authorizing the issuance of "blank check" preferred stock, the terms of which may be established and shares of which may be issued without stockholder approval;

    prohibiting cumulative voting in the election of directors, which would otherwise allow for less than a majority of stockholders to elect director candidates;

    prohibiting stockholder action by written consent, thereby requiring all stockholder actions to be taken at a meeting of our stockholders;

    eliminating the ability of stockholders to call a special meeting of stockholders; and

    establishing advance notice requirements for nominations for election to the board of directors or for proposing matters that can be acted upon at stockholder meetings.

        These provisions may frustrate or prevent any attempts by our stockholders to replace or remove our current management by making it more difficult for stockholders to replace members of our board of directors, who are responsible for appointing the members of our management. Because we are incorporated in Delaware, we are governed by the provisions of Section 203 of the Delaware General Corporation Law, which may discourage, delay or prevent someone from acquiring us or merging with us whether or not it is desired by or beneficial to our stockholders. Under Delaware law, a corporation may not, in general, engage in a business combination with any holder of 15% or more of its capital stock unless the holder has held the stock for three years or, among other things, the board of directors has approved the transaction. Any provision of our amended and restated certificate of incorporation or amended and restated bylaws or Delaware law that has the effect of delaying or deterring a change in control could limit the opportunity for our stockholders to receive a premium for their shares of our common stock, and could also affect the price that some investors are willing to pay for our common stock.

If securities or industry analysts do not publish research or publish inaccurate or unfavorable research about our business, our stock price and trading volume could decline.

        The trading market for our common stock will depend in part on the research and reports that securities or industry analysts publish about us or our business. Securities and industry analysts do not currently, and may never, publish research on our company. If no securities or industry analysts commence coverage of our company, the trading price for our stock would likely be negatively impacted. In the event securities or industry analysts initiate coverage, if one or more of the analysts who cover us downgrade our stock or publish inaccurate or unfavorable research about our business, our stock price would likely decline. If one or more of these analysts cease coverage of our company or fail to publish reports on us regularly, demand for our stock could decrease, which might cause our stock price and trading volume to decline.

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SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS
AND INDUSTRY DATA

        This prospectus includes forward-looking statements. We may, in some cases, use terms such as "believes," "estimates," "anticipates," "expects," "plans," "intends," "may," "could," "might," "will," "should," "approximately" or other words that convey uncertainty of future events or outcomes to identify these forward-looking statements. Forward-looking statements appear in a number of places throughout this prospectus and include statements regarding our intentions, beliefs, projections, outlook, analyses or current expectations concerning, among other things, our ongoing and planned preclinical development and clinical trials, the timing of and our ability to make regulatory filings and obtain and maintain regulatory approvals for our product candidates, our intellectual property position, the degree of clinical utility of our products, particularly in specific patient populations, our ability to develop commercial functions, expectations regarding clinical trial data, our results of operations, cash needs, spending of the proceeds from this offering, financial condition, liquidity, prospects, growth and strategies, the industry in which we operate and the trends that may affect the industry or us.

        By their nature, forward-looking statements involve risks and uncertainties because they relate to events, competitive dynamics and industry change, and depend on the economic circumstances that may or may not occur in the future or may occur on longer or shorter timelines than anticipated. Although we believe that we have a reasonable basis for each forward-looking statement contained in this prospectus, we caution you that forward-looking statements are not guarantees of future performance and that our actual results of operations, financial condition and liquidity, and the development of the industry in which we operate may differ materially from the forward-looking statements contained in this prospectus. In addition, even if our results of operations, financial condition and liquidity, and the development of the industry in which we operate are consistent with the forward-looking statements contained in this prospectus, they may not be predictive of results or developments in future periods.

        Actual results could differ materially from our forward-looking statements due to a number of factors, including risks related to:

    our estimates regarding expenses, future revenues, capital requirements and needs for additional financing;

    the success and timing of our preclinical studies and clinical trials;

    the difficulties in obtaining and maintaining regulatory approval of our product candidates, and the labeling under any approval we may obtain;

    our plans and ability to develop and commercialize our product candidates;

    our failure to recruit or retain key scientific or management personnel or to retain our executive officers;

    the size and growth of the potential markets for our product candidates and our ability to serve those markets;

    regulatory developments in the United States and foreign countries;

    the rate and degree of market acceptance of any of our product candidates;

    our use of the proceeds from this offering;

    obtaining and maintaining intellectual property protection for our product candidates and our proprietary technology;

    the successful development of our commercialization capabilities, including sales and marketing capabilities;

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    recently enacted and future legislation regarding the healthcare system;

    the success of competing therapies and products that are or become available; and

    the performance of third parties, including contract research organizations and third-party manufacturers.

        Any forward-looking statements that we make in this prospectus speak only as of the date of such statement, and we undertake no obligation to update such statements to reflect events or circumstances after the date of this prospectus or to reflect the occurrence of unanticipated events. Comparisons of results for current and any prior periods are not intended to express any future trends or indications of future performance, unless expressed as such, and should only be viewed as historical data.

        You should also read carefully the factors described in the "Risk Factors" section of this prospectus and elsewhere to better understand the risks and uncertainties inherent in our business and underlying any forward-looking statements. As a result of these factors, we cannot assure you that the forward-looking statements in this prospectus will prove to be accurate. Furthermore, if our forward-looking statements prove to be inaccurate, the inaccuracy may be material. In light of the significant uncertainties in these forward-looking statements, you should not regard these statements as a representation or warranty by us or any other person that we will achieve our objectives and plans in any specified timeframe, or at all. The Private Securities Litigation Reform Act of 1995 and Section 27A of the Securities Act of 1933, as amended, do not protect any forward-looking statements that we make in connection with this offering.

        We obtained the industry, market and competitive position data in this prospectus from our own internal estimates and research as well as from industry and general publications and research surveys and studies conducted by third parties. While we believe that each of these studies and publications is reliable, we have not independently verified market and industry data from third-party sources. While we believe our internal company research is reliable and the market definitions we use are appropriate, neither such research nor these definitions have been verified by any independent source.

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USE OF PROCEEDS

        We estimate that our net proceeds from the sale of the shares of common stock in this offering will be approximately $         million, based on an assumed initial public offering price of $        per share, which is the midpoint of the price range set forth on the cover page of this prospectus, after deducting underwriting discounts and commissions and estimated offering expenses payable by us. If the underwriters exercise their over-allotment option in full, we estimate that our net proceeds will be approximately $        based on an assumed initial public offering price of $        per share, which is the midpoint of the price range set forth on the cover page of this prospectus, after deducting underwriting discounts and commissions and estimated offering expenses payable by us.

        The principal purposes of this offering are to obtain additional capital to support our operations, establish a public market for our common stock and to facilitate our future access to the public capital markets. We anticipate that we will use the net proceeds of this offering as follows:

    to fund the clinical development of rolapitant, currently in Phase 3 clinical trials;

    to advance the development of TSR-011, our preclinical product candidate;

    to in-license or acquire, as the case may be, product candidates, technologies, compounds, other assets or complementary businesses;

    for general corporate purposes; and

    for working capital.

        Although it is difficult to predict future liquidity requirements, we believe that the net proceeds from this offering and our existing cash and cash equivalents, together with interest thereon, will be sufficient to fund our operations for at least the next 12 months.

        The expected use of the net proceeds from this offering represents our intentions based upon our current plans and business conditions, which could change in the future as our plans and business conditions evolve. The amounts and timing of our actual expenditures depend on numerous factors, including the ongoing status of and results from our clinical trials and other studies, the progress of our preclinical development efforts and any unforeseen cash needs. As a result, our management will have broad discretion in applying the net proceeds of this offering. Although we may use a portion of the net proceeds of this offering for the acquisition or licensing, as the case may be, of product candidates, technologies, compounds, other assets or complementary businesses, we have no current understandings, agreements or commitments to do so.

        Pending these uses, we intend to invest the net proceeds of this offering in a variety of capital preservation investments, including short-term, interest-bearing investment grade securities, money market accounts, certificates of deposit and direct or guaranteed obligations of the U.S. government.

        Each $1.00 increase (decrease) in the assumed initial public offering price of $        per share, which is the midpoint of the price range set forth on the cover page of this prospectus, would increase (decrease) the net proceeds to us from this offering by approximately $         million, assuming the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and after deducting underwriting discounts and commissions and estimated offering expenses payable by us. We may also increase or decrease the number of shares we are offering. An increase of        shares in the number of shares offered by us, together with concomitant $1.00 increase in the assumed initial public offering price of $        per share, which is the midpoint of the price range set forth on the cover page of this prospectus, would increase the net proceeds to us from this offering by approximately $         million after deducting underwriting discounts and commissions and estimated offering expenses payable by us. Conversely, a decrease of            shares in the number of shares offered by us together with a concomitant $1.00 decrease in the assumed initial public offering price of $        per share, which is the midpoint of the price range set forth on the cover page of this prospectus, would decrease the net proceeds to us from this offering by approximately $         million after deducting underwriting discounts and commissions and estimated offering expenses payable by us. The as adjusted information discussed above is illustrative only and will be adjusted based on the actual public offering price and other terms of this offering determined at pricing.

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DIVIDEND POLICY

        We have never declared or paid any cash dividends on our capital stock. We currently intend to retain all available funds and any future earnings to support our operations and finance the growth and development of our business and do not intend to declare or pay any cash dividends in the foreseeable future. As a result, you will likely need to sell your shares of common stock to realize a return on your investment, and you may not be able to sell your shares at or above the price you paid for them.

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CAPITALIZATION

        The following table sets forth our consolidated cash and cash equivalents and our consolidated capitalization as of December 31, 2011 on:

    an actual basis;

    a pro forma basis giving effect to:

    (1)
    the issuance of 26,884,442 shares of our Series B preferred stock on March 21, 2012 resulting in net proceeds of approximately $58.3 million; and

    (2)
    the conversion of all outstanding shares of our preferred stock (including the shares of our Series B preferred stock issued on March 21, 2012) into 67,936,761 shares of our common stock immediately prior to the closing of this offering; and

    a pro forma as adjusted basis giving additional effect to the sale of            shares of our common stock offered in this offering, assuming an initial public offering price of $      per share, the midpoint of the price range set forth on the cover page of this prospectus, after deducting underwriting discounts and commissions and estimated offering expenses payable by us.

        The information in this table is illustrative only and our capitalization following the closing of this offering will be adjusted based on the actual initial public offering price and other terms of this offering determined at pricing. You should read this table in conjunction with the information contained in "Use of Proceeds," "Selected Consolidated Financial Data" and "Management's

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Discussion and Analysis of Financial Condition and Results of Operations," as well as the consolidated financial statements and the notes thereto included elsewhere in this prospectus.

 
  As of December 31, 2011  
 
  Actual   Pro Forma   Pro Forma
As Adjusted(1)(2)
 
 
   
  (unaudited)
  (unaudited)
 
 
  (dollars in thousands)
 

Cash and cash equivalents

  $ 39,825   $ 98,159   $    
               

Series A preferred stock, par value $0.0001 per share; 20,000,000 shares authorized; 20,000,000 shares issued and outstanding, actual; no shares authorized, issued or outstanding, pro forma and pro forma as adjusted

    21,570            

Series B preferred stock, par value $0.0001 per share; 46,436,782 shares authorized; 19,552,319 shares issued and outstanding, actual; no shares authorized, issued or outstanding, pro forma and pro forma as adjusted

   
42,148
   
       

Series O preferred stock, par value $0.0001 per share; 1,500,000 shares authorized; 1,500,000 shares issued and outstanding, actual; no shares authorized, issued or outstanding, pro forma and pro forma as adjusted

   
630
   
       

Common stock, par value $0.0001 per share; 85,459,770 shares authorized and 4,410,000 shares issued and outstanding, actual; 85,459,770 shares authorized and 72,346,761 shares issued and outstanding, pro forma; and             shares authorized and             shares issued and outstanding, pro forma as adjusted

   
   
7
       

Additional paid-in capital

   
305
   
122,980
       

Deficit accumulated during the development stage

   
(25,373

)
 
(25,373

)
     
               

Total stockholders' (deficit) equity

    (25,068 )   97,614        
               

Total capitalization

  $ 39,280   $ 97,614   $    
               

(1)
A $1.00 increase (decrease) in the assumed initial public offering price of $      per share, which is the midpoint of the price range set forth on the cover page of this prospectus, would increase (decrease) the pro forma as adjusted amount of each of cash and cash equivalents, additional paid-in capital, total stockholders' equity (deficit) and total capitalization by approximately $       million, assuming that the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and after deducting underwriting discounts and commissions and estimated offering expenses payable by us. An increase of            shares in the number of shares offered by us together with a concomitant $1.00 increase in the assumed initial public offering price of $      per share, which is the midpoint of the price range set forth on the cover page of this prospectus, would increase each of cash and cash equivalents, total stockholders' equity and total capitalization by approximately $       million after deducting underwriting discounts and commissions and any estimated offering expenses payable by us. Conversely, a decrease of            shares in the number of shares offered by us together with a concomitant $1.00 decrease in the assumed initial public offering price of $      per share, which is the midpoint of the price range set forth on the cover page of this prospectus, would decrease each of cash and cash equivalents, total stockholders' equity and total capitalization by approximately $       million after deducting underwriting discounts and commissions and any estimated offering expenses payable by us.

(2)
The pro forma as adjusted information discussed above is illustrative only and will be adjusted based on the actual initial public offering price and other terms of our initial public offering determined at the pricing of this offering.

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        The number of shares of our common stock to be outstanding immediately following this offering set forth above is based on 4,410,000 shares of our common stock outstanding as of December 31, 2011, and gives effect to (1) the issuance of 26,884,442 shares of our Series B preferred stock on March 21, 2012 and (2) the conversion of all outstanding shares of our preferred stock (including shares of our Series B preferred stock issued on March 21, 2012) into 67,936,761 shares of our common stock immediately prior to the closing of this offering.

        The number of shares of our common stock to be outstanding immediately following this offering set forth above excludes:

    3,127,500 shares of our common stock issuable upon the exercise of stock options outstanding as of December 31, 2011 at a weighted-average exercise price of $0.37 per share;

                         shares of our common stock reserved for future issuance under our 2012 Plan, which will become effective immediately prior to the closing of this offering, plus the number of shares of our common stock available for grant under our 2010 Plan as of the effectiveness of the 2012 Plan (which as of December 31, 2011 was 3,146,500), which shares will be added to the shares to be reserved under our 2012 Plan upon the effectiveness of the 2012 Plan, plus any annual increases in the number of shares of common stock reserved for future issuance under the 2012 Plan pursuant to an "evergreen provision" and any other shares that may become issuable under the 2012 Plan pursuant to its terms, as more fully described in "Executive and Director Compensation—Employee Benefit Plans—2012 Equity Incentive Plan;" and

                         shares of our common stock reserved for future issuance under our 2012 Employee Stock Purchase Plan, or the ESPP, which will become effective immediately prior to the closing of this offering, plus any other shares that may become issuable under the ESPP pursuant to its terms, as more fully described in "Executive and Director Compensation—Employee Benefit Plans—2012 Employee Stock Purchase Plan."

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DILUTION

        If you invest in our common stock in this offering, your ownership interest will be immediately diluted to the extent of the difference between the initial public offering price per share of our common stock and the pro forma as adjusted net tangible book value per share of our common stock upon closing of this offering. Net tangible book value per share of our common stock is determined at any date by subtracting our total liabilities from the amount of our total tangible assets (total assets less intangible assets) and dividing the difference by the number of shares of our common stock deemed to be outstanding at that date.

        Our historical net tangible book value (deficit) as of December 31, 2011 was approximately $39.3 million, or $8.91 per share, based on 4,410,000 shares of common stock outstanding as of December 31, 2011.

        On a pro forma basis, after giving effect to (1) a            for            reverse stock split that we anticipate will occur prior to the closing of this offering; (2) the issuance of 26,884,442 shares of our Series B preferred stock on March 21, 2012; and (3) the conversion of all outstanding shares of our preferred stock (including shares of our Series B preferred stock issued on March 21, 2012) into 67,936,761 shares of our common stock immediately prior to the closing of this offering, our net tangible book value as of December 31, 2011 would have been approximately $       million, or approximately $      per share of our pro forma outstanding common stock.

        Investors participating in this offering will incur immediate and substantial dilution. After giving effect to our receipt of approximately $      of estimated net proceeds (after deducting underwriting discounts and commissions and estimated offering expenses payable by us) from our sale of common stock in this offering at an assumed initial public offering price of $      per share, which is the midpoint of the price range set forth on the cover page of this prospectus, our pro forma as adjusted net tangible book value as of December 31, 2011 would have been $      , or $      per share. This amount represents an immediate increase in net tangible book value of $      per share of our common stock to existing stockholders and an immediate dilution in net tangible book value of $      per share of our common stock to new investors purchasing shares of common stock in this offering.

        The following tables illustrate this dilution on a per share basis:

Assumed initial public offering price per share

      $
         

Historical net tangible book value per share as of December 31, 2011 (unaudited)

  $    
         

Pro forma increase in net tangible book value per share attributable to pro forma transactions described in preceding paragraphs

       
         

Pro forma net tangible book value per share as of December 31, 2011 (unaudited)

       
         

Pro forma increase in net tangible book value per share attributable to investors participating in this offering

       
         

Pro forma as adjusted net tangible book value per share after this offering

       
         

Dilution of pro forma as adjusted net tangible book value per share to new investors

      $
         

        Each $1.00 increase (decrease) in the assumed initial public offering price of $      per share, which is the midpoint of the price range set forth on the cover page of this prospectus, would increase (decrease) our pro forma as adjusted net tangible book value by $      , the pro forma as adjusted net tangible book value per share after this offering by $      per share and the dilution in pro forma as

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adjusted net tangible book value to new investors in this offering by $      per share, assuming the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and after deducting the underwriting discounts and commissions and estimated offering expenses payable by us. We may also increase or decrease the number of shares we are offering. An increase of            shares in the number of shares offered by us, together with concomitant $1.00 increase in the assumed initial public offering price of $      per share, which is the midpoint of the price range set forth on the cover page of this prospectus, (a) would increase our pro forma as adjusted net tangible book value as of December 31, 2011 by approximately $       million and (b) would also increase the pro forma as adjusted net tangible book value per share after this offering and the dilution in net tangible book value per share to new investors by $      and $      respectively, assuming the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and after deducting underwriting discounts and commissions and estimated offering expenses payable by us. Conversely, a decrease of            shares in the number of shares offered by us together with a concomitant $1.00 decrease in the assumed initial public offering price of $      per share, which is the midpoint of the price range set forth on the cover page of this prospectus, (a) would decrease our pro forma as adjusted net tangible book value as of December 31, 2011 by approximately $       million and (b) would also decrease the pro forma as adjusted net tangible book value per share after this offering and the dilution in net tangible book value per share to new investors by $      and $       respectively, assuming the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and after deducting underwriting discounts and commissions and estimated offering expenses payable by us.

        The following table summarizes, as of December 31, 2011, giving effect to the pro forma adjustment noted above, the differences between the number of shares purchased from us, the total consideration paid to us, and the average price per share paid to us by existing stockholders and by new investors purchasing shares in this offering, before deducting underwriting discounts and commissions and estimated offering expenses payable by us, at an assumed initial public offering price of $      per share, which is the midpoint of the price range set forth on the cover page of this prospectus.

 
   
   
  Total
Consideration
   
 
 
  Shares Purchased    
 
 
  Average
Price
Per Share
 
 
  Number   Percent   Amount   Percent  
 
  (dollars in thousands, except per share amounts)
 

Existing investors

              $           $    

New investors

              $           $    
                       

Total

              $           $    
                       

        The number of shares of our common stock to be outstanding immediately following this offering set forth above excludes:

    3,127,500 shares of our common stock issuable upon the exercise of stock options outstanding as of December 31, 2011 at a weighted-average exercise price of $0.37 per share;

    shares of our common stock reserved for future issuance under our 2012 Plan, which will become effective immediately prior to the closing of this offering, plus the number of shares of our common stock available for grant under our 2010 Plan as of the effectiveness of the 2012 Plan (which as of December 31, 2011 was 3,146,500), which shares will be added to the shares to be reserved under our 2012 Plan upon the effectiveness of the 2012 Plan, plus any annual increases in the number of shares of common stock reserved for future issuance under the 2012 Plan pursuant to an "evergreen provision" and any other shares that may become issuable under the 2012 Plan pursuant to its terms, as more fully described in "Executive and Director Compensation—Employee Benefit Plans—2012 Equity Incentive Plan;" and

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    shares of our common stock reserved for future issuance under our 2012 Employee Stock Purchase Plan, or the ESPP, which will become effective immediately prior to the closing of this offering, plus any other shares that may become issuable under the ESPP pursuant to its terms, as more fully described in "Executive and Director Compensation—Employee Benefit Plans—2012 Employee Stock Purchase Plan."

        If the underwriters' over-allotment option is exercised in full, the pro forma as adjusted net tangible book value per share after giving effect to this offering would be $      per share, which amount represents an immediate increase in pro forma net tangible book value of $      per share of our common stock to existing stockholders and an immediate dilution in net tangible book value of $      per share of our common stock to new investors purchasing shares of common stock in this offering.

        If all our outstanding stock options had been exercised as of December 31, 2011, assuming the treasury stock method, our pro forma net tangible book value as of December 31, 2011 (calculated on the basis of the assumptions set forth above) would have been approximately $       million, or $      per share of our common stock, and the pro forma as adjusted net tangible book value would have been $      per share, representing dilution in our pro forma as adjusted net tangible book value per share to new investors of $      .

        In addition, we may choose to raise additional capital due to market conditions or strategic considerations even if we believe we have sufficient funds for our current or future operating plans. To the extent that we raise additional capital by issuing equity securities or convertible debt, your ownership will be further diluted.

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SELECTED CONSOLIDATED FINANCIAL DATA

        The following table sets forth certain of our selected historical financial data at the dates and for the periods indicated. The selected historical statement of operations data presented below for the year ended December 31, 2011, the period from March 26, 2010, which is the date of our inception, to December 31, 2010 and the period from March 26, 2010, which is the date of our inception, to December 31, 2011, and as of December 31, 2011 have been derived from our audited consolidated financial statements, which are included elsewhere in this prospectus. The historical results are not necessarily indicative of results expected in any future period.

        The selected historical consolidated financial data presented below should be read in conjunction with "Management's Discussion and Analysis of Financial Condition and Results of Operations" and our financial statements and the related notes thereto, which are included elsewhere in this prospectus. The selected historical consolidated financial information in this section is not intended to replace our financial statements and the related notes thereto.

 
  The Period from
March 26, 2010
(inception) to
December 31, 2010
  Year Ended
December 31,
2011
  The Period from
March 26, 2010
(inception) to
December 31, 2011
 
 
  (in thousands, except per share amounts)
 

Expenses:

                   

Research and development

  $ 46   $ 11,768   $ 11,814  

General and administrative

    1,668     3,158     4,826  

Acquired in-process research and development

    6,630     500     7,130  
               

Total expenses

    8,344     15,426     23,770  

Loss from operations

   
(8,344

)
 
(15,426

)
 
(23,770

)

Interest income

    20     38     58  

Other loss

    (651 )   (1,010 )   (1,661 )
               

Net loss

  $ (8,975 ) $ (16,398 ) $ (25,373 )
               

Basic and diluted net loss per common share(1)

  $ (7.61 ) $ (9.12 ) $ (16.58 )
               

Basic and diluted weighted average common shares outstanding(1)

    1,179     1,799     1,530  
               

Pro forma basic and diluted net loss per common share (unaudited)(1)(2)

        $ (0.49 )      
                   

Pro forma basic and diluted weighted average common shares outstanding (unaudited)(1)(2)

          33,273        
                   

 

 
  As of December 31, 2011  
 
  Actual   Pro
Forma
  Pro Forma
As Adjusted(3)
 
 
   
  (unaudited)
  (unaudited)
 
 
  (in thousands)
 

Balance Sheet Data:

                   

Cash and cash equivalents

  $ 39,825   $ 98,159        

Working capital

    38,835     97,169        

Total assets

    42,879     101,213        

Preferred stock

    64,348            

Total stockholders' (deficit) equity

    (25,068 )   97,614        

(1)
See Note 2 within the notes to our financial statements for a description of the method used to calculate basic and diluted net loss per common share and pro forma basic and diluted net loss per common share.

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(2)
Pro forma to reflect (1) the issuance of 26,884,442 shares of our Series B preferred stock on March 21, 2012 for net proceeds of approximately $58.3 million; and (2) the conversion of all outstanding shares of our preferred stock (including shares of our Series B preferred stock issued on March 21, 2012) into 67,936,761 shares of common stock immediately prior to the closing of this offering.

(3)
Pro forma as adjusted to further reflect the sale of            shares of our common stock offered in this offering, assuming an initial public offering price of $            per share, which is the midpoint of the price range set forth on the cover page of this prospectus, after deducting underwriting discounts and commissions and estimated offering expenses payable by us.

(4)
A $1.00 increase (decrease) in the assumed initial public offering price of $            per share, which is the midpoint of the price range set forth on the cover page of this prospectus, would increase (decrease) the pro forma as adjusted amount of each of cash and cash equivalents and total stockholders' (deficit) equity by approximately $             million, assuming that the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same, and after deducting underwriting discounts and commissions and estimated offering expenses payable by us. An increase of            shares in the number of shares offered by us together with a concomitant $1.00 increase in the assumed initial public offering price of $            per share, which is the midpoint of the price range set forth on the cover page of this prospectus, would increase each of cash and cash equivalents and total stockholders' (deficit) equity by approximately $             million after deducting underwriting discounts and commissions and any estimated offering expenses payable by us. Conversely, a decrease of            shares in the number of shares offered by us together with a concomitant $1.00 decrease in the assumed initial public offering price of $            per share, which is the midpoint of the price range set forth on the cover page of this prospectus, would decrease each of cash and cash equivalents and total stockholders' (deficit) equity by approximately $             million after deducting underwriting discounts and commissions and any estimated offering expenses payable by us.

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MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
AND RESULTS OF OPERATIONS

        You should read the following discussion and analysis of our financial condition and results of operations together with our consolidated financial statements and related notes appearing in this prospectus. Some of the information contained in this discussion and analysis or set forth elsewhere in this prospectus, including information with respect to our plans and strategy for our business and related financing, includes forward-looking statements that involve risks and uncertainties. As a result of many factors, including those factors set forth in the "Risk Factors" section of this prospectus, our actual results could differ materially from the results described in or implied by the forward-looking statements contained in the following discussion and analysis.

Overview

        We are an oncology-focused biopharmaceutical company dedicated to improving the lives of cancer patients. We have in-licensed and are currently developing two product candidates, rolapitant and TSR-011. We intend to continue to leverage the experience and competencies of our senior management team to identify, acquire, develop and commercialize cancer therapeutics and oncology supportive care products that are safer and more effective than existing treatments.

        Product Candidate Portfolio.    Our product candidate portfolio currently consists of two oncology-related product candidates:

    Rolapitant, a long-acting neurokinin-1, or NK-1, receptor antagonist currently in Phase 3 trials for the prevention of chemotherapy induced nausea and vomiting, or CINV; and

    TSR-011, an orally available anaplastic lymphoma kinase, or ALK, inhibitor (targeted anti-cancer agent) currently in preclinical development. We plan to test TSR-011 in clinical trials as a treatment for non-small cell lung cancer, or NSCLC, and potentially other cancer indications.

        Development Stage Operations.    We commenced business operations in March 2010. Our operations to date have been limited to organizing and staffing our company, business planning, raising capital, acquiring and developing product candidates, identifying potential product candidates and undertaking preclinical studies and clinical trials of our product candidates. To date, we have not generated any revenues and have financed our operations with net proceeds from private placements of our preferred stock.

        As of December 31, 2011, we had a deficit accumulated during the development stage of $25.4 million. Our net loss was $16.4 million for the year ended December 31, 2011 and $9.0 million for the period from March 26, 2010 (inception) to December 31, 2010. We expect to incur significant expenses and increasing operating losses for the foreseeable future. We expect our expenses to increase in connection with our ongoing activities, particularly as we continue the development and clinical trials of, and seek regulatory approval for, our product candidates. If we obtain regulatory approval for any of our product candidates, we expect to incur significant commercialization expenses related to product sales, marketing, manufacturing and distribution. Furthermore, upon the closing of this offering, we expect to incur additional costs associated with operating as a public company. Accordingly, we will seek to fund our operations through public or private equity or debt financings or other sources. Adequate additional financing may not be available to us on acceptable terms, or at all. Our failure to raise capital as and when needed would have a negative impact on our financial condition and our ability to pursue our business strategy. We expect that research and development expenses will increase as we continue the development of our product candidates and general and administrative costs will increase as we grow and operate as a public company. We will need to generate significant revenues to achieve profitability, and we may never do so.

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        Rolapitant.    In December 2010, we entered into a license agreement with OPKO Health, Inc., or OPKO, to obtain exclusive worldwide rights to research, develop, manufacture, market and sell rolapitant. In consideration for this license, we paid OPKO $6.0 million upon signing the agreement and issued 1,500,000 shares of our Series O preferred stock. At the time of this transaction, the fair value of our Series O preferred stock was determined to be approximately $0.6 million. We are also required to make milestone payments to OPKO of up to an aggregate of $30.0 million if specified regulatory approvals and initial commercial sales of rolapitant are made. In addition, we are required to make commercial milestone payments to OPKO of up to an aggregate of $85.0 million if specified annual net sales of rolapitant are achieved. If commercial sales of rolapitant commence, we will pay OPKO tiered royalties based on the amount of annual net sales achieved. We will share future profits from the commercialization, if any, by OPKO of licensed products in Japan, and OPKO retains an option to market the products in Latin America.

        We are responsible for all preclinical, clinical, regulatory and other activities necessary to develop and commercialize rolapitant. There were no ongoing clinical trials for rolapitant or the additional compound at the time of our acquisition of these rights. None of the assets to which we acquired rights have alternative future uses, nor have they reached a stage of technological feasibility. We accounted for this transaction as an asset acquisition because we did not acquire any processes or activities in addition to the license. We recorded the entire purchase price to acquired in-process research and development expense of $6.6 million.

        ALK Program.    In March 2011, we entered into a license agreement with Amgen, Inc., or Amgen, to obtain exclusive worldwide rights to research, develop, manufacture, market and sell certain licensed ALK inhibitor compounds. Under the terms of the license agreement, we made an up-front payment to Amgen of $0.5 million. We are also required to make milestone payments to Amgen of up to an aggregate of $138 million if specified clinical, regulatory approvals, initial commercialization and annual net product sales milestones are achieved. If commercial sales of a product commence, we will pay Amgen royalties based on cumulative net sales.

        We are responsible for all preclinical, clinical, regulatory and other activities necessary to develop and commercialize the ALK product candidates. At the time of the license transaction, ALK was a preclinical compound. None of the assets to which we acquired rights have alternative future uses, nor have they reached a stage of technological feasibility. We accounted for this transaction as an asset acquisition because we did not acquire any processes or activities in addition to the license. We recorded the entire purchase price to acquired in-process research and development expense of $0.5 million.

        Preferred Stock Financing.    Since our inception on March 26, 2010, we have funded our operations primarily through the private placement of our equity securities. As of December 31, 2011, we had received $62.1 million in net proceeds from the issuance of preferred stock. As of December 31, 2011, our principal source of liquidity was cash and cash equivalents, which totaled $39.8 million.

        Pursuant to the Series B Preferred Stock Purchase Agreement, dated as of June 6, 2011, and as amended on July 7, 2011 and March 21, 2012, we issued 26,884,442 shares of our Series B preferred stock to certain existing investors on March 21, 2012 for additional net proceeds of approximately $58.3 million.

Financial Operations Overview

        The financial information presented from March 26, 2010 (inception) to December 31, 2010 is based solely on the results of TESARO, Inc. Subsequent to January 1, 2011, the financial information is consolidated and includes the results of our wholly owned subsidiary in the United Kingdom. All intercompany transactions and balances are eliminated in this consolidation.

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Revenue

        To date, we have not generated any revenues. Our ability to generate revenue and become profitable depends upon our ability to successfully commercialize products, including either or both of our product candidates that we have in-licensed, rolapitant and TSR-011, or other products or product candidates that we may in-license or acquire in the future. We expect to incur losses for the foreseeable future, and we expect these losses to increase as we continue our development of, and seek regulatory approvals for, our product candidates, and begin to commercialize any approved products. Because of the numerous risks and uncertainties associated with product development, we are unable to predict the timing or amount of increased expenses, or when or if we will be able to achieve or maintain profitability. Even if we are able to generate revenues from the sale of our products, we may not become profitable. If we fail to become profitable or are unable to sustain profitability on a continuing basis, then we may be unable to continue our operations at planned levels and be forced to reduce our operations.

Research and Development Expenses

        Research and development expenses consist primarily of costs incurred for the development of our product candidates, which include:

    license fees related to the acquisition of in-licensed products, which are reported on our statements of operations as acquired in-process research and development;

    employee-related expenses, including salaries, benefits, travel and stock-based compensation expense;

    expenses incurred under agreements with contract research organizations, or CROs, and investigative sites that conduct our clinical trials and preclinical studies;

    the cost of acquiring, developing and manufacturing clinical trial materials;

    facilities, depreciation and other expenses, which include direct and allocated expenses for rent and maintenance of facilities, insurance and other supplies; and

    costs associated with preclinical activities and regulatory operations.

        Research and development costs are expensed as incurred. License fees and milestone payments related to in-licensed products and technology are expensed if it is determined that they have no alternative future use. Costs for certain development activities, such as clinical trials, are recognized based on an evaluation of the progress to completion of specific tasks using data such as patient enrollment, clinical site activations or information provided to us by our vendors.

        Research and development activities are central to our business model. Product candidates in later stages of clinical development generally have higher development costs than those in earlier stages of clinical development, primarily due to the increased size and duration of later-stage clinical trials. We plan to increase our research and development expenses for the foreseeable future. Our costs associated with rolapitant will increase as we continue to enroll our Phase 3 clinical trials and continue the development of both the oral and intravenous formulations. We expect costs associated with TSR-011 to increase as we expand the development activities for this program.

        We cannot determine with certainty the duration and completion costs of the current or future clinical trials of our product candidates or if, when, or to what extent we will generate revenues from the commercialization and sale of any of our product candidates that obtain regulatory approval. We may never succeed in achieving regulatory approval for any of our product candidates. The duration, costs and timing of clinical trials and development of our product candidates will depend on a variety of factors, including the uncertainties of future clinical and preclinical studies, uncertainties in clinical

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trial enrollment rate and significant and changing government regulation. In addition, the probability of success for each product candidate will depend on numerous factors, including competition, manufacturing capability and commercial viability. We will determine which programs to pursue and how much to fund each program in response to the scientific and clinical success of each product candidate, as well as an assessment of each product candidate's commercial potential.

General and Administrative Expenses

        General and administrative expenses consist principally of salaries and related costs for personnel, including stock-based compensation and travel expenses, in executive and other administrative functions. Other general and administrative expenses include facility related costs, communication expenses and professional fees for legal, patent review, consulting and accounting services.

        We anticipate that our general and administrative expenses will increase in the future with the continued research and development and potential commercialization of our product candidates and as we operate as a public company. These increases will likely include increased costs for insurance, costs related to the hiring of additional personnel and payments to outside consultants, lawyers and accountants, among other expenses. Additionally, if and when we believe a regulatory approval of the first product candidate appears likely, we anticipate an increase in payroll and expense as a result of our preparation for commercial operations, especially as it relates to the sales and marketing of our product candidates.

Other Income and Expense

        Other income and expense consists of interest income earned on cash and cash equivalents and expense related to the issuance of certain rights to Series A-1 preferred stock investors to purchase shares of Series A-2 preferred stock, or the Series A-2 Purchase Rights. The Series A-2 Purchase Rights provided for the purchase of preferred stock which was deemed to be legally detachable and separately exercisable, and therefore represented free-standing financial instruments which were accounted for as a liability. We recorded the fair value of the Series A-2 Purchase Rights at the date of issuance of the Series A-1 preferred stock and adjusted the carrying value of such rights to their estimated fair value at each reporting date. The estimated fair value was determined using a valuation model which considers the probability of achieving defined milestones, our cost of capital, the estimated period the Series A-2 Purchase Rights would be outstanding, consideration received for the instrument with such rights, the number of shares to be issued to satisfy such rights and at what price and any changes in the fair value of the underlying instrument to such rights. From the date of issuance to December 31, 2010 the estimated change in fair value of the Series A-2 Purchase Rights was $0.7 million. On February 10, 2011, the holders of the Series A-2 Purchase Rights exercised such rights. From January 1, 2011 to February 10, 2011, the estimated change in the fair value of the Series A-2 Purchase Rights resulted in other expense of $1.0 million.

Critical Accounting Policies and Significant Judgments and Estimates

        Our management's discussion and analysis of our financial condition and results of operations are based on our financial statements, which have been prepared in accordance with U.S. generally accepted accounting principles. The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities and expenses and the disclosure of contingent assets and liabilities in our financial statements. On an ongoing basis, we evaluate our estimates and judgments, including those related to accrued expenses and stock-based compensation. We base our estimates on historical experience, known trends and events and various other factors that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

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        While our significant accounting policies are described in more detail in the notes to our financial statements appearing elsewhere in this prospectus, we believe the following accounting policies to be most critical to the judgments and estimates used in the preparation of our financial statements.

Accrued Research and Development Expenses

        As part of the process of preparing our financial statements, we are required to estimate our accrued expenses. This process involves reviewing open contracts and purchase orders, communicating with our personnel to identify services that have been performed on our behalf and estimating the level of service performed and the associated cost incurred for the service when we have not yet been invoiced or otherwise notified of the actual cost. The majority of our service providers invoice us monthly in arrears for services performed or when contractual milestones are met. We make estimates of our accrued expenses as of each balance sheet date in our financial statements based on facts and circumstances known to us at that time. We periodically confirm the accuracy of our estimates with the service providers and make adjustments if necessary. Examples of estimated accrued research and development expenses include fees paid to:

    CROs in connection with clinical studies;

    investigative sites in connection with clinical studies;

    vendors in connection with preclinical development activities; and

    vendors related to product manufacturing, development and distribution of clinical supplies.

        We base our expenses related to clinical studies on our estimates of the services received and efforts expended pursuant to contracts with multiple CROs that conduct and manage clinical studies on our behalf. The financial terms of these agreements are subject to negotiation, vary from contract to contract and may result in uneven payment flows. There may be instances in which payments made to our vendors will exceed the level of services provided and result in a prepayment of the clinical expense. Payments under some of these contracts depend on factors such as the successful enrollment of subjects and the completion of clinical trial milestones. In accruing service fees, we estimate the time period over which services will be performed, enrollment of subjects, number of sites activated and the level of effort to be expended in each period. If the actual timing of the performance of services or the level of effort varies from our estimate, we adjust the accrual or prepaid accordingly. Although we do not expect our estimates to be materially different from amounts actually incurred, if our estimates of the status and timing of services performed differs from the actual status and timing of services performed we may report amounts that are too high or too low in any particular period.

Net Operating Loss Carryforwards

        As of December 31, 2011, we have federal net operating loss carryforwards of $16.5 million to offset future federal income taxes. We also have federal research and development tax credit carryforwards of $0.3 million to offset future federal income taxes. The federal net operating loss carryforwards and research and development tax credit carryforwards expire at various times through 2031. Net operating loss and tax credit carryforwards are subject to review and possible adjustment by the Internal Revenue Service and state tax authorities and may become subject to an annual limitation in the event of certain cumulative changes in the ownership interest of significant stockholders over a three-year period in excess of 50%, as defined under Sections 382 and 383 of the United States Internal Revenue Code of 1986, as amended, as well as similar state provisions. This could limit the amount of tax attributes that can be utilized annually to offset future taxable income or tax liabilities. The amount of the annual limitation is determined based on the value of our company immediately prior to the ownership change. Subsequent ownership changes may further affect the limitation in future years. At December 31, 2011, we recorded a 100% valuation allowance against our net operating

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loss and research and development tax credit carryforwards, as we believe it is more likely than not that the tax benefits will not be fully realized. In the future, if we determine that a portion or all of the tax benefits associated with our tax carryforwards will be realized, net income would increase in the period of determination.

Stock-Based Compensation

        We recognize compensation costs related to stock options and shares of restricted stock granted to employees based on the estimated fair value of the awards on the date of grant, net of estimated forfeitures. Described below is the methodology we have utilized in measuring stock-based compensation expense. Following the consummation of this offering, stock option and restricted stock values will be determined based on the quoted market price of our common stock.

        Since our inception in March 2010, we have applied the fair value recognition provisions of Financial Accounting Standards Board Accounting Standards Codification Topic 718, Compensation-Stock Compensation, which we refer to as ASC 718. Determining the amount of stock-based compensation to be recorded requires us to develop estimates of the fair value of stock-based awards as of their grant date. Stock-based compensation expense is recognized ratably over the requisite service period, which in most cases is the vesting period of the award. Calculating the fair value of stock-based awards requires that we make highly subjective assumptions. We use the Black-Scholes option pricing model to value our stock option awards. Use of this valuation methodology requires that we make assumptions as to the volatility of our common stock, the expected term of our stock options, the risk free interest rate for a period that approximates the expected term of our stock options and our expected dividend yield. Because we are a privately-held company with a limited operating history, we utilize data from representative peer companies to estimate expected stock price volatility. We selected peer companies from the biopharmaceutical industry with similar characteristics as us, including stage of product development, market capitalization, number of employees and therapeutic focus. We use the simplified method as prescribed by the Securities and Exchange Commission Staff Accounting Bulletin No. 107, Share-Based Payment as we do not have sufficient historical exercise data to provide a reasonable basis upon which to estimate the expected term of stock options granted to employees. We utilize a dividend yield of zero based on the fact that we have never paid cash dividends and have no current intention to pay cash dividends. The risk-free interest rate used for each grant is based on the U.S. Treasury yield curve in effect at the time of grant for instruments with a similar expected life.

        The following table presents the grant dates and related exercise or purchase prices of stock options granted and restricted stock awards, or RSAs, issued to our employees from March 26, 2010 (inception) through December 31, 2011, along with the corresponding exercise price for each option grant and the fair value per share utilized to calculate stock-based compensation expense.

Date of grant
  Type of
Award
  Number of shares
underlying
awards granted
  Exercise price
(options) or
purchase price
(restricted stock)
per share
  Common stock
fair value
per share on
grant date
 

September 21, 2010

  Option     50,000   $ 0.01   $ 0.01  

February 7, 2011

  RSA     660,000   $   $ 0.15  

June 6, 2011

  Option     165,000   $ 0.38   $ 0.92  

July 19, 2011

  Option     2,512,500   $ 0.38   $ 0.92  

September 29, 2011

  Option     125,000   $ 0.38   $ 0.92  

December 8, 2011

  Option     275,000   $ 0.38   $ 1.42  

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        The fair value of stock options was estimated at the grant date using the following assumptions:

 
  Period from
March 26
(Inception)
Through
December 31,
2010
  Year Ended December 31,
2011

Dividend yield

   

Volatility

  82%   67–68%

Risk-free interest rate

  2.06%   1.07–2.03%

Expected term (years)

  6.25   6.25

        Stock-based compensation was insignificant for the period March 26, 2010 (inception) through December 31, 2010 and totaled $305,000 for the year ended December 31, 2011. As of December 31, 2011, we had $2.2 million of total unrecognized compensation expense, net of related forfeiture estimates, which is expected to be recognized over a weighted-average remaining vesting period of approximately 3.5 years. While our stock-based compensation for stock options and restricted stock granted to employees to date has not been significant, historically, we expect the impact to grow in future periods due to the potential increases in the value of our common stock and headcount.

        Under ASC 718, we are required to estimate the level of forfeitures expected to occur and record compensation expense only for those awards that we ultimately expect will vest. Due to the lack of historical forfeiture activity of our plan, we expect to estimate our forfeiture rate based on peer company data with characteristics similar to our company. For the period from March 26, 2010 (inception) through December 31, 2011, we used a forfeiture rate of 0. There have been no forfeitures through December 31, 2011.

        We have historically granted stock options at exercise prices not less than the fair value of our common stock. As there has been no public market for our common stock to date, the estimated fair value of our common stock has been determined contemporaneously by our board of directors based on valuation estimates provided by management and prepared in accordance with the framework of the AICPA Technical Practice Aid, Valuation of Privately-Held-Company Equity Securities Issued as Compensation, or the Practice Aid. Our contemporaneous valuations of our common stock as of September 21, 2010, December 31, 2010 and June 6, 2011 were based on a number of objective and subjective factors, including external market conditions affecting the biotechnology industry sector and the prices at which we sold shares of preferred stock, the superior rights and preferences of securities senior to our common stock at the time of each grant and the likelihood of achieving a liquidity event such as an initial public offering or the sale of our company.

        As of September 21, 2010, our board of directors determined the fair value of our common stock to be $0.01 per share. We granted options to purchase 50,000 shares of our common stock with an exercise price of $0.01 during this time. Based on the valuation methodology selection criteria set forth in the Practice Aid, with a focus on the early stage of our development as a company we determined that an asset-based approach was the most appropriate method to use to determine the enterprise value of our company. We then allocated the enterprise value using the current value method. We concluded that this was the most appropriate method since we had not yet acquired a product candidate for development, no material progress had been made on the enterprise's business plan and there was no reasonable basis for estimating the amount and timing of any such common equity value above the liquidation preference of the Series A preferred stock. As such, we believe an income approach would not have provided a reliable fair value determination. In addition, as a result of the lack of comparative information available for publicly-traded or privately-held start-up enterprises, and because any investments in shares of stock are unlikely to be a reliable indicator of fair value at such an early stage, we concluded that the market approach would also not provide a reliable fair value

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determination as of this date. The results of this valuation methodology were consistent with our expectations, as we would not have expected any significant value to have been created for the common stockholders.

        In December 2010, we completed the in-licensing of our first product candidate, rolapitant. Due to the significance of this transaction, we deemed it appropriate to update the estimated fair value of our common stock. Our board of directors determined the fair value of our common stock to be $0.15 per share as of December 1, 2010 based on our December 31, 2010 contemporaneous valuation. The increase in value from November 30, 2010 was primarily due to the in-license of rolapitant in December 2010. We issued 660,000 shares of restricted stock on February 7, 2011. We concluded that there were no significant transactions affecting our capital structure or significant developments in our research and development activities that would have indicated that an update to our valuation was required for the restricted stock awards issued on February 7, 2011. Based on the valuation methodology selection criteria set forth in the Practice Aid, the stage of our product candidate as of December 31, 2010 and the fact that rolapitant was our sole product candidate, we determined that the Income Approach using a discounted cash flow, or DCF, analysis was the most appropriate valuation methodology to estimate the fair value of our common stock. Our DCF used the probability weighted average of three cash flow scenarios prepared by our management: (i) 70%—base case; (ii) 10%—best case and (iii) 20%—low case.

        In March 2011, we entered into a license agreement with Amgen, Inc., or Amgen, to obtain exclusive worldwide rights to research, develop, manufacture, market and sell licensed ALK inhibitor compounds. In June and July of 2011, we completed the initial closing of our Series B preferred stock financing, which included several unrelated investors. Based on the significance of these transactions, we deemed it appropriate to perform a contemporaneous valuation of our common stock as of June 6, 2011. For the period from June 1, 2011 to December 31, 2011, our board of directors determined the fair value of our common stock to be $0.38 per share.

        In February 2012, our board of directors authorized management to pursue this initial public offering, or IPO, with a targeted completion date of June 2012. As a result, in connection with the preparation of our consolidated financial statements for the year ended December 31, 2011 and in preparing for our proposed IPO, we reexamined the valuation of our common stock during 2011. In connection with that reexamination, we prepared a retrospective valuation report of the fair value of our common stock for financial reporting purposes as of June 30, 2011 and a contemporaneous valuation report as of December 31, 2011. We believe that the valuation methodologies used in the retrospective and contemporaneous valuation reports are reasonable and consistent with the Practice Aid. We also believe the that preparation of the retrospective valuation as of June 30, 2011 was necessary due to the fact that the timeframe for our potential IPO had accelerated significantly since the time of our initial contemporaneous valuation.

        For our retrospective valuation as of June 30, 2011, we used the hybrid method to estimate the fair value of our common stock. The hybrid method includes three potential liquidity scenarios and then probability weights the resulting valuation under each of these scenarios. The three liquidity scenarios assumed were as follows:

    complete our proposed IPO, or the IPO scenario;

    remain as a private company and execute an IPO a year later than the IPO scenario, or the Delayed IPO scenario; and

    remain as a private company with a liquidity event several years out, or the M&A scenario.

        In order to estimate our equity value under the IPO scenario and Delayed IPO scenario, we selected guideline public companies, or GPC, that had product candidates in Phase 2 or Phase 3 clinical trials. We concluded that these companies were most comparable to our stage of development

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based on the status of our clinical programs. We selected an expected market capitalization based upon our estimated invested capital at the time of our IPO multiplied by the GPC's median multiple of paid in capital. This future equity value was discounted to present value and then discounted for lack of marketability and this equity value was applied to the number of common shares outstanding determined on a fully diluted basis to calculate the per share fair value of our common stock, assuming the conversion of all preferred stock into common stock as such a conversion would be required to execute an IPO.

        In order to estimate our equity value under the M&A scenario and as a result of our Series B financing to existing and unrelated investors in June and July 2011, we utilized the reverse backsolve option pricing method to value our common stock under the M&A scenario. The value assigned to our common stock, for the M&A scenario, was determined using a break point analysis to estimate the various enterprise values at which holders of each series of our preferred stock would elect to convert to common stock and the points at which holders of options would exercise as a result of the value of the common stock exceeding the exercise price.

        The following table summarizes the significant assumptions utilized for each of the valuation scenarios used in the hybrid method to determine the fair value of our common stock as of June 30, 2011.

 
   
  Liquidity Scenario
 
   
  IPO   Delayed IPO   M&A Scenario

Key Assumptions

           

Probability weighting

  15%   15%   70%

Liquidity date

  6/30/2012   6/30/2013   12/31/2014

Underlying equity value ($ millions)

  $179   $204   $65

WACC

  24.90%   24.90%   NA

Volatility

  NA   NA   67%

Risk free interest rate

  NA   NA   1.29%

Discount for lack of marketability

  25%   25%   25%

Estimated per-share fair value of common stock

  $1.44   $1.31   $0.73

        The estimated per share fair value of our common stock calculated in our retrospective valuation as of June 30, 2011 of $0.92 per share increased significantly from the December 31, 2010 valuation of $0.15 per share. This is primarily due to the following factors:

    we entered into a license agreement with Amgen, in March 2011 to obtain exclusive worldwide rights to research, develop, manufacture, market and sell licensed ALK inhibitor compounds; and

    our improved financial position resulting from the issuance of 10.0 million shares in February 2011 of our Series A preferred stock for an aggregate purchase price of $10.0 million and the issuance of 19.6 million shares of our Series B preferred stock for an aggregate purchase price of $42.5 million.

        The fair value of our common stock at December 31, 2011 was determined using the Market Approach and a probability-weighted analysis of the present value of the returns afforded to our shareholders under each of four possible future scenarios. Three of the scenarios assume a shareholder exit, either through an IPO or a sale of our company. The fourth scenario assumes a liquidation or dissolution of our company at a value that is equal to the cumulative amounts invested by our preferred shareholders. For the IPO and sale scenarios, the estimated future and present values of our common stock were calculated using assumptions including: the expected market capitalization or sale valuations determined using the Market Approach; the expected dates of the future expected IPO or sale; and an appropriate risk-adjusted discount rate. For the dissolution or liquidation scenario, the

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estimated future and present values of our common stock were calculated using assumptions including: the aggregate liquidation preference of our preferred stock; the expected date of the future dissolution and an appropriate risk-adjusted discount rate. Finally, the present value calculated for our common stock under each scenario was probability weighted based on our estimate of the relative occurrence of each scenario.

        In our contemporaneous valuation for December 31, 2011, our estimates of the probability of occurrence for the four potential future outcomes were as follows: (i) we become a public company in June 2012 (IPO scenario)—45%; (ii) we become a public company in late 2013 (Delayed IPO scenario)—15%; (iii) we are acquired for a premium in late 2013 (Sale at Premium scenario)—15%; and (iv) we are acquired for an amount equal to the aggregate liquidation preference of our preferred stock in late 2013 (Sale at a Discount scenario)—25%.

        As of December 31, 2011, we used the Market Approach to estimate the future expected market capitalization of our company. In applying the Market Approach in the IPO scenarios we applied the Guideline Public Company Method as described in the Practice Aid. We began by analyzing initial public offerings of biotechnology companies between January 1, 2010 and November 30, 2011. More specifically, we selected guideline companies that completed their initial public offerings in 2010 or 2011 and had drug candidates beyond Phase 2 clinical trials. We concluded that these companies were most comparable to our stage of development based upon the status of our clinical programs.

        In the IPO scenario, we estimated an expected enterprise value of $177 million which was based upon the average of the multiple of invested capital at the time of the IPO for a group of IPO and GPCs as there was no single company in this group that was more representative of our size and stage of development than the others. In the Delayed IPO scenario, we estimated an expected enterprise value of $200 million which was based on the average of the multiple of invested capital at the time of the IPO for a group IPO companies that were at the higher end of the multiple of invested capital. We selected the higher end of multiple range because in this scenario we expect to have a higher enterprise value after we receive Phase 3 results from our lead product candidate.

        In applying the Market Approach in the Sale at a Premium scenario, we selected a sale price of $260 million that represented a premium of 30% above the enterprise value determined in the Delayed IPO scenario.

        In applying the Market Approach in the Sale at a Discount scenario, we assumed a sale price of $122 million which represents the aggregate liquidation preference of our preferred stock.

        In order to allocate the enterprise values determined using the Market Approach to our common stock, we used the probability adjusted expected return method, or PWERM, described in the Practice Aid. Under this method, the value of our common stock is estimated based upon an analysis of future values for our company assuming various future outcomes, the timing of which is based on the plans of our board of directors and management. Share value is based on the probability-weighted present value of expected future investment returns, considering each of the possible outcomes available to us as well as the rights of each share class.

        The fair value of our common stock was determined to be $1.42 on December 31, 2011. The increase in fair value per share from the June 30, 2011 retrospective valuation of $0.92 per share was primarily due to the following:

    the probability of a near term liquidity event (IPO) had increased from 15% to 45%;

    we had entered into arrangements with our key vendors for our Phase 3 clinical program for rolapitant;

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    interest from the investment banking community had increased as a result of the status and timing of our Phase 3 clinical program for rolapitant; and

    we hired seven additional employees to our development team.

        On June     , 2012, we and our underwriters determined the estimated price range for this offering, as set forth on the cover page of this prospectus. The midpoint of the price range is $            per share. In comparison, our estimate of the fair value of our common stock was $            per share as of March 30, 2012. We note that, as is typical in IPOs, the estimated price range for this offering was not derived using a formal determination of fair value, but was determined by negotiation between us and the underwriters. Among the factors that were considered in setting this range were our prospects and the history of and prospects for our industry, the general condition of the securities markets and the recent market prices of, and the demand for, publicly-traded common stock of generally comparable companies. Specifically, we believe that the difference between the fair value of our common stock as of March 30, 2012 and the midpoint of the estimated price range for this offering is primarily the result of the following factors:                                                 .

        There are significant judgments and estimates inherent in the determination of these valuations. These judgments and estimates include assumptions regarding our future performance, including the successful completion of our clinical trials as well as the determination of the appropriate valuation methods. If we had made different assumptions, our stock-based compensation expense could have been different. The foregoing valuation methodologies are not the only methodologies available and they will not be used to value our common stock once this offering is complete. We cannot make assurances as to any particular valuation for our common stock. Accordingly, investors are cautioned not to place undue reliance on the foregoing valuation methodologies as an indicator of future stock prices.

Results of Operations

        We were incorporated on March 26, 2010. As a result, our results of operations reflect the period from March 26, 2010 (inception) to December 31, 2010 and the year ended December 31, 2011. Consequently, amounts for the period from March 26, 2010 (inception) to December 31, 2010 reflect only a partial year activity.

Comparison of the Year Ended December 31, 2011 to the Period from March 26, 2010 (Inception) to December 31, 2010:

 
  Period from
March 26, 2010
(inception) to
December 31,
2010
  Year Ended
December 31,
2011
  Increase
(Decrease)
 
 
   
  (In Thousands)
   
 

Expenses:

                   

Research and development

  $ 46   $ 11,768   $ 11,722  

General and administrative

    1,668     3,158     1,490  

Acquired in-process research and development

    6,630     500     (6,130 )
               

Total expenses

    8,344     15,426     7,082  

Loss from operations

    (8,344 )   (15,426 )   7,082  

Other income (expense), net

    (631 )   (972 )   341  
               

Net loss

  $ (8,975 ) $ (16,398 ) $ 7,423  
               

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        Revenues.    We did not recognize any revenue for the year ended December 31, 2011 or the period from March 26, 2010 (inception) to December 31, 2010.

        Research and Development Expenses.    Research and development expenses were $11.8 million for the year ended December 31, 2011, compared to $46,000 for the period from March 26, 2010 (inception) to December 31, 2010, an increase of $11.7 million. The increase was primarily due to the development expenses related to the development of our in-licensed product candidates, rolapitant and TSR-011. Significant 2011 activities causing the increase in expense included:

    an increase of $9.0 million for rolapitant related to the costs for clinical trials and preparations for the Phase 3 clinical program including drug product development, clinical supply manufacturing and distribution;

    an increase of $0.7 million associated with TSR-011 product development and IND enabling studies; and

    an increase of $2.0 million to salaries, benefits and other personnel costs to support the growth in our 2011 development activities.

        The following table identifies research and development expenses and acquired in-process research and development expenses on a program-specific basis for our product candidates in-licensed through December 31, 2011. Personnel-related costs, depreciation and stock-based compensation are not allocated to a program, as they are deployed across multiple projects under development and, as such, are separately classified as personnel and other expenses in the table below (in thousands).

 
  Period from
March 26, 2010
(inception) to
December 31,
2010
  Year Ended
December 31,
2011
  Period from
March 26, 2010
(inception) to
December 31,
2011
 

Rolapitant Expenses

                   

Acquired in-process R&D

  $ 6,630   $   $ 6,630  

Research and development

    14     9,041     9,055  
               

Rolapitant total

    6,644     9,041     15,685  

TSR-011 Expenses

                   

Acquired in-process R&D

        500     500  

Research and development

        688     688  
               

TSR-011 total

        1,188     1,188  

Personnel and Other Expenses

    32     2,039     2,071  
               

Total

  $ 6,676   $ 12,268   $ 18,944  
               

        General and Administrative Expenses.    General and administrative expenses for the year ended December 31, 2011 were $3.2 million compared to $1.7 million for the period from March 26, 2010 (inception) to December 31, 2010, an increase of $1.5 million. The increase was due primarily to an increase of $1.0 million in professional and consulting fees and $0.5 million in personnel related expenses to support corporate operational activities and the increased research and development activities in 2011.

        Acquired In-Process Research and Development Expenses.    Acquired in-process research and development expenses were $0.5 million for the year ended December 31, 2011, compared to $6.6 million for the period from March 26, 2010 (inception) to December 31, 2010, a decrease of approximately $6.1 million. The decrease was primarily due to the difference in up-front acquisition costs associated with the acquisition of licensing rights for our ALK program in March 2011 compared

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with the acquisition costs for the licensing rights to rolapitant in December 2010. We paid $0.5 million in cash and recognized $0.5 million as acquired in-process research and development expense to acquire the licensing rights to our ALK program for the year ended December 31, 2011. For the period from March 26, 2010 (inception) to December 31, 2010, we paid $6.0 million in cash and issued 1,500,000 shares of our Series O preferred stock to acquire the licensing rights to rolapitant. At the time of the acquisition of the licensing rights to rolapitant, the fair value of our Series O preferred stock was determined to be $0.6 million. As a result, we recognized $6.6 million as acquired in-process research and development expense for the period from March 26, 2010 (inception) to December 31, 2010

        Other Income (Expense), Net.    Other income (expense), net was $1.0 million for the year ended December 31, 2011, compared to $0.6 million for the period from March 26, 2010 (inception) to December 31, 2010, an increase of approximately $0.4 million. The increase was primarily due to change in value of the Series A-2 Purchase Rights issued in connection with the issuance of 10,000,000 shares of Series A-1 preferred stock on May 10, 2010. The Company recorded the fair value of the Series A-2 Purchase Rights at the date of issuance of the Series A-1 preferred stock and adjusted the carrying value of such rights to their estimated fair value at each reporting date. From the date of issuance to December 31, 2010 the estimated change in fair value of the Series A-2 Purchase Rights was $0.7 million. On February 10, 2011, the holders of the Series A-2 Purchase Rights exercised such rights. From January 1, 2011 to February 10, 2011, the estimated change in fair value of the Series A-2 Purchase Rights was $1.0 million.

Liquidity and Capital Resources

        To date, we have not generated any revenue. Since our inception on March 26, 2010, we have funded our operations primarily through the private placement of our equity securities. As of December 31, 2011, we have received $62.1 million in net proceeds from the issuance of preferred stock. As of December 31, 2011, our principal source of liquidity was cash and cash equivalents, which totaled $39.8 million.

        In connection with the Series B Purchase Agreement, dated as of June 6, 2011, and as amended on July 7, 2011 and March 21, 2012, we issued 26,884,442 shares of our Series B preferred stock to certain existing investors on March 21, 2012 for additional net proceeds of approximately $58.3 million.

Cash Flows

        The following table sets forth the primary sources and uses of cash for each of the periods set forth below (in thousands):

 
  Period from
March 26, 2010
(inception) to
December 31,
2010
  Year Ended
December 31,
2011
 

Net cash used in operating activities

  $ (1,231 ) $ (14,141 )

Net cash used in investing activities

    (6,162 )   (698 )

Net cash provided by financing activities

    9,926     52,131  
           

Net increase in cash and cash equivalents

  $ 2,533   $ 37,292  
           

        Operating Activities.    The use of cash in all periods resulted primarily from our net losses adjusted for non-cash charges and favorable changes in components of working capital. The significant increase in cash used in operating activities for the year ended December 31, 2011 compared to the period from March 26, 2010 (inception) to December 31, 2010 is primarily due to an increase in research and

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development expenses as we continued to develop rolapitant and TSR-011, including an increase in development personnel, increased spending on external research and development costs offset by increases in the balance of accounts payable and accrued expenses. In addition, we commenced operations in March 2010 and, as such, the period ended December 31, 2010 reflects only a partial year of activity. We expect cash used in operating activities to continue to increase for the foreseeable future as we fund our increased development activities.

        Investing Activities.    The cash used in investing activities for all periods primarily reflects the $0.5 million up front cash payment for the ALK program license and the $6.0 million up front cash payment for the rolapitant license agreement for the year ended December 31, 2011 and the period from March 26, 2010 (inception) to December 31, 2010, respectively.

        Financing Activities.    The cash provided by financing activities for the period from March 26, 2010 (inception) to December 31, 2010 is the result of the sale and issuance of 10,000,000 shares of our Series A-1 preferred stock for net proceeds of $9.9 million. The cash provided by financing activities for the year ended December 31, 2011 is the result of the sale and issuance of 10,000,000 shares of our Series A-2 preferred stock for net proceeds of $10.0 million, and the sale and issuance of 19,552,319 shares of our Series B preferred stock for net proceeds of $42.1 million.

Operating Capital Requirements

        Assuming that we successfully complete clinical trials and obtain the requisite regulatory approvals, we do not anticipate commercializing any of our product candidates until 2014 at the earliest. We anticipate that we will continue to generate losses for the foreseeable future, and we expect the losses to increase as we continue the development of, and seek regulatory approvals for, our product candidates, and begin to commercialize any approved products. We are subject to all of the risks incident in the development of new biopharmaceutical products, and we may encounter unforeseen expenses, difficulties, complications, delays and other unknown factors that may adversely affect our business.

        Pursuant to the Series B Purchase Agreement, dated as of June 6, 2011, and as amended on July 7, 2011 and March 21, 2012, we issued 26,884,442 shares of our Series B preferred stock to certain existing investors on March 21, 2012 for additional net proceeds of approximately $58.3 million. We believe that the net proceeds from this offering together with existing cash and cash equivalents and interest thereon will be sufficient to fund our projected operating requirements for at least the next 12 months. However, we may require additional capital for the further development and commercialization of our product candidates and may also need to raise additional funds sooner to pursue our strategy of in-licensing or acquiring additional product candidates.

        Until we can generate a sufficient amount of revenue from our products, if ever, we expect to finance future cash needs through public or private equity or debt offerings. Additional capital may not be available on reasonable terms, if at all. If we are unable to raise additional capital in sufficient amounts or on terms acceptable to us we may have to significantly delay, scale back or discontinue the development or commercialization of one or more of our product candidates. If we raise additional funds through the issuance of additional debt or equity securities it could result in dilution to our existing stockholders, increased fixed payment obligations and these securities may have rights senior to those of our common stock and could contain covenants that would restrict our operations and potentially impair our competitiveness, such as limitations on our ability to incur additional debt, limitations on our ability to acquire, sell or license intellectual property rights and other operating restrictions that could adversely impact our ability to conduct our business. Any of these events could significantly harm our business, financial condition and prospects.

        Our forecast of the period of time through which our financial resources will be adequate to support our operations is a forward-looking statement and involves risks and uncertainties, and actual

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results could vary as a result of a number of factors. We have based this estimate on assumptions that may prove to be wrong, and we could utilize our available capital resources sooner than we currently expect. Our future funding requirements, both near and long-term, will depend on many factors, including, but not limited to:

    the initiation, progress, timing, costs and results of clinical trials for our product candidates and future product candidates we may in-license, including our Phase 3 clinical trials for rolapitant;

    the attainment of milestones and our need to make royalty payments to OPKO or Amgen, or to any other future product candidate licensor, if any, under our in-licensing agreements;

    the number and characteristics of product candidates that we in-license and develop;

    the outcome, timing and cost of regulatory approvals by the FDA and comparable foreign regulatory authorities, including the potential for the FDA or comparable foreign regulatory authorities to require that we perform more studies than those that we currently expect;

    the cost of filing, prosecuting, defending and enforcing any patent claims and other intellectual property rights;

    the effect of competing technological and market developments;

    the cost and timing of completion of commercial-scale outsourced manufacturing activities; and

    the cost of establishing sales, marketing and distribution capabilities for rolapitant or any product candidates for which we may receive regulatory approval.

        If a lack of available capital results in an inability to expand our operations or otherwise capitalize on our business opportunities, our business, financial condition and results of operations could be materially adversely affected.

Contractual Obligations and Commitments

        The following table summarizes our contractual obligations at December 31, 2011 (in thousands):

 
  Total   Less than
1 Year
  1 to 3
Years
  3 to 5
Years
  More than
5 Years
 

Operating lease obligations(1)

  $ 220   $ 176   $ 44          

(1)
In October 2011, we entered into an agreement to lease 13,576 square-feet of office space in Waltham, Massachusetts, which serves as our corporate headquarters. The lease will terminate in March 2013.

        In addition to the amounts set forth in the table above, we have certain obligations under licensing agreements with third parties contingent upon achieving various development, regulatory and commercial milestones. Pursuant to our license agreement with OPKO, we may be required to pay OPKO up to an aggregate of $30.0 million if certain regulatory approvals and initial commercial sales of rolapitant are made. Further, we are required to pay OPKO up to an aggregate of $85.0 million in commercial milestone payments if specified annual net sales of rolapitant are achieved. Pursuant to our license agreement with Amgen for the development and commercialization of TSR-011, we are also required to pay Amgen an aggregate of up to $138 million if specified clinical, regulatory approvals, initial commercialization and annual net product sales milestones are achieved. Finally, pursuant to terms of each of these license agreements, when and if commercial sales of a product commence, we will pay royalties to our licensors on net sales of the respective products.

        Additionally, we are required to pay up to $350,000 to a manufacturing supplier if certain regulatory approvals are achieved.

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Off-Balance Sheet Arrangements

        We did not have during the periods presented, and we do not currently have, any off-balance sheet arrangements, as defined in the rules and regulations of the Securities and Exchange Commission.

Quantitative and Qualitative Disclosures about Market Risks

        We are exposed to market risk related to changes in interest rates. As of December 31, 2010 and December 31, 2011, we had cash and cash equivalents of $2.5 million and $39.8 million, respectively, consisting primarily of money market funds. Our primary exposure to market risk is interest rate sensitivity, which is affected by changes in the general level of United States interest rates, particularly because our investments are in short-term securities. Our available for sale securities are subject to interest rate risk and will fall in value if market interest rates increase. Due to the short-term duration of our investment portfolio and the low risk profile of our investments, an immediate 100 basis point change in interest rates would not have a material effect on the fair market value of our portfolio.

Recently Adopted Accounting Standards

        We have not recently adopted any new accounting standards. There are no recently issued accounting standards that have a material impact on us.

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BUSINESS

Overview

        We are an oncology-focused biopharmaceutical company dedicated to improving the lives of cancer patients. We were founded in March 2010 by former executives of MGI PHARMA, Inc., or MGI PHARMA, an oncology and acute-care focused biopharmaceutical company. We have in-licensed and are currently developing two product candidates, rolapitant and TSR-011. We intend to continue to leverage the experience and competencies of our senior management team to identify, acquire, develop and commercialize cancer therapeutics and oncology supportive care products that are safer and more effective than existing treatments.

        Our product portfolio currently consists of two oncology-related product candidates:

    Rolapitant, a potent and long-acting neurokinin-1, or NK-1, receptor antagonist currently in Phase 3 clinical trials for the prevention of chemotherapy induced nausea and vomiting, or CINV; and

    TSR-011, an orally available anaplastic lymphoma kinase, or ALK, inhibitor (targeted anti-cancer agent) currently in preclinical development. We plan to test TSR-011 in clinical trials as a treatment for non-small cell lung cancer, or NSCLC, and potentially other cancer indications.

        In December 2010, we in-licensed the exclusive worldwide rights to our first product candidate, rolapitant, a long-acting NK-1 receptor antagonist that is being developed for the prevention of CINV. CINV has the potential to afflict up to 90% or more of cancer patients undergoing chemotherapy, depending upon the type of chemotherapy administered, the dosing schedule of the chemotherapy and the patients' gender, among other predisposing factors. If not prevented, CINV may result in a delay or even discontinuation of chemotherapy treatment. Prolonged nausea and vomiting may lead to unwanted weight loss, dehydration and malnutrition as well as hospitalization and is one of the most debilitating symptoms of cancer treatment. We estimate that annually in the United States there are nearly 7 million treatments administered on the first day of chemotherapy consisting of the current standard of care for the prevention of CINV. Based on current treatment guidelines, we estimate that 70% to 80% of cancer patients being treated with the current standard of care for CINV should also receive treatment with an NK-1 receptor antagonist.

        The current standard of care for CINV consists of a 5-HT3 receptor antagonist (usually any one of ondansetron, granisetron, dolasetron or palonosetron) plus a corticosteroid (usually dexamethasone). 5-HT3, or serotonin sub-type 3, receptor antagonists block the binding of serotonin to the 5-HT3 receptor in specific nerve endings in the body and the brain, resulting in a reduction in nausea and vomiting in patients at risk for CINV. Optimal protection against CINV is provided to certain patients when a second class of drug, known as an NK-1 receptor antagonist, is administered together with a 5-HT3 receptor antagonist. NK-1 receptor antagonists block substance P from binding to NK-1 receptors. Neurokinin substance P is a natural substance in the brain that binds to the NK-1 receptor and represents a second mechanism that induces nausea and vomiting. Currently, aprepitant and its pro-drug fosaprepitant, which are both known by the brand name EMEND and marketed by Merck & Co., Inc., or Merck, are the only commercially available NK-1 receptor antagonists. In 2011, EMEND generated $419 million in global revenues. We believe there is a significant need for another NK-1 receptor antagonist with improved properties over EMEND.

        We believe that rolapitant has several important characteristics, including rapid onset and long duration of action, low potential for drug-drug interactions, and meaningful impact on reducing nausea. We are investigating whether a single dose of rolapitant will, when administered along with the current standard of care for CINV, significantly increase the control of both nausea and vomiting over the 5-day period of risk for cancer patients receiving emetogenic chemotherapy as compared to the current standard of care alone. We plan to present data from a 454-patient, randomized, placebo controlled

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Phase 2 clinical trial that evaluated rolapitant in patients at high risk for CINV at the American Society of Clinical Oncology, or ASCO, conference in June 2012. We expect to report top line results for our ongoing Phase 3 clinical program for rolapitant during the second half of 2013.

        We in-licensed the exclusive worldwide rights to rolapitant from OPKO Health, Inc., or OPKO. OPKO had acquired certain NK-1 receptor related assets, including rolapitant, in 2010 from Schering-Plough Corporation, or Schering-Plough, as part of a United States Federal Trade Commission, or FTC, requirement to divest certain assets in connection with Schering-Plough's combination with Merck. Prior to its divestiture of rolapitant, Schering Plough evaluated rolapitant in over 1,000 subjects, including studies for the prevention of post-operative nausea and vomiting, or PONV, and chronic cough, and completed a Phase 2 clinical trial in patients at high risk for CINV.

        In March 2011, we in-licensed the exclusive worldwide rights to our second product candidate, TSR-011, from Amgen, Inc., or Amgen. TSR-011 is a small molecule inhibitor of ALK, for the treatment of NSCLC and potentially other cancer indications. The ALK program represents a molecularly targeted approach to treating certain cancer sub-populations of NSCLC that express ALK gene fusions or mutations that result in pathological constitutive activation of ALK, thereby enabling tumor cells to grow. Abnormal ALK proteins, or ALK expression, is also associated with sub-populations of other cancers including lymphoma and neuroblastoma. TSR-011 was specifically designed to be selective for, bind tightly to and inhibit the activity of the ALK protein to result in the death of cancer cells and the shrinking of tumors. In August 2011, the United States Food and Drug Administration, or FDA, approved the first ALK inhibitor, developed by Pfizer Inc., or Pfizer, Xalkori (crizotinib), which was approved for the treatment of patients with locally advanced or metastatic NSCLC that are ALK positive.

        We plan to develop TSR-011 for oncology indications, including, but not limited to, the treatment of patients with NSCLC whose tumors express an altered ALK protein. TSR-011 is currently in preclinical development, and we plan to submit an Investigational New Drug application, or IND, during the second half of 2012. If the FDA does not object to that filing, we plan to initiate a Phase 1 clinical trial of TSR-011.

        Upon successful development and regulatory approval of any of our product candidates we intend to make them available to cancer patients in North America, Europe and China through our own commercialization efforts. At this time, we believe that if we commercialize our products directly in these geographic areas, we will receive a greater return on our investment than if we license these products to third parties for sale. We believe this because our management team has experience commercializing products in these geographic areas, including an understanding of the relevant sales, marketing and reimbursement frameworks unique to these areas. In addition to developing internal commercial capabilities within these three geographic areas, we intend to establish a network of licensees and distributors in other geographic areas.

        We were founded in March 2010 by former executives of MGI PHARMA, which was acquired by Eisai Co., Ltd. in 2008. While at MGI PHARMA, our senior management team collaborated in the clinical development and commercialization of several cancer therapeutics and oncology supportive care drugs, including Aloxi (palonosetron HCl). In marketing rolapitant, we believe we will be able to leverage our senior management team's long-standing experience with key opinion leaders, patient groups, payors, oncology networks, cancer centers, oncologists, oncology nurses, and pharmacists. Given this experience, we believe we can successfully develop and, if approved, commercialize rolapitant, and grow the market for NK-1 receptor antagonists. Through our senior management team's network of industry contacts, we continue to evaluate additional product candidate licensing and acquisition opportunities for the treatment and support of cancer patients.

        Our senior management team includes our Chief Executive Officer and co-founder, Leon (Lonnie) Moulder, Jr., our President and Chief Scientific Officer and co-founder, Mary Lynne Hedley, Ph.D.,

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and our Executive Vice President and Chief Financial Officer and co-founder, Richard Rodgers. Mr. Moulder has been involved in a number of biopharmaceutical companies, including as vice-chairman of the board of directors and president and chief executive officer of Abraxis BioScience, Inc., vice chairman and executive vice president of Eisai Corporation of North America and president and chief executive officer of MGI PHARMA. Dr. Hedley has served as the executive vice president and chief scientific officer of Abraxis BioScience, Inc., executive vice president of Eisai Corporation of North America and executive vice president and chief scientific officer of MGI PHARMA. Dr. Hedley also previously co-founded and served as chief executive officer and president of a biotechnology company, ZYCOS, Inc., which was acquired by MGI PHARMA. Mr. Rodgers has previously served as the senior vice president of finance and administration and chief financial officer for Abraxis BioScience, Inc. and senior vice president, controller and chief accounting officer of MGI PHARMA. For more information on our management, see "Management—Executive Officers and Directors."

Our Strategy

        Our strategy is to leverage the experience and competencies of our senior management team to identify, acquire and develop promising drug candidates and to commercialize cancer therapeutics and oncology supportive care products that are safer and more effective than existing treatments. This strategy is based upon our belief that it is efficient and effective to focus our efforts on both cancer therapeutics and oncology supportive care because the same treatment centers and healthcare professionals can be covered by a single sales and marketing organization.

        The key components of our strategy are:

    Rapidly Develop and Successfully Commercialize Rolapitant for the Prevention of CINV.  We recently initiated our global Phase 3 clinical program for rolapitant, approximately one year after in-licensing this product candidate. We expect to report top line Phase 3 clinical trial data for rolapitant in the second half of 2013. We believe that our senior management team's experience in the development of oncology products will allow us to rapidly identify and accrue patients in our Phase 3 clinical program for rolapitant, which will include investigative sites in over 25 countries. We believe that we are well positioned to maximize the commercial potential of rolapitant. At MGI PHARMA, in 2003 our senior management team successfully launched and commercialized Aloxi, a 5-HT3 receptor antagonist for the prevention of CINV, in the United States. Aloxi, based on revenues, became the largest product in its class in 2006. This success was despite the fact that Aloxi was the fourth 5-HT3 receptor antagonist to market in the United States and competed with products sold by GlaxoSmithKline plc, Roche Holding Ltd. and Sanofi S.A. We intend to leverage the experience that our senior management team gained at MGI PHARMA to establish rolapitant as part of the standard of care for prevention of CINV in patients who, per established treatment guidelines, could benefit, in addition to the current treatment with a 5-HT3 receptor antagonist.

    Advance TSR-011 Through Clinical Trials for the Treatment of NSCLC and Other Tumor Types Associated with ALK Mutations.  We intend to pursue an accelerated development pathway for TSR-011 that, if successful, will enable us to reduce the time to receive regulatory approval for this product candidate. We plan to file an IND for TSR-011 during the second half of 2012. If our IND is not objected to by the FDA, we plan to conduct a Phase 1 dose escalation clinical trial of TSR-011 in healthy volunteers. Doing so may enable us to quickly identify an optimal dosing schedule and initiate a clinical study in cancer patients at higher, and possibly active, dosing levels. We will seek to identify the maximum tolerated dose of TSR-011 in cancer patients and subsequently evaluate TSR-011 in select NSCLC patient populations with ALK mutations, including those who have not been previously treated with ALK inhibitors, those who have progressed during treatment with other ALK inhibitors and those with other tumor types driven

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      by ALK. ALK is a key driver of multiple types of cancers, including subsets of NSCLC, neuroblastoma and lymphoma, and in order to maximize the commercial potential of TSR-011, we plan to study TSR-011 in multiple tumor types and treatment settings. We believe that TSR-011 is differentiated from crizotinib, the only marketed ALK inhibitor, as well as other ALK inhibitors in development due to its potency, specificity and activity on specific mutant ALK proteins and by its pharmacological properties, which could attract clinical investigators and patients to our clinical trials.

    In-license or Acquire Additional Product Candidates to Create a Balanced Product Portfolio.  We intend to in-license or acquire additional product candidates across various stages of development. We do not have, nor do we intend to build, drug discovery capabilities. We intend to focus on product candidates that we believe are differentiated from existing cancer therapeutics and oncology supportive care products and that have well defined, and potentially expeditious, clinical and regulatory pathways. We believe that our two current product candidates have these characteristics. We believe that our ability to execute on this strategy is due to our senior management team's previous experience with in-licensing and acquiring cancer therapeutics and oncology supportive care products on mutually advantageous terms while at MGI PHARMA, developing and obtaining regulatory approval for these compounds and their prior success in developing markets for and commercializing these products. Our objective is to build a portfolio of cancer therapeutics and oncology supportive care products that is balanced by stage of development, resource requirements and development risk. We categorize acquisition or in-licensing targets as follows:

    Lower risk, later-stage assets that serve as a foundation for building a commercial business.    We will continue to seek to in-license or acquire late-stage product candidates such as rolapitant, with well-defined regulatory and clinical development paths. By doing so, we believe that we can minimize to some degree the risks of development and regulatory approval. Having multiple products at, or near, a commercial stage will allow us to utilize the sales and marketing and medical affairs organizations we intend to build in a cost-effective manner.

    Mid-stage assets supported by early clinical study results indicating activity and adequate safety.    We seek to acquire mid-stage product candidates and advance these to final clinical testing, regulatory approval and commercialization. In identifying mid-stage assets, we will focus on assets that we believe demonstrate activity and adequate safety based on early clinical testing (i.e., Phase 1 or 2 clinical trials). Assets at this mid-stage generally will have more risk of eventual success than later-stage assets we acquire.

    Early-stage, potentially transformational assets associated with signals of effectiveness or patient selection approaches, by use of tools such as biomarkers.    We seek to acquire early-stage assets that we can develop from preclinical status to commercialized products. For this category of assets, we intend to focus on those compounds for which signals of effectiveness are demonstrated during in vitro or in vivo preclinical testing. Ideally, the early-stage assets we in-license or acquire will exhibit signals of effectiveness for identifiable subpopulations of cancer patients, thereby allowing for the selection of cancer patients during clinical testing who are most likely to respond to treatment. We believe this will lead to more efficient and effective clinical trials and, if approved, better prescription patterns, providing for the best potential patient outcomes. We believe that this more personalized medicine approach to cancer therapy will allow for a more rapid and efficient path to product candidate development, registration and commercialization. We believe that TSR-011 is representative of this type of asset.

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      Currently marketed products and soon to be marketed products around which we could develop a commercial operation.    We seek to acquire attractive assets that have received regulatory approval and are, or are about to be, marketed to the same treatment centers and healthcare professionals as those to whom we would market our product candidates. Having multiple marketed products can lead to efficiencies of scale in sales and marketing and medical affairs, as well as driving faster market penetration for future products.

    Build Global Capabilities to Maximize the Value of Our Product Candidates.  We currently retain the exclusive worldwide rights to both of our product candidates, rolapitant and TSR-011, and we intend to utilize this to develop and commercialize our product candidates globally. We intend to seek to acquire global rights for product candidates we may acquire or in-license in the future.

    Develop Our Products Globally.    We are developing rolapitant, and intend to develop TSR-011 and any future product candidates, on a global basis in order to more rapidly accrue patients and support regulatory submission to health authorities outside of the United States. We believe that this will result in shortened development timelines, earlier submission of marketing authorization and, if the clinical results warrant, regulatory approval earlier than would be expected if we were to run clinical development programs entirely within the United States.

    Commercial Operations in Key Markets.    We currently plan to commercialize our portfolio of cancer therapeutics and oncology supportive care products by deploying fully integrated sales and marketing organizations in core strategic markets—specifically North America, key European markets and China—and establishing distributor networks or licensee arrangements in non-core markets around the world. We believe that building our own commercial operations function in our core strategic markets is an important component of our strategy because by doing so we expect to receive a greater return on our product investment than if we license these products to third parties for sale. We believe this because our management team has experience commercializing products in these core strategic markets, and understands the relevant sales, marketing and reimbursement frameworks. We, therefore, expect that we will be able to generate higher revenue than if we sell exclusively through licensees or distributors.

Overview of the Market for Cancer Therapeutics and Oncology Supportive Care Products

        Cancer is a group of diseases characterized by uncontrolled growth and spread of abnormal cells. The American Cancer Society estimated that in the United States in 2011, approximately 1.6 million new cases of cancer would be diagnosed and nearly 600,000 people would die from the disease. Current treatments for cancer include surgery, radiation therapy, chemotherapy, hormone therapy and targeted therapy. The National Institutes of Health estimates overall costs of cancer in 2010 at $263.8 billion, of which $102.8 billion was related to direct medical costs (i.e., a total of all health expenditures), $20.9 billion was related to indirect morbidity costs (i.e., the cost of lost productivity due to illness) and $140.1 billion was related to indirect morbidity costs (i.e., the cost of lost productivity due to premature death). The IMS Institute for Healthcare Informatics estimates in a 2011 report that global oncology spending will reach $75 billion to $80 billion by 2015, representing the largest class of drug spending globally.

        Many marketed products and product candidates for treating cancer patients that are currently being developed by biopharmaceutical companies are cytotoxic chemotherapies that exert their toxic effect on cancer generally through nonspecific damage to cellular components with the goal of causing cancer cell malfunction and cell death. Other products and product candidates alter cell metabolism or internal repair mechanisms leading to the demise of the cancer cell. More recently, targeted anti-cancer agents have been designed by scientists to inhibit the action of specific molecules within cancer cells

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that are driving the aberrant growth responsible for tumor development. Certain of these targeted agents are developed in conjunction with companion diagnostic tests that are used by clinicians to determine if a patient's cancerous tumor contains these specific molecules and is, therefore, more likely to respond to a particular targeted therapy.

        All of these approaches may be associated with various side effects experienced by cancer patients that result from the treatments having an adverse impact on normal functioning cells and organ systems. Some of the more common side effects of cancer therapy include nausea, vomiting or emesis, infections, fatigue and diarrhea. Supportive care products are frequently prescribed or administered to cancer patients to prevent or treat these side effects thereby allowing the patients to continue to receive potentially life prolonging cancer therapies.

        Treatment centers (such as hospitals and community cancer centers) and the healthcare professionals who treat cancer patients (physicians, nurses, physician assistants and pharmacists) utilize various combinations of cancer therapeutics and oncology supportive care products to extend and improve the quality of life of these patients. Aligned with this is our strategy to acquire, develop and directly commercialize product candidates that address the needs of cancer patients, that is, both product candidates that treat cancer diseases and those that address the side-effects from such treatments.

Our Product Candidates

        Our first two in-licensed product candidates are consistent with our strategy to develop and commercialize cancer therapeutics and oncology supportive care products. The following table summarizes the status of these product candidates.

GRAPHIC

Rolapitant—Neurokinin-1 (NK-1) Receptor Antagonist

    Overview

        Rolapitant, is a potent and long-acting NK-1 receptor antagonist that is being developed as a supportive care product for the prevention of CINV. We are investigating whether a single dose of rolapitant will, when administered along with the current standard of care for CINV (a 5-HT3 receptor antagonist plus a corticosteroid), significantly increase the control of both nausea and vomiting over the 5-day period of risk for cancer patients receiving emetogenic chemotherapy as compared to the current standard of care alone. We obtained the exclusive worldwide rights to research, develop, manufacture, market and sell rolapitant from OPKO in December 2010. OPKO had acquired certain NK-1 assets, including rolapitant, in 2010 from Schering-Plough as part of an FTC requirement to divest certain assets in connection with Schering-Plough's combination with Merck.

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    Chemotherapy Induced Nausea and Vomiting

        Chemotherapy induced nausea and vomiting, if not prevented by prophylaxis, has the potential to afflict up to 90% or more of cancer patients undergoing chemotherapy, depending upon the type of chemotherapy administered, the dosing schedule of the chemotherapy and the patients' age and gender, among other predisposing factors. Prolonged nausea and vomiting may result in unwanted weight loss, dehydration and malnutrition as well as hospitalization. If not prevented, CINV may result in a delay or even discontinuation of chemotherapy treatment. We estimate that annually in the United States there are nearly 7 million treatments administered on the first day of chemotherapy consisting of the current standard of care for the prevention of CINV. Based on current treatment guidelines, we estimate that 70% to 80% of cancer patients being treated with the current standard of care for CINV should also receive treatment with an NK-1 receptor antagonist.

        The following figure summarizes rankings of chemotherapy treatment side effects from a study of patients diagnosed with ovarian, primary peritoneal or fallopian tube cancer who received at least three cycles of platinum-based chemotherapy. Using a visual analog score, where patients rank different side effects on a scale from zero to 100, with zero being the least favorable and 100 being the most favorable, patients evaluated different side effects related to cancer and chemotherapy treatment, including CINV 1-6, representing different scenarios of CINV. For all subjects in this study, the most favorable side effects included perfect health and clinical remission. CINV 1 or complete-to-almost complete control of CINV followed, while almost all of the least favorable side effects included nausea and vomiting. This figure shows that patients view CINV as one of the least favorable side effects of chemotherapy treatment.


Patient Rankings of Chemotherapy Treatment Side Effects

GRAPHIC


Source:    Adapted from Charlotte C. Sun et al., Rankings and symptom assessments of side effects from chemotherapy: insights from experienced patients with ovarian cancer, Support Care Cancer (2005).

        There are two phases associated with CINV: acute and delayed. The acute phase occurs within the first 24 hours following chemotherapy treatment. It is believed that this phase is caused largely by chemotherapy-induced increases in serotonin release and activation of 5-HT3 receptors on vagal afferent neurons in the gut. There are currently four 5-HT3 receptor antagonists on the market in the

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US (ondansetron, palonosetron, granisetron and dolasetron) and one additional agent that is available in several international markets (tropisetron), all of which are clinically effective in preventing acute CINV, particularly when given in combination with a corticosteroid, such as dexamethasone. Despite the success of the 5-HT3 receptor antagonists, protection of patients from acute CINV is not complete because other neurotransmitters are also involved in the onset of CINV. Furthermore, there remains a strong need to develop potent therapies effective to prevent or treat delayed CINV.

        Delayed CINV is described as occurring after 24 hours and up to five days following emetogenic chemotherapy and is believed to be primarily driven by a different etiology than acute CINV. Combination therapy with a corticosteroid and 5-HT3 receptor antagonist, particularly with the first generation 5-HT3 receptor antagonists, is less effective during the delayed phase than it is in the acute phase of CINV. This is because the primary etiology of delayed CINV appears to involve the neurokinin substance P. Substance P binds to NK-1 receptors, which are highly concentrated in the brain. Activation of NK-1 receptors plays a central role in nausea and vomiting induced by emetogenic stimuli, including certain cancer chemotherapies. An NK-1 receptor antagonist works by blocking the binding of substance P with NK-1 receptors. The addition of an NK-1 receptor antagonist to the standard of care (a 5-HT3 receptor antagonist plus a corticosteroid) has been demonstrated to improve the management of both acute and delayed CINV that is experienced by cancer patients undergoing chemotherapy.

        Despite the importance of the NK-1 receptor in the etiology of both acute and delayed emesis, there are only two approved products that target this receptor, aprepitant and its pro-drug fosaprepitant, which are both known by the brand name EMEND and marketed by Merck. In multiple clinical trials, EMEND provided significantly better protection against both acute and delayed emesis when it was added to a 5-HT3 receptor antagonist and corticosteroid as compared to the 5-HT3 receptor antagonist and corticosteroid alone. EMEND was initially introduced as an oral formulation in 2003. In 2010, Merck introduced a single-dose intravenous, or IV, formulation of EMEND, which we believe currently accounts for over 50% of all EMEND usage.

    Clinical Guidelines for the Usage of 5-HT3 and NK-1 Receptor Antagonists

        Most patients who receive preventative therapy for CINV receive chemotherapy regimens that are defined as having either high or moderate risk. According to the FDA, highly emetogenic chemotherapy, or HEC, regimens typically consist of those containing cisplatin, a chemotherapy drug. However, CINV prevention and treatment guidelines developed and published by respected oncology organizations such as the National Cancer Care Network, or NCCN, Multinational Association for Supportive Care in Cancer, or MASCC, and ASCO also define anthracycline-cyclophosphamide containing treatment regimens as HEC. Such regimes are frequently utilized to treat certain types of breast cancer. Moderately emetogenic chemotherapy, or MEC, is categorized by ASCO, NCCN and other treatment guidelines, and includes chemotherapy agents such as carboplatin, irinotecan, ifosfamide and cisplatin when administered in doses of less than 50mg/m2.

Emetogenic Potential (ASCO,
MASCC, NCCN Guidelines)
  Proportion of Patients Who Will Experience
Emesis in the Absence of
Effective Antiemetic Prophylaxis
High   ³90% of patients
Moderate   30 - 90% of patients
Low   10 - 30% of patients
Minimal   <10% of patients

        According to current treatment guidelines, the risk of vomiting for patients receiving HEC regimens, including anthracycline-cyclophosphamide, is equal to or greater than 90%. We estimate that patients receiving HEC regimens make up approximately 70% of the potential NK-1 receptor

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antagonist treatment market. The current treatment guidelines also suggest that MEC regimens are associated with a risk of vomiting in the range of 30% to 90%. We estimate that approximately 30% of the NK-1 receptor antagonist treatment market consists of patients receiving MEC regimens.

        While the current United States NK-1 market is approximately $270 million (represented by oral and IV formulations of EMEND), we believe there is a larger market opportunity for the class. Following the 2011 launch of a single dose, IV-only regimen (versus the pre-existing three day oral regimen), for the aprepitant pro-drug, fosaprepitant, the patient treatment market grew over 25% compared to the prior year. We believe the market will expand further based upon the combined sales and marketing activities and enhanced educational initiatives associated with three companies competing within the NK-1 receptor antagonist market. In addition to our activities and initiatives and those of Merck, we expect that Helsinn Healthcare and Eisai Inc. will be introducing a combination NK-1 receptor antagonist and 5-HT3 receptor antagonist product, netupitant plus Aloxi (palonosetron HCl). Overall trends in the market, growing awareness of supportive care issues and the implementation of guidelines for patient care, including the prevention of CINV, that are developed and published by oncology organizations, may also lead to greater use of NK-1 receptor antagonists.

    The Need for a Second Generation NK-1 Receptor Antagonist

        Rolapitant is a highly potent, long acting NK-1 receptor antagonist that may provide control of both nausea and vomiting over the 5-day period of risk for cancer patients receiving emetogenic chemotherapy, including HEC and MEC. The safety and pharmacokinetic profile observed in Phase 1 clinical trials, combined with clinical activity and safety profile observed in a randomized Phase 2 clinical trial described below, indicate that rolapitant represents a potential advance in the prevention of CINV. Among its advantages are:

    Long Half Life.  Data from a Phase 1 clinical trial showed that, after oral administration, rolapitant is rapidly absorbed and slowly cleared. The half-life is greater than 120 hours, a finding that suggests that a single dose may be sufficient to block CINV during both the acute (zero to 24 hour) and delayed (from 24 to 120 hours) phases. In comparison, the currently marketed oral NK-1 receptor antagonist therapy requires three doses per chemotherapy cycle.

    Reduced Risk of Drug Interactions.  Data from clinical studies conducted to date demonstrate that rolapitant is not an inhibitor or inducer of cytochrome P450 3A4 isoenzyme, or CYP3A4. CYP3A4 is a liver enzyme that is responsible for the metabolism of a number of drugs. When a drug inhibits or induces CYP3A4, it can lead to an adverse effect on the ability to metabolize other drugs. The data indicates that rolapitant does not alter the pharmacokinetics of midazolam or other tested CYP3A4 substrates, and consequently is unlikely to have an effect on the pharmacokinetics of drugs metabolized by CYP3A4. Based upon this data, and in contrast with the current oral and IV NK-1 receptor antagonist on the market, we believe that administration of rolapitant is unlikely to cause a clinically significant pharmacokinetic interaction with many commonly used drugs metabolized by CYP3A4 and intended for cancer patients undergoing chemotherapy.

    Rapid Onset of Activity.  In a Phase 2 clinical trial, time to first emesis or use of rescue medication for rolapitant versus the control group showed protection from CINV starting before six hours, which represents a quicker onset of action than has been observed in other agents in its class.

    Potential for Reduction in Significant Nausea.  In a Phase 2 clinical trial, the rolapitant 200mg dose group had significantly greater rates of no significant nausea in the overall, acute, and delayed phases than the control group, potentially representing an improvement over current anti-emetic therapies.

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    Rolapitant Clinical Development

        In 2008, Schering-Plough completed three Phase 2 clinical trials in which rolapitant was evaluated for the prevention of CINV, PONV and the treatment of chronic cough. One of these trials was designed to assess the efficacy and safety of rolapitant for the prevention of CINV for up to six cycles of chemotherapy, and to determine a Phase 3 dose. This was a multicenter, randomized, double blind clinical trial in which 454 cancer patients receiving HEC were administered a 5-HT3 receptor antagonist and a corticosteroid (ondansetron and dexamethasone), and randomized in equal fashion to groups receiving either placebo or 10mg, 25mg, 100mg or 200mg of a single dose oral formulation of rolapitant. Subjects recorded episodes of emesis, severity of nausea, and use of rescue medications daily in a subject diary from days one through six of cycle 1. The rolapitant 200 mg group, compared to the placebo group, had significantly greater complete response rates, meaning no emesis and no use of rescue medication, in the "overall" phase, meaning zero to 120 hours after receipt of HEC, the "acute" phase, meaning zero to 24 hours after receipt of HEC, and the "delayed" phase, meaning greater than 24 hours to 120 hours after receipt of HEC. Rates for no significant nausea for the 200mg rolapitant dose group demonstrated a superior treatment effect versus the placebo group.

        Treatment-related adverse events were mild and included constipation, headache, fatigue and dizziness. Overall, serious adverse events occurred with similar incidences across all treatment groups (9% to 14%). The most common serious adverse events were neutropenia (a disorder characterized by an abnormally low number of certain types of white blood cells), febrile neutropenia (the development of fever, often with signs of infection, in a patient with neutropenia), vomiting, dehydration, nausea and pneumonia. However, these events were considered related to chemotherapy or the underlying cancer and not to rolapitant. Data from this clinical study demonstrated that a dose of 200mg rolapitant administered with a 5-HT3 receptor antagonist and dexamethasone achieved statistically significant improvement in preventing CINV than did 5-HT3 receptor antagonist and dexamethasone alone, and this dose was selected for advancement into Phase 3 clinical trials.

        Results from the Phase 2 clinical trial discussed above demonstrated a promising level of activity for CINV prevention for the five-day period following administration of chemotherapy, the period during which patients are at highest risk for CINV. The safety and tolerability of single and repeat doses of rolapitant has been assessed in over 1,000 subjects, including each of the Phase 2 clinical trials completed by Shering-Plough. We expect to present data from the Phase 2 clinical trial of rolapitant for the prevention of CINV at the ASCO annual meeting in June 2012.

    Rolapitant Phase 3 Clinical Program

        Based on the results of the Phase 2 CINV trial, in February 2012, we initiated our Phase 3 clinical program for rolapitant and enrolled our first patient. The Phase 3 clinical program consists of approximately 2,400 patients participating in one of three Phase 3 clinical trials. This global program consists of two randomized, double-blind and placebo controlled clinical trials evaluating the efficacy of a single 200mg oral dose of rolapitant in patients receiving HEC, and one clinical trial evaluating the efficacy of a single 200mg oral dose of rolapitant in patients receiving MEC. Each of the HEC clinical trials consist of approximately 530 patients and are focused on evaluating rolapitant plus the standard of care compared with placebo plus the standard of care. The MEC clinical trial consists of approximately 1,350 patients and is focused on evaluating rolapitant plus the standard of care compared with placebo plus the standard of care. In each of the Phase 3 clinical trials the standard of care consists of the 5-HT3 receptor antagonist granisetron in combination with the corticosteroid dexamethasone. Results from each of these clinical trials are anticipated in the second half of 2013. The patients in these clinical trials are being evaluated for evidence of an improvement in control of nausea and vomiting during the acute, delayed and overall periods between zero and 120 hours post administration of chemotherapy. The primary outcome of each trial will be based on complete response (defined as no emetic episodes and no rescue medication) in the delayed phase (24 hours to

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120 hours). Additional outcome measures include complete response for other time points, the incidence and intensity of nausea, and safety and tolerability.

    Intravenous Formulation of Rolapitant

        We are developing a single dose rolapitant IV formulation to address what we believe is the market need for this dosage form. We believe this formulation will provide physicians with an additional route of administering rolapitant, while also alleviating certain concerns associated with payer pre-approval, logistics and pharmacy availability that are sometimes associated with oral formulations of drugs utilized by cancer patients. We expect to identify a single dose of the IV formulation that is bioequivalent to the single dose of the oral formulation through a standard bioequivalence clinical study we plan to initiate in the fourth quarter of 2012. Following identification of a single dose of the IV formulation that is bioequivalent to the oral formulation, we anticipate conducting a bridging safety study to support regulatory approval. Current plans for the development of the IV formulation are dependent on the success of the oral formulation. We expect that the new drug application, or NDA, that we submit to the FDA for the IV formulation of rolapitant will rely heavily on, and reference data in, the NDA submission for oral rolapitant. We plan to discuss this approach with the FDA prior to conducting a bridging safety study. We expect to launch an IV formulation of rolapitant approximately one year following the launch of the oral formulation.

TSR-011—Anaplastic Lymphoma Kinase (ALK) Inhibitor

    Overview

        TSR-011 is an orally available ALK inhibitor currently in preclinical development. We plan to test TSR-011 in clinical trials as a treatment for NSCLC and potentially other cancer indications. Although the ALK gene is not widely expressed in adults, ALK is known to be involved in certain types of cancers, including subsets of NSCLC, neuroblastoma and lymphoma. For patients in these subsets, the ALK gene is fused to an activating partner or contains point mutations, which results in constitutive activation of ALK and the growth of cancer cells and tumor development. Inhibition of ALK in these cancer cells results in cell death and tumor growth inhibition or regression. The limited tissue distribution and expression of ALK in adult subjects means that ALK may be a good molecular target for a cancer therapeutic because an ALK inhibitor would primarily affect cancer cells and tumors. In August 2011, the first ALK inhibitor was approved for the treatment of NSCLC.

        We believe that existing commercially available diagnostic tests for the identification of ALK gene fusions will facilitate rapid and efficient development of our lead ALK inhibitor product candidate, TSR-011. Data from a Phase 1 clinical program that we intend to initiate in the second half of 2012 will be used to select a dose and schedule of TSR-011. An expansion stage of the Phase 1 clinical trial will evaluate the activity of TSR-011 in cancer patients with ALK mutations or gene fusions. Data from this study will inform us of the activity of TSR-011 in a relevant patient population and will be used to design optimal Phase 2 clinical trials or Phase 2/3 clinical trials that will be used to support future regulatory submissions.

        In March 2011, we entered into a license agreement with Amgen to obtain exclusive worldwide rights to research, develop, manufacture, market and sell licensed ALK inhibitor compounds.

    Non-Small Cell Lung Cancer (NSCLC)

        Worldwide, over 1.6 million new lung cancer cases are identified annually, of which over 200,000 of these new lung cancer cases are in the United States. Lung cancer is the leading cause of cancer death in men and the second leading cause of cancer death in women. Lung cancer is typically divided into two groups based upon the histologic appearance of the tumor cells—small cell and non-small cell lung cancer, each of which is treated with distinct chemotherapeutic approaches. According to the American

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Cancer Society, NSCLC accounts for approximately 85% of lung cancer cases, with approximately 75% of these patients being diagnosed with metastatic or advanced disease. Despite the introduction of new therapies, such as Avastin (bevacizumab) and Alimta (pemetrexed), patients with locally advanced or metastatic NSCLC have five-year survival rates of just 24% and 4%, respectively, according to the Survival Epidemiology and End Results program of the National Cancer Institute. ALK is believed to be a key driver of tumor development in approximately 5% of all NSCLC patients.

    Background on ALK Inhibitors

        There is currently one ALK inhibitor that is marketed. In 2011, Pfizer launched Xalkori (crizotinib), a dual MET/ALK inhibitor that acts as an inhibitor for mesenchymal epithelial transition tyrosine kinase, or MET, a driver of certain types of cancers, and ALK. Clinical studies demonstrated impressive efficacy in a NSCLC sub-population expressing an ALK fusion protein. Treatment with crizotinib results in rapid tumor shrinkage in the majority of ALK patients. However, resistance mechanisms to crizotinib treatment occur within a median time frame of 10 months. In addition, there was a "Dear Doctor" letter issued by the FDA in December 2011 related to drug induced hepatotoxicity, which now requires monitoring of elevated liver enzymes. Currently, crizotinib is dosed near its maximum tolerated dose as side effects include severe or fatal pneumonitis, QTc prolongation (a type of heart rhythm abnormality) and visual effects.

        While crizotinib is a dual MET/ALK inhibitor, the compounds we in-licensed from Amgen, including TSR-011, were specifically designed based on the crystal structure of ALK to be selective for, and to bind to, ALK (as opposed to dual MET/ALK). Research experiments have demonstrated that TSR-011 is approximately 10 to 25 times more potent (based on in vitro and in vivo experiments) than crizotinib. TSR-011 has demonstrated promising results in preclinical studies, and was found to be more active than crizotinib in tested animal models. In addition to a high degree of selectivity, TSR-011 may have the potential for an improved safety profile and it exhibits pharmaceutical properties that are preferred when selecting a product candidate for advancement. We believe there is a well-defined development and regulatory approval path for an ALK inhibitor, and that TSR-011 can be developed in a rapid and efficient manner because appropriate patients for study can be identified with commercially available and other diagnostic tests. We also believe TSR-011 has the potential to be effective in crizotinib-resistant cancers, potentially permitting us to pursue a rapid path to commercialization.

    TSR-011 Preclinical and Clinical Development

        We plan to develop TSR-011 for oncology indications, including the treatment of patients with NSCLC whose tumors have altered ALK proteins and expression patterns. TSR-011 is currently in preclinical development, and we intend to submit an IND during the second half of 2012. If the FDA does not object to, we may then initiate a Phase 1 clinical trial of TSR-011 in the second half of 2012. One goal of the Phase 1 clinical trials will be to determine the maximum tolerated dose of TSR-011 and to define an optimal dosing schedule. Data from these trials will provide an early assessment of the activity of TSR-011 in the following populations: patients with NSCLC who have not been previously treated with ALK inhibitors; patients with NSCLC who have progressed while being treated with ALK inhibitors; and patients with a cancer other than NSCLC who have ALK amplification, ALK activating mutations or other ALK-fusions. Information from these studies will be used to design optimal Phase 2 clinical trials or Phase 2/3 clinical trials that will be used to support future regulatory submissions.

Licensing Agreements

License with OPKO

        In December 2010, we entered into a license agreement with OPKO to obtain an exclusive, royalty-bearing, sublicensable worldwide license, to research, develop, manufacture, market and sell rolapitant. Under the OPKO license we are obligated to use commercially reasonable efforts to conduct all preclinical, clinical, regulatory and other activities necessary to develop and commercialize rolapitant.

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        Under the terms of the OPKO license, we paid OPKO $6.0 million upon signing the agreement and issued 1,500,000 shares of our Series O preferred stock. We are also required to make development milestone payments to OPKO of up to an aggregate of $30.0 million if specified regulatory and initial commercial sales are achieved. In addition, we are required to make additional milestone payments to OPKO of up to an aggregate of $85.0 million if specified levels of annual net sales of rolapitant are achieved. If commercial sales of rolapitant commence, we will pay OPKO tiered royalties based on the amount of annual net sales achieved. We will share future profits from the commercialization, if any, by OPKO of licensed products in Japan, and OPKO retains an option to market the products in Latin America.

        The license with OPKO will remain in force until the expiration of the royalty term in each country, unless OPKO has cause to terminate the license earlier for our material breach of the license or bankruptcy. We have a right to terminate the license at any time during the term for any reason on three months' written notice to OPKO.

License with Amgen

        In March 2011, we entered into a license agreement with Amgen, under which we received an exclusive, royalty bearing, sublicensable worldwide license under certain of Amgen's patent rights to research, develop, manufacture, market and sell licensed ALK inhibitor compounds, including TSR-011. We are also responsible for using commercially reasonable efforts to conduct all preclinical, clinical, regulatory and other activities necessary to develop and commercialize an ALK product. In the event that we wish to sublicense any of the development and commercialization rights to any third party, we are required to grant to Amgen a right of first negotiation with respect to the rights we propose to sublicense.

        Under the terms of the license agreement, we made an up-front payment to Amgen of $0.5 million. We are required to make milestone payments to Amgen of up to an aggregate of $138 million if specified clinical, regulatory approvals, initial commercialization and annual net product sales milestones are achieved. If commercial sales of a product commence, we will pay Amgen royalties based on cumulative net sales.

        The license with Amgen will remain in force until the expiration of the royalty term in each country, unless Amgen has cause to terminate the license earlier for our material breach of the license or bankruptcy, or in the event that we or any sublicensee bring a challenge against Amgen in relation to the licensed patents. We have the right to terminate the license with Amgen on Amgen's bankruptcy, or at any time during the term on ninety days' written notice if our board of directors concludes that due to scientific, technical, regulatory or commercial reasons, the further commercialization of licensed products is no longer feasible.

Competition

        Our industry is highly competitive and subject to rapid and significant technological change. While we believe that our development experience and scientific knowledge provide us with competitive advantages, we may face competition from large pharmaceutical and biotechnology companies, smaller pharmaceutical and biotechnology companies, including specialty pharmaceutical companies and generic drug companies, academic institutions, government agencies and research institutions, and others.

        The acquisition or licensing of pharmaceutical products is also very competitive, and a number of more established companies, which have acknowledged strategies to in-license or acquire products, may have competitive advantages as may other emerging companies taking similar or different approaches to product acquisitions. The more established companies may have a competitive advantage over us due to their size, cash flows and institutional experience.

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        Many of our competitors may have significantly greater financial, technical and human resources than we have. Mergers and acquisitions in the pharmaceutical and biotechnology industries may result in even more resources being concentrated among a smaller number of our competitors. Our commercial opportunity could be reduced or eliminated if our competitors develop or market products or other novel technologies that are more effective, safer or less costly than any that will be commercialized by us, or obtain regulatory approval for their products more rapidly than we may obtain approval for ours. Our success will be based in part on our ability to identify, develop, and manage a portfolio of drugs that are safer and more effective in the treatment and support of cancer patients.

Rolapitant Competition

        Aprepitant and its pro-drug fosaprepitant, which are both known by the brand name EMEND and marketed by Merck, are currently the only commercially available NK-1 receptor antagonists. Helsinn Healthcare and Eisai Inc., have an active clinical program for an oral combination NK-1 receptor antagonist and 5-HT3 receptor antagonist product (netupitant plus Aloxi (palonosetron HCl)).

TSR-011 Competition

        There is currently one ALK inhibitor that is marketed, Xalkori (crizotinib), a dual MET/ALK inhibitor marketed by Pfizer. In addition, we are aware of four oral ALK inhibitors in development. These products are Chugai Pharmaceutical Co., Ltd.'s AF802, currently in Phase 1/2 clinical trials, and ARIAD Pharmaceuticals, Inc.'s AP26113, Astellas Pharma US, Inc.'s ASP-3026 and Novartis AG's LDK378, each currently in Phase 1 clinical trials.

        For more information on the market for cancer therapeutics and oncology supportive care products, our competitors and the products that may compete with our product candidates, see "—Overview of Market for Cancer Therapeutics and Oncology Supportive Care Products," "—Our Product Candidates—Rolapitant—Neurokinin-1 (NK-1) Receptor Antagonist—Chemotherapy Induced Nausea and Vomiting (CINV)" and "—Our Product Candidates—TSR-011—Anaplastic Lymphoma Kinase (ALK) Inhibitor—Background of ALK Inhibitors."

Commercial Operations

        We intend to build the commercial infrastructure in North America, Europe and China necessary to effectively support the commercialization of rolapitant and TSR-011, together with future product candidates, if and when we believe a regulatory approval of the first of such product candidates in a particular geographic market appears likely in the near term. The commercial infrastructure is expected to include a targeted, oncology sales force to establish relationships with a focused group of oncologists, oncology nurses and pharmacists. The sales force will be supported by sales management, internal sales support, an internal marketing group and distribution support. Additionally, the sales and marketing teams will manage relationships with key accounts such as managed care organizations, group-purchasing organizations, hospital systems, oncology group networks, and government accounts. To develop the appropriate commercial infrastructure, we will have to invest significant amounts of financial and management resources, some of which will be committed prior to any confirmation that rolapitant or TSR-011 will be approved and we could invest resources and then later learn that a particular product candidate is not being approved.

Government Regulation

        As a pharmaceutical company that operates in the United States, we are subject to extensive regulation by the FDA and other federal, state, and local regulatory agencies. The Federal Food, Drug, and Cosmetic Act, or the FDC Act, and its implementing regulations set forth, among other things,

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requirements for the testing, development, manufacture, quality control, safety, effectiveness, approval, labeling, storage, record keeping, reporting, distribution, import, export, advertising and promotion of our products. Although the discussion below focuses on regulation in the United States, because that is currently our primary focus, we anticipate seeking approval for, and marketing, our products in other countries. Generally, our activities in other countries will be subject to regulation that is similar in nature and scope as that imposed in the United States, although there can be important differences. Additionally, some significant aspects of regulation in Europe are addressed in a centralized way through the European Medicines Agency, but country-specific regulation remains essential in many respects.

Development and Approval

        Under the FDC Act, FDA approval is required before any new drug, including a generic equivalent of a previously approved drug, can be marketed in the United States. As a general matter, the FDA must approve an NDA before a new drug product (other than a generic drug) may be marketed in the United States. NDAs require extensive studies and submission of a large amount of data by the applicant.

        Preclinical Testing.    Before testing any compound in human subjects in the United States, a company must generate extensive preclinical data. Preclinical testing generally includes laboratory evaluation of product chemistry and formulation, as well as toxicological and pharmacological studies in several animal species to assess the quality and safety of the product. Animal studies must be performed in compliance with the FDA's Good Laboratory Practice, or GLP, regulations and the United States Department of Agriculture's Animal Welfare Act.

        IND Application.    Human clinical trials in the United States cannot commence until an IND application is submitted and becomes effective. A company must submit preclinical testing results to the FDA as part of the IND, and the FDA must evaluate whether there is an adequate basis for testing the drug in initial clinical studies in human volunteers. Unless the FDA raises concerns, the IND becomes effective 30 days following its receipt by the FDA. Once human clinical trials have commenced, the FDA may stop the clinical trials by placing them on "clinical hold" because of concerns about the safety of the product being tested, or for other reasons.

        Clinical Trials.    Clinical trials involve the administration of the drug to healthy human volunteers or to patients, under the supervision of a qualified investigator. The conduct of clinical trials is subject to extensive regulation, including compliance with the FDA's bioresearch monitoring regulations and Good Clinical Practice, or GCP, requirements, which establish standards for conducting, recording data from, and reporting the results of, clinical trials, and are intended to assure that the data and reported results are credible and accurate, and that the rights, safety, and well-being of study participants are protected. Clinical trials must be conducted under protocols that detail the study objectives, parameters for monitoring safety, and the efficacy criteria, if any, to be evaluated. Each protocol is reviewed by the FDA as part of the IND. In addition, each clinical trial must be reviewed, approved, and conducted under the auspices of an Institutional Review Board, or IRB, at the institution conducting the clinical trial. Companies sponsoring the clinical trials, investigators, and IRBs also must comply with regulations and guidelines for obtaining informed consent from the study subjects, complying with the protocol and investigational plan, adequately monitoring the clinical trial, and timely reporting adverse events. Foreign studies conducted under an IND must meet the same requirements that apply to studies being conducted in the United States. Data from a foreign study not conducted under an IND may be submitted in support of an NDA if the study was conducted in accordance with GCP and the FDA is able to validate the data.

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        A study sponsor is required to publicly post certain details about active clinical trials and clinical trial results on government or independent websites (e.g., http://clinicaltrials.gov). Human clinical trials typically are conducted in three sequential phases, although the phases may overlap with one another:

    Phase 1 clinical trials represent the initial administration of the investigational drug to humans, typically to a small group of healthy human subjects, but occasionally to a group of patients with the targeted disease or disorder. Phase 1 clinical trials generally are intended to determine the metabolism and pharmacologic actions of the drug, the side effects associated with increasing doses, and, if possible, to gain early evidence of effectiveness.

    Phase 2 clinical trials generally are controlled studies that involve a relatively small sample of the intended patient population, and are designed to develop data regarding the product's effectiveness, to determine dose response and the optimal dose range, and to gather additional information relating to safety and potential adverse effects.

    Phase 3 clinical trials are conducted after preliminary evidence of effectiveness has been obtained, and are intended to gather the additional information about safety and effectiveness necessary to evaluate the drug's overall risk-benefit profile, and to provide a basis for physician labeling. Generally, Phase 3 clinical development programs consist of expanded, large-scale studies of patients with the target disease or disorder to obtain statistical evidence of the efficacy and safety of the drug at the proposed dosing regimen.

        The sponsoring company, the FDA, or the IRB may suspend or terminate a clinical trial at any time on various grounds, including a finding that the subjects are being exposed to an unacceptable health risk. Further, success in early-stage clinical trials does not assure success in later-stage clinical trials. Data obtained from clinical activities are not always conclusive and may be subject to alternative interpretations that could delay, limit or prevent regulatory approval.

        We have initiated a Phase 3 clinical program for rolapitant. With regard to our ALK program, we are conducting preclinical studies with compound TSR-011 in preparation for the submission of an IND, which we anticipate will occur in the second half of 2012.

        NDA Submission and Review.    After completing clinical testing of an investigational drug, a sponsor must prepare and submit an NDA for review and approval by the FDA. The NDA is a comprehensive, multi-volume application that includes, among other things, the results of preclinical and clinical studies, information about the drug's composition, and our plans for manufacturing, packaging, and labeling the drug. When an NDA is submitted, the FDA conducts a preliminary review to determine whether the application is sufficiently complete to be accepted for filing. If it is not, the FDA may refuse to file the application and request additional information, in which case the application must be resubmitted with the supplemental information, and review of the application is delayed.

        Although the FDC Act states that the FDA must review and act on an NDA within 180 days, in practice the process typically takes longer than that. In fact, FDA performance goals generally provide for action on an NDA within 10 months of submission, but even that deadline is extended in certain circumstances. Moreover, the review process is often significantly extended by FDA requests for additional information or clarification. The FDA can expedite the review of new drugs that are intended to treat serious or life threatening conditions and demonstrate the potential to address unmet medical needs, such that the targeted action date is 6 months from submission.

        As part of its review, the FDA may refer an NDA to an advisory committee for evaluation and a recommendation as to whether the application should be approved. Although the FDA is not bound by the recommendation of an advisory committee, the agency usually has followed such recommendations. The FDA may determine that a Risk Evaluation and Mitigation Strategy, or REMS, is necessary to ensure that the benefits of a new product outweigh its risks, and the product can therefore be

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approved. A REMS may include various elements, ranging from a medication guide or patient package insert to limitations on who may prescribe or dispense the drug, depending on what the FDA considers necessary for the safe use of the drug. Under the Pediatric Research Equity Act, certain applications for approval must include an assessment, generally based on clinical study data, of the safety and effectiveness of the subject drug in relevant pediatric populations. The FDA may waive or defer the requirement for a pediatric assessment, either at the company's request or by the agency's initiative. Based on discussions we have had with the FDA, we anticipate that the FDA will allow us to defer a pediatric assessment of rolapitant until after approval.

        If it concludes that an NDA does not meet the regulatory standards for approval, the FDA typically issues a Complete Response letter communicating the agency's decision not to approve the application and outlining the deficiencies in the submission. The Complete Response letter also may request additional information, including additional preclinical or clinical data. Even if such additional information and data are submitted, the FDA may decide that the NDA still does not meet the standards for approval. Data from clinical trials are not always conclusive and the FDA may interpret data differently than the sponsor. Obtaining regulatory approval often takes a number of years, involves the expenditure of substantial resources, and depends on a number of factors, including the severity of the disease in question, the availability of alternative treatments, and the risks and benefits demonstrated in clinical trials. Additionally, as a condition of approval, the FDA may impose restrictions that could affect the commercial success of a drug or require post-approval commitments, including the completion within a specified time period of additional clinical studies, which often are referred to as "Phase 4" or "post-marketing" studies.

        Post-approval modifications to the drug product, such as changes in indications, labeling, or manufacturing processes or facilities, may require a sponsor to develop additional data or conduct additional preclinical or clinical trials, to be submitted in a new or supplemental NDA, which would require FDA approval.

Post-Approval Regulation

        Once approved, products are subject to continuing regulation by the FDA. If ongoing regulatory requirements are not met or if safety problems occur after the product reaches the market, the FDA may at any time withdraw product approval or take actions that would suspend marketing. Additionally, the FDA may require post-marketing studies or clinical trials if new safety information develops.

        Good Manufacturing Practices.    Companies engaged in manufacturing drug products or their components must comply with applicable current Good Manufacturing Practice, or cGMP, requirements and product-specific regulations enforced by the FDA and other regulatory agencies. Compliance with cGMP includes adhering to requirements relating to organization of personnel, buildings and facilities, equipment, control of components and drug product containers and closures, production and process controls, packaging and labeling controls, holding and distribution, laboratory controls, and records and reports. The FDA regulates and inspects equipment, facilities, and processes used in manufacturing pharmaceutical products prior to approval. If, after receiving approval, a company makes a material change in manufacturing equipment, location, or process (all of which are, to some degree, incorporated in the NDA), additional regulatory review and approval may be required. The FDA also conducts regular, periodic visits to re-inspect equipment, facilities, and processes following the initial approval of a product. Failure to comply with applicable cGMP requirements and conditions of product approval may lead the FDA to seek sanctions, including fines, civil penalties, injunctions, suspension of manufacturing operations, operating restrictions, withdrawal of FDA approval, seizure or recall of products, and criminal prosecution. Although we periodically monitor the FDA compliance of our third-party manufacturers, we cannot be certain that our present or future third-party manufacturers will consistently comply with cGMP and other applicable FDA regulatory requirements.

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        Advertising and Promotion.    The FDA and other federal regulatory agencies closely regulate the marketing and promotion of drugs through, among other things, standards and regulations for direct-to-consumer advertising, communications regarding unapproved uses, industry-sponsored scientific and educational activities, and promotional activities involving the Internet. A product cannot be commercially promoted before it is approved. After approval, product promotion can include only those claims relating to safety and effectiveness that are consistent with the labeling approved by the FDA. Healthcare providers are permitted to prescribe drugs for "off-label" uses—that is, uses not approved by the FDA and therefore not described in the drug's labeling—because the FDA does not regulate the practice of medicine. However, FDA regulations impose stringent restrictions on manufacturers' communications regarding off-label uses. Broadly speaking, a manufacturer may not promote a drug for off-label use, but may engage in non-promotional, balanced communication regarding off-label use under certain conditions. Failure to comply with applicable FDA requirements and restrictions in this area may subject a company to adverse publicity and enforcement action by the FDA, the Department of Justice, or the Office of the Inspector General of the Department of Health and Human Services, as well as state authorities. This could subject a company to a range of penalties that could have a significant commercial impact, including civil and criminal fines and agreements that materially restrict the manner in which a company promotes or distributes drug products.

        Other Requirements.    In addition, companies that manufacture or distribute drug products or that hold approved NDAs must comply with other regulatory requirements, including submitting annual reports, reporting information about adverse drug experiences, and maintaining certain records.

Hatch-Waxman Act

        The Drug Price Competition and Patent Term Restoration Act of 1984, or the Hatch-Waxman Act, establishes two abbreviated approval pathways for drug products that are in some way follow-on versions of already approved products.

        Generic Drugs.    A generic version of an approved drug is approved by means of an Abbreviated New Drug Application, or ANDA, by which the sponsor demonstrates that the proposed product is the same as the approved, brand-name drug, which is referred to as the "reference listed drug," or RLD. Generally, an ANDA must contain data and information showing that the proposed generic product and RLD (1) have the same active ingredient, in the same strength and dosage form, to be delivered via the same route of administration, (2) are intended for the same uses, and (3) are bioequivalent. This is instead of independently demonstrating the proposed product's safety and effectiveness, which are inferred from the fact that the product is the same as the RLD, which the FDA previously found to be safe and effective.

        505(b)(2) NDAs.    If a product is similar, but not identical, to an already approved product, it may be submitted for approval via an NDA under FDC Act section 505(b)(2). Unlike an ANDA, this does not excuse the sponsor from demonstrating the proposed product's safety and effectiveness. Rather, the sponsor is permitted to rely to some degree on the FDA's finding that the RLD is safe and effective, and must submit its own product-specific data of safety and effectiveness to an extent necessary because of the differences between the products.

        RLD Patents.    An NDA sponsor must identify to the FDA patents that claim the drug substance or drug product or a method of using the drug. When the drug is approved, those patents are among the information about the product that is listed in the FDA publication, Approved Drug Products with Therapeutic Equivalence Evaluations, which is referred to as the Orange Book. The sponsor of an ANDA or 505(b)(2) application seeking to rely on an approved product as the RLD must make one of several certifications regarding each listed patent. A "Paragraph III" certification is the sponsor's statement that it will wait for the patent to expire before obtaining approval for its product. A "Paragraph IV" certification is a challenge to the patent; it is an assertion that the patent does not block approval of

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the later product, either because the patent is invalid or unenforceable or because the patent, even if valid, is not infringed by the new product.

        Regulatory Exclusivities.    The Hatch-Waxman Act provides periods of regulatory exclusivity for products that would serve as RLDs for an ANDA or 505(b)(2) application. If a product is a "new chemical entity," or NCE,—generally meaning that the active moiety has never before been approved in any drug—there is a period of five years from the product's approval during which the FDA may not accept for filing any ANDA or 505(b)(2) application for a drug with the same active moiety. An ANDA or 505(b)(2) application may be submitted after four years, however, if the sponsor makes a Paragraph IV certification challenging a listed patent. Because it takes time for the FDA to review and approve an application once it has been accepted for filing, five-year NCE exclusivity usually effectively means the ANDA or 505(b)(2) application is not approved for a period well beyond five years from approval of the RLD.

        A product that is not an NCE may qualify for a three-year period of exclusivity, if the NDA contains clinical data that were necessary for approval. In that instance, the exclusivity period does not preclude filing or review of the ANDA or 505(b)(2) application; rather, the FDA is precluded from granting final approval to the ANDA or 505(b)(2) application until three years after approval of the RLD. Additionally, the exclusivity applies only to the conditions of approval that required submission of the clinical data. For example, if an NDA is submitted for a product that is not an NCE, but that seeks approval for a new indication, and clinical data were required to demonstrate the safety or effectiveness of the product for that use, the FDA could not approve an ANDA or 505(b)(2) application for another product with that active moiety for that use.

        Once the FDA accepts for filing an ANDA or 505(b)(2) application containing a Paragraph IV certification, the applicant must within 20 days provide notice to the RLD NDA holder and patent owner that the application with patent challenge has been submitted, and provide the factual and legal basis for the applicant's assertion that the patent is invalid or not infringed. If the NDA holder or patent owner file suit against the ANDA or 505(b)(2) applicant for patent infringement within 45 days of receiving the Paragraph IV notice, the FDA is prohibited from approving the ANDA or 505(b)(2) application for a period of 30 months from the date of receipt of the notice. If the RLD has NCE exclusivity and the notice is given and suit filed during the fifth year of exclusivity, the 30-month stay does not begin until five years after the RLD approval. The FDA may approve the proposed product before the expiration of the 30-month stay if a court finds the patent invalid or not infringed or if the court shortens the period because the parties have failed to cooperate in expediting the litigation. At present, we anticipate rolapitant and TSR-011, if approved, to qualify for five-year NCE exclusivity.

        Patent Term Restoration.    Under the Hatch-Waxman Act, a portion of the patent term lost during product development and FDA review of an NDA or 505(b)(2) application is restored if approval of the application is the first permitted commercial marketing of a drug containing the active ingredient. The patent term restoration period is generally one-half the time between the effective date of the IND and the date of submission of the NDA, plus the time between the date of submission of the NDA and the date of FDA approval of the product. The maximum period of restoration is five years, and the patent cannot be extended to more than 14 years from the date of FDA approval of the product. Only one patent claiming each approved product is eligible for restoration and the patent holder must apply for restoration within 60 days of approval. The United States Patent and Trademark Office, or PTO, in consultation with the FDA, reviews and approves the application for patent term restoration. When any of our products is approved, we intend to seek patent term restoration for an applicable patent when it is appropriate. At present, we anticipate rolapitant and TSR-011, if approved, to qualify for patent term restoration.

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Other Exclusivities

        Pediatric Exclusivity.    Section 505A of the FDC Act provides for six months of additional exclusivity and patent protection if an NDA sponsor submits pediatric data that fairly respond to a written request from the FDA for such data. The data does not need to show the product to be effective in the pediatric population studied; rather, if the clinical trial is deemed to fairly respond to the FDA's request, the additional protection is granted. If reports of requested pediatric studies are submitted to and accepted by FDA within the statutory time limits, whatever statutory or regulatory periods of exclusivity or Orange Book listed patent protection cover the drug are extended by six months. This is not a patent term extension, but it effectively extends the regulatory period during which the FDA cannot approve an ANDA or 505(b)(2) application owing to regulatory exclusivity or listed patents. When any of our products is approved, we anticipate seeking pediatric exclusivity when it is appropriate.

        Orphan Drug Exclusivity.    The Orphan Drug Act provides incentives for the development of drugs intended to treat rare diseases or conditions, which generally are diseases or conditions affecting less than 200,000 individuals annually in the United States. If a sponsor demonstrates that a drug is intended to treat a rare disease or condition, the FDA grants orphan drug designation to the product for that use. The benefits of orphan drug designation include research and development tax credits and exemption from user fees. A drug that is approved for the orphan drug designated indication is granted seven years of orphan drug exclusivity. During that period, the FDA generally may not approve any other application for the same product for the same indication, although there are exceptions, most notably when the later product is shown to be clinically superior to the product with exclusivity. We intend to seek orphan drug designation and exclusivity for our products whenever it is available.

Foreign Regulation

        In addition to regulations in the United States, we will be subject to a variety of regulations in other jurisdictions governing, among other things, clinical trials and any commercial sales and distribution of our products.

        Whether or not we obtain FDA approval for a product, we must obtain the requisite approvals from regulatory authorities in foreign countries prior to the commencement of clinical trials or marketing of a product in those countries. Certain countries outside of the United States have a similar process that requires the submission of a clinical trial application much like IND prior to the commencement of clinical trials. In Europe, for example, a clinical trial application, or CTA, must be submitted to each country's national health authority and an independent ethics committee, much like the FDA and IRB, respectively. Once the CTA is approved in accordance with a country's requirements, clinical trial development may proceed.

        The requirements and process governing the conduct of clinical trials, product licensing, pricing and reimbursement vary from country to country. In all cases, the clinical trials are conducted in accordance with GCP and the applicable regulatory requirements and the ethical principles that have their origin in the Declaration of Helsinki.

        To obtain regulatory approval of an investigational drug under European Union regulatory systems, we must submit a marketing authorization application. The application used to file the NDA in the United States is similar to that required in Europe, with the exception of, among other things, country-specific document requirements.

        For other countries outside of the European Union, such as countries in Eastern Europe, Central and South America or Asia, the requirements governing the conduct of clinical trials, product licensing, pricing and reimbursement vary from country to country. In all cases, again, the clinical trials are conducted in accordance with GCP and the applicable regulatory requirements and the ethical principles that have their origin in the Declaration of Helsinki.

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        If we fail to comply with applicable foreign regulatory requirements, we may be subject to, among other things, warning letters or untitled letters, injunctions, civil or criminal penalties or monetary fines, suspension or withdrawal of regulatory approvals, suspension of ongoing clinical studies, refusal to approve pending applications or supplements to applications filed by us, suspension or the imposition of restrictions on operations, product recalls, the refusal to permit the import or export of our products or the seizure or detention of products.

Coverage and Reimbursement

        Significant uncertainty exists as to the coverage and reimbursement status of any products for which we may obtain regulatory approval. Sales of any of our product candidates, if approved, will depend, in part, on the extent to which the costs of the products will be covered by third-party payors, including government healthcare programs such as Medicare and Medicaid, commercial health insurers and managed care organizations. The process for determining whether a payor will provide coverage for a product may be separate from the process for setting the price or reimbursement rate that the payor will pay for the product once coverage is approved. Third party payors may limit coverage to specific products on an approved list, or formulary, which might not include all of the FDA approved products for a particular indication.

        In order to secure coverage and reimbursement for any product that might be approved for sale, we may need to conduct expensive pharmacoeconomic studies in order to demonstrate the medical necessity and cost-effectiveness of the product, in addition to the costs required to obtain FDA or other comparable regulatory approvals. Our product candidates may not be considered medically necessary or cost-effective. A payor's decision to provide coverage for a product does not imply that an adequate reimbursement rate will be approved. Third party reimbursement may not be sufficient to enable us to maintain price levels high enough to realize an appropriate return on our investment in product development.

        The containment of healthcare costs has become a priority of federal, state and foreign governments, and the prices of drugs have been a focus in this effort. Government healthcare programs and other third party payors are increasingly challenging the prices charged for medical products and services and examining the medical necessity and cost-effectiveness of medical products and services, in addition to their safety and efficacy. If these payors do not consider our products to be cost-effective compared to other available therapies, they may not cover our products after approval as a benefit under their plans or, if they do, the level of payment may not be sufficient to allow us to sell our products at a profit. The United States government, state legislatures and foreign governments also have shown significant interest in implementing cost-containment programs to limit the growth of government-paid healthcare costs, including price controls, restrictions on reimbursement and requirements for substitution of generic products for branded prescription drugs. Adoption of such controls and measures, and tightening of restrictive policies in jurisdictions with existing controls and measures, could limit payments for products such as the product candidates that we are developing and could adversely affect our net revenue and results.

        The marketability of any products for which we receive regulatory approval for commercial sale may suffer if the government and third-party payors fail to provide adequate coverage and reimbursement. In addition, emphasis on managed care in the United States has increased and we expect will continue to increase the pressure on drug pricing. Coverage policies, third-party reimbursement rates and drug pricing regulation may change at any time. In particular, the Affordable Care Act contains provisions that may reduce the profitability of drug products, including, for example, increased rebates for covered outpatient drugs sold to Medicaid programs, extension of Medicaid rebates to Medicaid managed care plans, mandatory discounts for certain Medicare Part D beneficiaries, and annual fees based on pharmaceutical companies' share of sales to federal healthcare programs. Even if favorable coverage and reimbursement status is attained for one or more products

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for which we receive regulatory approval, less favorable coverage policies and reimbursement rates may be implemented in the future.

Fraud and Abuse Laws

        In addition to FDA restrictions on marketing of pharmaceutical products, several other types of state and federal laws have been applied to restrict certain marketing practices in the pharmaceutical industry in recent years. These laws include anti-kickback and false claims statutes.

        The federal healthcare program anti-kickback statute prohibits, among other things, knowingly and willfully offering, paying, soliciting or receiving remuneration to induce or in return for purchasing, leasing, ordering or arranging for the purchase, lease or order of any healthcare item or service reimbursable under Medicare, Medicaid or other federally financed healthcare programs. This statute has been interpreted to apply to arrangements between pharmaceutical manufacturers on one hand and prescribers, purchasers, and formulary managers on the other. Although there are a number of statutory exemptions and regulatory safe harbors protecting certain common activities from prosecution, the exemptions and safe harbors are drawn narrowly and practices that involve remuneration intended to induce prescribing, purchasing or recommending may be subject to scrutiny if they do not qualify for an exemption or safe harbor. Our practices may not in all cases meet all of the criteria for safe harbor protection from anti-kickback liability.

        Federal false claims laws prohibit any person from knowingly presenting, or causing to be presented, a false claim for payment to the federal government, or knowingly making, or causing to be made, a false statement to get a false claim paid. In recent years, several pharmaceutical and other healthcare companies have been prosecuted under these laws for allegedly providing free product to customers with the expectation that the customers would bill federal programs for the product. Other companies have been prosecuted for causing false claims to be submitted because of the company's marketing the product for unapproved, and thus non-reimbursable, uses. In addition, violation of the federal anti-kickback statute may be actionable under the federal false claims laws.

        The Health Insurance Portability and Accountability Act of 1996, or HIPAA, also created several new federal crimes, including healthcare fraud, and false statements relating to healthcare matters. The healthcare fraud statute prohibits knowingly and willfully executing a scheme to defraud any healthcare benefit program, including private third-party payors. The false statements statute prohibits knowingly and willfully falsifying, concealing or covering up a material fact or making any materially false, fictitious or fraudulent statement in connection with the delivery of or payment for healthcare benefits, items or services.

        The majority of states also have statutes or regulations similar to the federal anti-kickback and false claims laws, which apply to items and services reimbursed under Medicaid and other state programs, or, in several states, apply regardless of the payor.

        Sanctions under these federal and state laws may include civil monetary penalties, exclusion of a manufacturer's products from reimbursement under government programs, criminal fines and imprisonment.

        In addition, the United States Foreign Corrupt Practices Act prohibits corporations and individuals from engaging in certain activities to obtain or retain business or to influence a person working in an official capacity. It is illegal to pay, offer to pay or authorize the payment of anything of value to any official of another country, government staff member, political party or political candidate in an attempt to obtain or retain business or to otherwise influence a person working in that capacity.

        Because of the breadth of these various fraud and abuse laws, it is possible that some of our business activities could be subject to challenge under one or more of such laws. Such a challenge could have material adverse effects on our business, financial condition and results of operations.

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Patents and Proprietary Rights

        We have in-licensed two patent portfolios, one each for rolapitant and our ALK program.

        Our NK-1 receptor antagonist portfolio, which relates to rolapitant, consists of eight patent families currently being prosecuted or maintained, which include applications and patents directed to compositions of matter, formulations (including oral and IV), solid forms, methods of treatment (including both delayed and acute onset nausea and/or vomiting and timing of administration in relation to chemotherapy) and methods of preparing rolapitant. Rolapitant is a NK-1 receptor antagonist being developed for the prevention of chemotherapy-induced nausea and/or vomiting. As of March 1, 2012, the portfolio licensed for rolapitant consists of six issued United States patents and 70 issued non-United States patents across the eight families. In the patent family covering the composition of matter, we have two issued United States patents and 58 issued non-United States patents, including Australia, Canada, Columbia, Europe, Hong Kong, India, Indonesia, Japan, Malaysia, Mexico, New Zealand, Norway, Peru, Philippines, Russia, Singapore, South Africa and Taiwan. We are actively pursuing nine United States patent applications and 112 non-United States applications in 29 jurisdictions.

        Our anaplastic lymphoma kinase portfolio consists of three patent families directed to both compositions of matter and methods of treating certain cancer sub-populations whose tumors express mutant ALK protein. These are currently at a very early stage of prosecution and a number of the applications have not yet been published. The three families consist of four provisional United States patent applications (two pending and two expired) and two Patent Cooperation Treaty applications. The national phase deadlines for conversion of the PCT applications to the national phase expire between November 2012 and March 2013, depending on the family.

Intellectual Property Protection Strategy

        We currently seek, and intend to continue seeking patent protection whenever available for any patentable aspects of our existing products or product candidates and related technology or any new products or product candidates we acquire in the future. Where our intellectual property is not protectable by patents, we seek to protect this through other means, including maintenance of trade secrets and careful protection of our proprietary information. Our licenses from OPKO for rolapitant and from Amgen for TSR-011 grant us the right to control all prosecution and maintenance activities for the licensed compounds, at our sole discretion.

        The patent positions of biopharmaceutical companies like us are generally uncertain and involve complex legal, scientific and factual questions. In addition, the coverage claimed in a patent application can be significantly reduced before the patent is issued, and its scope can be reinterpreted after issuance. Consequently, we do not know whether any of the product candidates we in-license or acquire will be protectable or remain protected by enforceable patents. We cannot predict whether the patent applications we are currently pursuing will issue as patents in any particular jurisdiction, and furthermore, we cannot determine whether the claims of any issued patents will provide sufficient proprietary protection to protect us from competitors, or will be challenged, circumvented or invalidated by third parties. Because patent applications in the United States and certain other jurisdictions are maintained in secrecy for 18 months, and since publication of discoveries in the scientific or patent literature often lags behind actual discoveries, we cannot be certain of the priority of inventions covered by pending patent applications. This potential issue is exacerbated by the fact that currently, in the United States, the first to make the claimed invention is entitled to the patent. In March 2013, the United States will transition to a 'first to file' system in which the first inventor to file a patent application will be entitled to the patent. Moreover, we may have to participate in interference proceedings declared by the PTO or a foreign patent office to determine priority of invention and/or in post-grant challenge proceedings (such as oppositions) that challenge priority of

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invention or other features of patentability. Such proceedings could result in substantial cost, even if the eventual outcome is favorable to us.

        Although we currently have issued patents covering a number of different attributes of our products, and pending applications on others, there can be no assurance that any issued patents would be held valid by a court of competent jurisdiction. An adverse outcome could subject us to significant liabilities to third parties, require disputed rights to be licensed from third parties or require us to cease using specific compounds or technology. To the extent prudent, we intend to bring litigation against third parties that we believe are infringing our patents.

        The term of individual patents depends upon the legal term of the patents in the countries in which they are obtained. In most countries in which we file, the patent term is 20 years from the earliest date of filing a non-provisional patent application. In the United States, a patent's term may be lengthened by patent term adjustment, which compensates a patentee for administrative delays by the PTO in granting a patent, or may be shortened if a patent is terminally disclaimed over another patent.

        In the United States, the patent term of a patent that covers an FDA-approved drug may also be eligible for patent term extension, which permits patent term restoration as compensation for the patent term lost during the FDA regulatory review process. The Hatch-Waxman Act permits a patent term extension of up to five years beyond the expiration of the patent. The length of the patent term extension is related to the length of time the drug is under regulatory review. Patent extension cannot extend the remaining term of a patent beyond a total of 14 years from the date of product approval and only one patent applicable to an approved drug may be extended. Similar provisions are available in Europe and other non-U.S. jurisdictions to extend the term of a patent that covers an approved drug. In the future, if and when our pharmaceutical products receive FDA approval, we expect to apply for patent term extensions on patents covering those products. We intend to seek patent term adjustments and extensions to any of our issued patents in any jurisdiction where these are available, however there is no guarantee that the applicable authorities, including the FDA in the United States, will agree with our assessment of whether such extensions should be granted, and even if granted, the length of such adjustments or extensions.

        To protect our rights to any of our issued patents and proprietary information, we may need to litigate against infringing third parties, or avail ourselves of the courts or participate in hearings to determine the scope and validity of those patents or other proprietary rights. These types of proceedings are often costly and could be very time-consuming to us, and we cannot be certain that the deciding authorities will rule in our favor. An unfavorable decision could result in the invalidation or a limitation in the scope of our patents or forfeiture of the rights associated with our patents or pending patent applications. Any such decision could result in our key technologies not being protectable, allowing third parties to use our technology without being required to pay us licensing fees or may compel us to license needed technologies from third parties to avoid infringing third-party patent and proprietary rights. Such a decision could even result in the invalidation or a limitation in the scope of our patents or could cause us to lose our rights under existing issued patents or not to have rights granted under our pending patent applications.

        In addition we intend to seek orphan drug status in jurisdictions in which it is available. An orphan drug designation may be granted where a drug is developed specifically to treat a rare or uncommon medical treatment. If a product which has an orphan drug designation subsequently receives the first regulatory approval for the indication for which it has such designation, the product is entitled to orphan exclusivity, meaning that the applicable regulatory authority may not approve any other applications to market the same drug for the same indication, except in certain very limited circumstances, for a period of seven years in the United States and ten years in the European Union. Orphan drug designation does not prevent competitors from developing or marketing different drugs for an indication.

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        We also rely on trade secret protection for our confidential and proprietary information. Although we take steps to protect our proprietary information and trade secrets, including through contractual means with our employees and consultants, no assurance can be given that others will not independently develop substantially equivalent proprietary information and techniques or otherwise gain access to our trade secrets or disclose such technology, or that we can meaningfully protect our trade secrets. It is our policy to require our employees, consultants, outside scientific collaborators, sponsored researchers and other advisors to execute confidentiality agreements upon the commencement of employment or consulting relationships with us. These agreements provide that all confidential information developed or made known to the individual during the course of the individual's relationship with us is to be kept confidential and not disclosed to third parties except in specific circumstances. In the case of employees, the agreements provide that all inventions conceived by the individual shall be our exclusive property. There can be no assurance, however, that these agreements will provide meaningful protection or adequate remedies for our trade secrets in the event of unauthorized use or disclosure of such information.

NK-1 Receptor Antagonists

        We have an exclusive, worldwide license from OPKO to a portfolio of patents related to rolapitant, including issued claims covering the composition of matter and certain formulations and methods of use.

        United States Patent 7,049,320 claims composition of matter for the chemical composition of rolapitant, and a sister patent claims compositions of matter of related compounds. Corresponding applications and issued patents in 57 foreign jurisdictions have similar composition of matter claims. This family of patents and/or applications has a patent term of at least until December 17, 2022. Some jurisdictions, including the United States, permit adjustment of patent term on the basis of delay before the relevant patent office. The patent term adjustment for United States Patent 7,049,320 is 356 days. United States Patent 7,049,320 therefore expires on December 8, 2023.

        Many jurisdictions also grant extensions of patent term, typically up to five years, for post-issuance regulatory delay. Only one patent may be extended per approved product. We believe that patent term extension under the Hatch-Waxman Act could be available to extend our patent exclusivity for rolapitant by up to five years in the United States depending on timing of our first approval. In Europe, we believe that patent term extension under supplementary protection certificate could also be available for an additional five years depending on timing of our first approval. There is no guarantee that the maximum allowable extension will be granted, and any extension granted may be shorter than this, or not granted at all.

        United States Patent 7,563,801 claims oral pharmaceutical formulations of rolapitant, including capsule formulations. A sister patent, United States Patent 7,981,905, claims methods of treating nausea and/or emesis by administration of pharmaceutical formulations of rolapitant. Corresponding patents and applications in 23 foreign jurisdictions similarly have claims directed to pharmaceutical formulations of rolapitant and uses thereof. This family of patents and/or applications has a patent term of at least until April 4, 2027.

        A patent application directed to the hydrochloride monohydrate polymorphic form of the chemical composition of rolapitant is allowed in the United States. Corresponding applications and issued patents in 14 foreign jurisdictions have similar claims to various polymorphic forms of rolapitant. This family of patents and/or applications has a patent term of at least until April 4, 2027.

        Patent applications directed towards a tablet formulation of rolapitant are also pending in the United States and 11 other jurisdictions, which, if issued, would expire in 2028. Patent applications directed towards IV formulations of rolapitant (including in the form of a micelle formulation) are pending in the United States and 13 foreign jurisdictions. If issued, this family of patents would expire

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in 2030. We have also filed patent applications directed to methods of synthesizing the chemical composition of rolapitant, including the current commercial synthesis, which, if issued, would expire in 2028 and 2029, respectively.

Anaplastic Lymphoma Kinase (ALK)

        We have an exclusive, worldwide license from Amgen to a portfolio of patents related to inhibitors of anaplastic lymphoma kinase. Our ALK portfolio consists of three patent families, two of which are published, that are directed to both novel compositions of matter and methods of treating certain cancer sub-populations whose tumors express an ALK fusion protein. These applications, if issued, would expire in 2031 and 2032.

Manufacturing

        We currently contract with third parties for the manufacture of our product candidates for preclinical studies and clinical trials and intend to do so in the future. We currently work with one contract manufacturer, or CMO, for the production of rolapitant drug substance and one CMO for the production of a rolapitant oral drug product for Phase 3 clinical trials. A CMO has manufactured TSR-011 for use in preclinical experiments and is currently manufacturing material to be utilized in Phase 1 clinical trials. We may elect to pursue other CMOs for manufacturing clinical supplies for later-stage trials and for commercialization. We do not own or operate manufacturing facilities for the production of clinical quantities of our product candidates. We currently have no plans to build our own clinical or commercial scale manufacturing capabilities. To meet our projected needs for clinical supplies to support our activities through regulatory approval and commercial manufacturing, the CMOs with whom we currently work will need to increase scale of production or we will need to secure alternate suppliers. Although we rely on CMOs, we have personnel with manufacturing experience who are responsible for the relationships with our CMOs.

        Following selection of the final commercial dosage form and presentation for rolapitant, we anticipate that our CMO will scale the process and manufacture three registration batches in 2013 to gain experience with the manufacturing process and to provide the required stability data for inclusion in the NDA. Stability testing will continue for at least two years. We anticipate that some of this drug product will be needed to support clinical studies.

Employees

        As of March 1, 2012, we had 18 full-time employees, seven of whom hold Ph.D. or M.D. degrees. Of these full time employees, 16 were engaged in development activities and two were engaged in support administration, including business development and finance. None of our employees are represented by labor unions or covered by collective bargaining agreements. We consider our relationship with our employees to be good.

Facilities

        Our offices are located at a 13,576 square foot facility in Waltham, Massachusetts used primarily for corporate functions. Our lease for this space expires in March 2013. We believe that our existing facility is sufficient for our needs for the foreseeable future.

Legal Proceedings

        We are not currently a party to any material legal proceedings.

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MANAGEMENT

Executive Officers and Directors

        The following table sets forth information about our current directors and executive officers, including their ages, as of December 31, 2011.

Name
  Age   Position

Leon O. Moulder, Jr. 

  54   Chief Executive Officer, Director

Mary Lynne Hedley, Ph.D. 

  49   President and Chief Scientific Officer, Director

Richard J. Rodgers

  45   Executive Vice President, Chief Financial Officer, Secretary and Treasurer

David M. Mott(2)(3)

  46   Chairman of the Board of Directors

Lawrence M. Alleva(1)

  62   Director

Arnold L. Oronsky, Ph.D.(1)(2)

  72   Director

Beth Seidenberg, M.D.(3)

  55   Director

Paul Walker

  37   Director

(1)
Audit Committee member

(2)
Governance and Nominating Committee member

(3)
Compensation Committee member

        Leon (Lonnie) O. Moulder, Jr. has served as Chief Executive Officer and as a member of our board of directors since co-founding the Company in March 2010. From April 2009 to January 2010, Mr. Moulder served as vice chairman of the board of directors and president and chief executive officer of Abraxis BioScience, Inc., a biotechnology company, and as president and chief executive officer of its wholly owned operating subsidiary, Abraxis BioScience, LLC, and the Abraxis Oncology division. Before that, Mr. Moulder served as vice chairman and executive vice president of Eisai Corporation of North America, from January 2008 until January 2009, following Eisai Co. Ltd.'s acquisition of MGI PHARMA, Inc., a pharmaceutical company, in January 2008. Mr. Moulder served as president and chief executive officer and as member of the board of directors of MGI PHARMA, Inc. from May 2003 through January 2008. Mr. Moulder joined MGI PHARMA, Inc. in September 1999 as executive vice president and was promoted to president and chief operating officer in May 2002. Mr. Moulder earned a bachelor of science degree in pharmacy from Temple University and master of business administration degree from the University of Chicago. Mr. Moulder currently serves as a director of Cubist Pharmaceuticals, Inc. (NASDAQ:CBST), a publicly held biopharmaceutical company, and Trevena, Inc. Our board of directors believes Mr. Moulder's perspective and experience as our co-founder and Chief Executive Officer, as well as his depth of operating and senior management experience in our industry and his experience serving on the boards of directors of public and private companies in the life sciences industry, provides him with the qualifications and skills to serve as a director.

        Mary Lynne Hedley, Ph.D. has served as our President and Chief Scientific Officer and as a member of our board of directors since co-founding the Company in March 2010. From July 2009 to February, Dr. Hedley served as executive vice president of operations and chief scientific officer of Abraxis BioScience, Inc., a biotechnology company. Dr. Hedley served as executive vice president of Eisai Corporation of North America from January 2008 until July 2009, following Eisai Co. Ltd.'s acquisition of MGI PHARMA, Inc. in January 2008. Dr. Hedley served in various positions at MGI PHARMA, Inc. from 2004 through its acquisition in January 2008, most recently as executive vice president and chief scientific officer. Prior to that, Dr. Hedley co-founded and served as the president and chief executive officer of ZYCOS, Inc., a biotechnology company, which was acquired by MGI PHARMA, Inc. in 2004. Prior to co-founding Zycos, Dr. Hedley completed two consecutive postdoctoral fellowships at Harvard University. Dr. Hedley earned her bachelor of science degree in microbiology from Purdue University and her doctoral degree in Immunology from the University of

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Texas, Southwestern Medical Center. Our board of directors believes Dr. Hedley's perspective and experience as our co-founder and President, as well as her educational background and operating and management experience in the life sciences industry, provides her with the qualifications and skills to serve as a director.

        Richard J. Rodgers has served as our Executive Vice President, Chief Financial Officer, Secretary and Treasurer since co-founding the Company in March 2010. Mr. Rodgers previously served as the senior vice president of finance and administration of Abraxis BioScience, Inc., a biotechnology company, from June 2009 to February 2010 and as its chief financial officer from July 2009 to February 2010. Prior to that, Mr. Rodgers served as senior vice president, controller and chief accounting officer of MGI PHARMA, Inc. from 2004 until it acquisition by Eisai Co. Ltd. in January 2008. Mr. Rodgers has held finance and accounting positions at several private and public companies, including Arthur Anderson & Co. Mr. Rodgers earned his bachelor of science degree in financial accounting from St. Cloud State University and his master of business administration degree in Finance from the University of Minnesota, Carlson School of Business. Mr. Rodgers is a Certified Public Accountant.

        David M. Mott has served on our board of directors since May 2010 and as the Chairman of the board of directors since July 2011. Mr. Mott has served as a general partner of New Enterprise Associates, an investment firm focused on venture capital and growth equity investments, since September 2008, where he leads the healthcare investing practice. From 1992 until 2008, Mr. Mott worked at MedImmune Limited, a biotechnology company and subsidiary of AstraZeneca Plc (NYSE:AZN), and served in numerous roles during his tenure including chief financial officer, president and chief operating officer, and most recently as chief executive officer from October 2000 to July 2008. During that time, Mr. Mott also served as executive vice president of AstraZeneca Plc from June 2007 to July 2008 following AstraZeneca Plc's acquisition of MedImmune Limited in June 2007. Prior to joining MedImmune Limited, Mr. Mott was a vice president in the healthcare investment banking group at Smith Barney, Harris Upham & Co. Inc. Mr. Mott received a bachelor of arts degree from Dartmouth College. Mr. Mott also serves as the chairman of the boards of directors for 3-V Biosciences, Inc. and Zyngenia, Inc., and serves on the board of directors of Ardelyx, Inc., Epizyme, Inc., Omthera Pharmaceuticals, Inc. and Prosensa. Our board of directors believes Mr. Mott's experience in the life sciences industry as a senior executive and venture capitalist, as well as his service on the boards of directors of other life sciences companies, provides him with the qualifications and skills to serve as a director.

        Lawrence (Larry) M. Alleva was appointed to our board of directors in March 2012. Mr. Alleva is currently retired. Prior to his retirement in June 2010, Mr. Alleva was employed by PriceWaterhouseCoopers LLP, or PWC, for 39 years, 28 of which as a partner with the firm. Mr. Alleva served clients primarily in the technology sector, including pharmaceutical and biotechnology companies. Additionally, he served in a variety of office and regional practice leadership roles, most recently as ethics and compliance leader (assurance) for PWC from 2006 until his retirement. Mr. Alleva is a Certified Public Accountant (inactive). Mr. Alleva received a bachelor of science degree in accounting from Ithaca College and attended Columbia University's Executive MBA Program. Mr. Alleva also serves as a director for GlobalLogic, Inc. Our board of directors believes Mr. Alleva's extensive experience and expertise working with public companies on corporate finance and accounting matters as a Certified Public Accountant (inactive), as well as his experience in a senior leadership role at PWC, provides him with the qualifications and skills to serve as a director.

        Arnold L. Oronsky, Ph.D. has served on our board of directors since June 2011. Dr. Oronsky has been a general partner with InterWest Partners, a venture capital firm, since 1994, focusing primarily on life science companies. Dr. Oronsky also serves as a senior lecturer at Johns Hopkins Medical School. Prior to joining InterWest Partners, Dr. Oronsky served as the vice president for discovery research at the Lederle Laboratories division of American Cyanamid Company. Dr. Oronsky holds a Ph.D. in immunology from Columbia University and an A.B. degree from New York University.

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Dr. Oronsky serves as chairman of the board of directors for Dynavax Technologies (NASDAQ: DVAX), a publicly held biotechnology company, as well as several privately held life science companies. Our board of directors believes Dr. Oronsky's experience in the life sciences industry as a venture capitalist, his educational background and his service on the boards of directors of other public and private life sciences companies, provides him with the qualifications and skills to serve as a director.

        Beth Seidenberg, M.D. has served on our board of directors since June 2011. Dr. Seidenberg has been a partner at Kleiner Perkins Caufield & Byers, a venture capital firm, since May 2005, where she has primarily focused on life science investing. Dr. Seidenberg was previously the senior vice president, head of global development and chief medical officer at Amgen, Inc. (NASDAQ: AMGN), a biotechnology company. In addition, Dr. Seidenberg was a senior executive in research and development at Bristol Myers Squibb Company (NYSE: BMY), a biopharmaceutical company, and Merck & Co., Inc. (NYSE: MRK), a healthcare company. Dr. Seidenberg received her bachelor of science degree from Barnard College and her medical degree from the University of Miami School of Medicine and completed her post-graduate training at Johns Hopkins University and the National Institutes of Health. Dr. Seidenberg serves on the board of directors of: Auxogyn, Inc., 3-V Biosciences, Inc., Breathe Technologies, Inc., Epizyme, Inc., iPierian Inc. and Redbrick Health Corporation. Our board of directors believes Dr. Seidenberg's training as a physician, as well as her experience in the life sciences industry as a senior executive and venture capitalist, provides her with the qualifications and skills to serve as a director.

        Paul Walker has served on our board of directors since May 2010. Mr. Walker has served as a partner of New Enterprise Associates, an investment firm focused on venture capital and growth equity investments, since May 2008, where he has primarily focused on later-stage biotechnology and life sciences investments. From January 2001 to March 2008, Mr. Walker worked at MPM Capital, a life science venture capital firm, as a general partner with the MPM BioEquities Fund. From July 1996 to December 2000, Mr. Walker served as portfolio manager at Franklin Templeton Investments. Mr. Walker received a bachelor of science degree in biochemistry and cell biology from the University of California at San Diego. Our board of directors believes Mr. Walker's experience in the life sciences industry as an investor and venture capitalist, as well as his educational background, provides him with the qualifications and skills to serve as a director.

Composition of the Board of Directors

        Our amended and restated bylaws provide that our board of directors shall consist of no less than one person. The exact number of members of our board of directors will be determined from time to time by resolution of our board of directors. Our board of directors currently consists of seven directors, five of whom, including Drs. Oronsky and Seidenberg and Messrs. Mott, Walker and Alleva, qualify as independent directors under the corporate governance standards of the NASDAQ Global Market.

Voting Arrangements

        Pursuant to a voting agreement that we entered into with certain holders of our common stock and certain holders of our preferred stock:

    the holders of outstanding shares of common stock have the right to nominate two directors to our board of directors, one of whom must be our Chief Executive Officer;

    New Enterprise Associates 13, L. P. (or its affiliates) has the right to nominate two directors to our board of directors;

    KPCB Holdings, Inc. (or its affiliates) has the right to nominate a director to our board of directors;

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    InterWest Partners X, L. P. (or its affiliates) has the right to nominate a director to our board of directors; and

    the holders of a majority of our common stock and the holders of a majority of our preferred stock have the right to nominate the remaining director, who must be an outside industry expert, to our board of directors,

and the holders of our common stock and preferred stock who are parties to the voting agreement are obligated to vote for such nominee. The provisions of this voting agreement will terminate upon the completion of this offering and there will be no further contractual obligations regarding the election of our directors. Our directors hold office until their successors have been elected and qualified or appointed, or the earlier of their death, resignation or removal.

Independence of the Board of Directors and Board Committees

        Rule 5605 of the NASDAQ Marketplace Rules requires a majority of a listed company's board of directors to be comprised of independent directors within one year of listing. In addition, the NASDAQ Marketplace Rules require that, subject to specified exceptions, each member of a listed company's audit, compensation and nominating and governance committees be independent and that audit committee members also satisfy independence criteria set forth in Rule 10A-3 under the Exchange Act. Under Rule 5605(a)(2), a director will only qualify as an "independent director" if, in the opinion of our board of directors, that person does not have a relationship that would interfere with the exercise of independent judgment in carrying out the responsibilities of a director. In order to be considered independent for purposes of Rule 10A-3, a member of an audit committee of a listed company may not, other than in his or her capacity as a member of the audit committee, the board of directors, or any other board committee: (1) accept, directly or indirectly, any consulting, advisory, or other compensatory fee from the listed company or any of its subsidiaries; or (2) be an affiliated person of the listed company or any of its subsidiaries.

        In                              , 2012, our board of directors undertook a review of the composition of our board of directors and its committees and the independence of each director. Based upon information requested from and provided by each director concerning his or her background, employment and affiliations, including family and other relationships, including those relationships described under "Certain Relationships and Related Party Transactions," our board of directors has determined that none of Drs. Oronsky and Seidenberg and Messrs. Mott, Walker and Alleva, representing five of our seven directors, has a relationship that would interfere with the exercise of independent judgment in carrying out the responsibilities of a director and that each of these directors is "independent" as that term is defined under Rule 5605(a)(2) of the NASDAQ Marketplace Rules. Mr. Moulder and Dr. Hedley are each not considered independent because they serve as our Chief Executive Officer and our President and Chief Scientific Officer, respectively. Our board of directors also determined that Dr. Oronsky, Mr. Alleva and                         , who comprise our audit committee, Mr. Mott and Dr. Seidenberg, who comprise our compensation committee, and Mr. Mott and Dr. Oronsky, who comprise our governance and nominating committee, satisfy the independence standards for such committees established by the SEC and the NASDAQ Marketplace Rules, as applicable. In making these determinations on the independence of our directors, our board of directors considered the relationships that each such non-employee director has with our company and all other facts and circumstances our board of directors deemed relevant in determining independence, including the beneficial ownership of our capital stock by each non-employee director.

Board Leadership Structure and the Role of the Board in Risk Oversight

Board Leadership Structure

        The positions of our Chairman of the Board and Chief Executive Officer are separated. Separating these positions allows our Chief Executive Officer to focus on our day-to-day business, while allowing

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the Chairman of the Board to lead the board of directors in its fundamental role of providing advice to and independent oversight of management. Our board of directors recognizes the time, effort and energy that the Chief Executive Officer must devote to his position in the current business environment, as well as the commitment required to serve as our Chairman, particularly as the board of directors' oversight responsibilities continue to grow. Our board of directors also believes that this structure ensures a greater role for the independent directors in the oversight of the Company and active participation of the independent directors in setting agendas and establishing priorities and procedures for the work of our board of directors.

        Although our amended and restated bylaws that will be in effect upon the closing of this offering will not require that the Chairman of the Board and Chief Executive Officer position be separate, our board of directors believes that having separate positions is the appropriate leadership structure for us at this time. The board recognizes that depending on the circumstances, other leadership models, such as combining the role of Chairman of the Board with the role of Chief Executive Officer, might be appropriate. Accordingly, the board may periodically review its leadership structure.

        Our independent directors will meet alone in executive session at no less than four regular meetings of our board of directors each year. Additional executive sessions of the independent directors may be called at any time by the Chairman of the Board, and shall be called by the Chairman of the Board at the request of a majority of the independent directors. The purpose of these executive sessions is to promote open and candid discussion among non-employee directors.

Role of the Board in Risk Oversight

        We face a number of risks, including those described under the caption "Risk Factors" contained elsewhere in this prospectus. The board of directors believes that risk management is an important part of establishing, updating and executing on the Company's business strategy. The board of directors, as a whole and at the committee level, has oversight responsibility relating to risks that could affect the corporate strategy, business objectives, compliance, operations, and the financial condition and performance of the Company. The board of directors focuses its oversight on the most significant risks facing the Company and on its processes to identify, prioritize, assess, manage and mitigate those risks. The board of directors and its committees receive regular reports from members of the Company's senior management on areas of material risk to the Company, including strategic, operational, financial, legal and regulatory risks. While the board of directors has an oversight role, management is principally tasked with direct responsibility for management and assessment of risks and the implementation of processes and controls to mitigate their effects on the Company.

        The audit committee, as part of its responsibilities oversees the management of financial risks, including but not limited to accounting matters, liquidity and credit risks, corporate tax positions, insurance coverage, and cash investment strategy and results. The audit committee is also responsible for overseeing the management of risks relating to the performance of its independent registered public accounting firm, as well as our systems of internal controls and disclosure controls and procedures. The compensation committee is responsible for overseeing the management of risks relating to our executive compensation and overall compensation and benefit strategies, plans, arrangements, practices and policies, and compensation of the board of directors. The governance and nominating committee oversees the management of risks associated with the overall compliance and corporate governance practices, and the independence and composition of the board of directors. These committees provide regular reports, on at least a quarterly basis, to the full board of directors.

Director Compensation

        For a discussion of our director compensation arrangements, see "Executive and Director Compensation—Director Compensation."

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Committees of the Board

        The board of directors has a standing audit committee, compensation committee and governance and nominating committee.

Audit Committee

        The audit committee is responsible for assisting the board of directors in its oversight of the integrity of our financial statements, the qualifications and independence of our independent auditors, and our internal financial and accounting controls. The audit committee has direct responsibility for the appointment, compensation, retention (including termination) and oversight of our independent auditors, and our independent auditors report directly to the audit committee. The audit committee also prepares the audit committee report that the SEC rules require to be included in our filings with the SEC.

        The members of the audit committee are Dr. Oronsky, Mr. Alleva and                        , each of whom qualifies as an independent director under the corporate governance standards of the NASDAQ Stock Market and the independence requirements of Rule 10A-3 of the Exchange Act. Our board of directors has determined that Mr. Alleva qualifies as an "audit committee financial expert" as such term is currently defined in Item 407(d)(5) of Regulation S-K. Each member of the audit committee is able to read and understand fundamental financial statements, including our balance sheet, income statement and cash flows statements. The audit committee has adopted a charter that will be posted on our website upon the closing of the offering.

Compensation Committee

        The compensation committee approves the compensation objectives for the Company, provides a recommendation on the compensation of the Chief Executive Officer, which is subject to approval by the full board of directors, and establishes the compensation for other executives. The compensation committee reviews all compensation components including base salary, bonus, benefits and other perquisites. See "Executive and Director Compensation—Compensation Discussion and Analysis" for more information regarding the role of the compensation committee, management and compensation consultants in determining or recommending the amount or form of executive compensation.

        The members of the compensation committee are Mr. Mott and Dr. Seidenberg. Each member of the compensation committee is a non-employee director within the meaning of Rule 16b-3 of the rules promulgated under the Exchange Act, each is an outside director, as defined by Section 162(m) of the United States Internal Revenue Code of 1986, as amended, or the Code, and each is an independent director, as defined by The NASDAQ Stock Market. The compensation committee has adopted a charter that will be posted on our website upon the closing of the offering.

Governance and Nominating Committee

        The governance and nominating committee is responsible for making recommendations to the board of directors regarding candidates for directorships and the size and composition of the board. In addition, the governance and nominating committee is responsible for overseeing our corporate governance guidelines and reporting and making recommendations to the board concerning corporate governance matters.

        The members of the governance and nominating committee are Mr. Mott and Dr. Oronsky. Each member of the governance and nominating committee is a non-employee director within the meaning of Rule 16b-3 of the rules promulgated under the Exchange Act and an independent director, as defined by The NASDAQ Stock Market. The governance and nominating committee has adopted a charter that will be posted on our website upon the closing of the offering.

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Corporate Governance Policies and Procedures

        We have adopted several policies to govern the activities of our Company, including a corporate governance policy and a Code of Business Conduct and Ethics.

        The corporate governance policy addresses the following topics:

    the duties and responsibilities of each director;

    the composition, responsibilities and operation of the board of directors;

    the establishment and operation of board committees;

    succession planning for our Chief Executive Officer;

    convening executive sessions of independent directors;

    the board of directors' interaction with management and third parties; and

    the evaluation of the performance of the board of directors and the Chief Executive Officer.

        The Code of Business Conduct and Ethics is designed to promote the highest standards of ethical conduct by our directors, executive officers and employees. The Code of Business Conduct and Ethics requires that our directors, executive officers and employees avoid conflicts of interest, comply with all laws and other legal requirements, conduct business in an honest and ethical manner and otherwise act with integrity and in our best interest. Under the terms of the Code of Business Conduct and Ethics, directors, executive officers and employees are required to report any conduct that they believe in good faith to be an actual or apparent violation of the Code of Business Conduct and Ethics.

        Further, we have established procedures to receive, retain and treat complaints regarding accounting, internal accounting controls and auditing matters. These procedures ensure that individuals may submit concerns regarding questionable accounting or auditing matters in a confidential and anonymous manner. The Code of Business Conduct and Ethics also prohibits the Company from retaliating against any director, executive officer or employee who reports actual or apparent violations of the Code of Business Conduct and Ethics. Upon the completion of the offering, the Code of Business Conduct and Ethics will be available on our website. We intend to disclose future amendments to the Code of Business Conduct and Ethics, or any waivers of its requirements, on our website or in filings under the Exchange Act to the extent required by the applicable rules and exchange requirements.

Compensation Committee Interlocks and Insider Participation

        None of the members of our Compensation Committee has ever been an officer or employee of the Company. None of our executive officers serves, or has served during the last fiscal year, as a member of the board of directors, compensation committee or other board committee performing equivalent functions of any entity that has one or more executive officers serving as one of our directors or on our Compensation Committee.

Limitation on Liability and Indemnification of Directors and Officers

        Our amended and restated certificate of incorporation and amended and restated bylaws limit our directors' and officers' liability to the fullest extent permitted under Delaware corporate law. Specifically, our directors and officers will not be liable to us or our stockholders for monetary damages for any breach of fiduciary duty by a director or officer, except for liability:

    for any breach of the director's or officer's duty of loyalty to us or our stockholders;

    for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law;

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    for unlawful dividends or stock repurchases under Section 174 of the Delaware General Corporation Law; or

    for any transaction from which a director or officer derives an improper personal benefit.

        If the Delaware General Corporation Law is amended to authorize corporate action further eliminating or limiting the personal liability of directors or officers, then the liability of our directors or officers shall be eliminated or limited to the fullest extent permitted by the Delaware General Corporation Law, as so amended.

        The provision regarding indemnification of our directors and officers in our amended and restated certificate of incorporation will generally not limit liability under state or federal securities laws.

        Delaware law and our amended and restated certificate of incorporation and amended and restated bylaws provide that we will, in certain situations, indemnify any person made or threatened to be made a party to a proceeding by reason of that person's former or present official capacity with us against judgments, penalties, fines, settlements and reasonable expenses. Any such person is also entitled, subject to certain limitations, to payment or reimbursement of reasonable expenses (including attorneys' fees and disbursements and court costs) in advance of the final disposition of the proceeding.

        We maintain a directors' and officers' insurance policy pursuant to which our directors and officers are insured against liability for actions taken in their capacities as directors and officers. We believe that these indemnification provisions and insurance are useful to attract and retain qualified directors and officers.

        The limitation of liability and indemnification provisions in our amended and restated certificate of incorporation and amended and restated bylaws may discourage stockholders from bringing a lawsuit against directors for breach of their fiduciary duty. These provisions may also have the effect of reducing the likelihood of derivative litigation against directors and officers, even though such an action, if successful, might otherwise benefit us and our stockholders. In addition, your investment may be adversely affected to the extent that, in a class action or direct suit, we pay the costs of settlement and damage awards against directors and officers pursuant to these indemnification provisions.

        In addition, we have entered into indemnification agreements with each of our directors and executive officers, which also provide, subject to certain exceptions, for indemnification for related expenses, including, among others, reasonable attorney's fees, judgments, fines and settlements incurred in any action or proceeding. Certain of our non-employee directors may, through their relationships with their employers, be insured and/or indemnified against certain liabilities incurred in their capacity as members of our board of directors.

        There is currently no pending material litigation or proceeding involving any of our directors, officers or employees for which indemnification is sought.

Rule 10b5—1 Sales Plans

        Our directors and executive officers may adopt written plans, known as Rule 10b5—1 plans, in which they will contract with a broker to buy or sell shares of our common stock on a periodic basis. Under a Rule 10b5—1 plan, a broker executes trades pursuant to parameters established by the director or officer when entering into the plan, without further direction from them. A director or officer can only enter into a 10b5—1 plan when he or she is not in possession of material non-public information regarding the Company. Under certain circumstances, a broker may subsequently execute trades pursuant to such plan, even if the director or officer has subsequently come into possession of material non-public information. The director or officer may amend or terminate the plan in some circumstances. Our directors and executive officers may also buy or sell additional shares outside of a Rule 10b5—1 plan when they are not in possession of material, non-public information.

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EXECUTIVE AND DIRECTOR COMPENSATION

Compensation Discussion and Analysis

        This section discusses the principles underlying our policies and decisions with respect to the compensation of our executive officers who are named in the "Summary Compensation Table" below, or our "named executive officers," and material factors relevant to an analysis of these policies and decisions. It should be read together with the related tables and disclosures that follow. Our named executive officers for the fiscal year ended December 31, 2011 were:

    Leon O. Moulder, Jr., our Chief Executive Officer;

    Mary Lynne Hedley, Ph.D., our President and Chief Scientific Officer; and

    Richard J. Rodgers, our Executive Vice President and Chief Financial Officer.

Compensation Philosophy and Objectives

        Our primary objectives with respect to compensation of our named executive officers are to retain and motivate them because we believe they have experience and competencies that are critical to achievement of our business goals. This is consistent with the overall approach of our compensation system, which is to attract, retain and motivate employees and officers who have relevant, critical skills and experience, and can make important contributions to the achievement of our business goals. We seek to achieve these objectives by setting the components of our executive compensation packages at competitive levels, by implementing annual variable incentive compensation that is tied to specific corporate goals, and by using equity awards that vest over time and that align our named executive officers' interests with the interest of our stockholders in increasing stockholder value in the long term.

        Determination of Compensation.    Our named executive officers are also our founders. The framework for each of their respective compensation packages was initially established in May 2010 when our named executive officers and New Enterprise Associates, or NEA, and its affiliates completed our Series A preferred stock financing. All of our named executive officers personally invested in the Company as part of that financing. The offer letters that were entered into at that time are described elsewhere in this prospectus under "Executive Compensation—Offer Letter Agreements." NEA is a sophisticated investor that regularly invests in emerging growth companies in the life sciences, and it determined, on an arm's-length basis in connection with its investment, that the compensation packages for our named executive officers were appropriate. We believe the arrangements reflect both market standards for venture capital-backed development stage companies and the nature and experience of our senior management team.

        For 2011, we continued to use the framework for our named executive officer's compensation that was established in May 2010. However, our compensation committee and the non-management members of our board of directors did consider adjustments to base salaries, the corporate objectives under our short-term incentive, or STI, program, and the timing, size and form of equity awards. In reviewing compensation decisions for our executive officers for 2011, our compensation committee and board of directors considered our financial condition and the contributions that the named executive officers had made to our business, and relied on its members' collective industry experience and business judgment. For example, because Mr. Mott and Dr. Seidenberg are partners in venture capital firms with many investments in portfolio companies, they were able to use their experiences working with other private companies on executive recruitment and compensation and survey data of which they were aware when making decisions on the compensation for our named executive officers. The compensation committee also considered information from Mr. Moulder, who as our Chief Executive Officer regularly discussed compensation issues with the chairperson of the compensation committee and met with the compensation committee to discuss compensation matters. Mr. Moulder also provided his evaluation of the performance of the named executive officers other than himself.

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        Our compensation committee, acting under authority delegated to it by our board of directors, makes compensation decisions regarding our named executive officers, other than our Chief Executive Officer, and for our Chief Executive Officer, the compensation committee makes formal recommendations to the board of directors, with the non-management directors making the final compensation decisions for our Chief Executive Officer.

        Our compensation committee and board of directors have not historically engaged the services of outside consultants or advisors to review and provide advice with respect to our executive officer compensation arrangements. In connection with this offering, our compensation committee has engaged Radford to serve as an independent compensation consultant to assist the compensation committee in evaluating and reviewing executive compensation and to advise it regarding executive compensation practices in our industry. In 2012, our compensation committee anticipates identifying a specified peer group of companies against which it will compare our compensation practices.

Components of our Compensation Program

        The compensation packages of our named executive officers generally consist of base salary, STI opportunities, equity awards, and benefits. Our named executive officers are also entitled to certain compensation upon termination of their employment. We believe this overall framework achieves an appropriate mix between the various elements of our compensation program in order to meet our compensation objectives and philosophy. While we believe a mix is appropriate, we have not, however, adopted any formal policies or guidelines for allocating compensation among these elements.

        Base Salary.    The base salary payable to each named executive officer is intended to provide a fixed component of compensation reflecting the executive's skill set, experience, roles and responsibilities. Base salary amounts for each named executive officer were initially set at $350,000, $300,000 and $275,000 in the offer letter agreements entered into in May 2010 by Mr. Moulder, Dr. Hedley and Mr. Rodgers, respectively. The compensation committee reviewed the base salaries for 2011 and determined that an increase was appropriate given the individual performance of each of our named executive officers and our overall performance. In particular, the compensation committee considered that in the prior year management had successfully launched the company, completed our Series A financing and in-licensed our first product candidate, rolapitant. The compensation committee also considered, however, that 2010 had been less than a full year of operation for the company and that it was appropriate for the company to be conservative in the use of cash resources. For 2011, the compensation committee recommended, and the board approved with respect to Mr. Moulder, increasing the base salary of each of our named executive officers by 2%, to $357,000, $306,000 and $280,500 for Mr. Moulder, Dr. Hedley and Mr. Rodgers, respectively.

        Short-term Incentive Payouts.    Our STI program is intended to provide a cash incentive to our named executive officers for achieving previously specified goals. We believe that having an annual incentive plan is a customary practice necessary to retain executives, and that it motivates our executives to achieve the specific goals. For 2011, the STI program was based entirely on company-wide goals and did not use any personal goals. This decision to use exclusively company-wide goals was based in part on our named executive officers having then recently founded the company together and that the early-stage nature of the company made personal rewards for performance less important than overall company success. For 2012, our STI program allows us to pay for performance, based on achievement of company-wide performance goals, as well as individual goals.

        For 2011, the company-wide goals were established by the compensation committee and approved by the board of directors. The five corporate goals used for 2011 were based on our 2011 operating plan and long term strategy, and each of the corporate goals used was weighted to reflect the committee and board of director's subjective judgments about its relative importance. If each of the corporate goals was achieved at the 100% level, then each of the named executive officers would have

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received his or her target award under the STI program. The STI program for 2011 was structured so that each named executive officer could receive a payment ranging from 0% to 150% of the target award, depending on the compensation committee's assessment of the level of performance for each of the corporate objectives.

        The target amounts for each named executive officer under the STI program were equivalent to 30% of base salary for Mr. Moulder and Dr. Hedley, and 25% of base salary for Mr. Rodgers. These percentages were negotiated and set forth in the offer letter agreements entered into in May 2010. The compensation committee determined that these levels continued to be appropriate in 2011.

        The table below sets forth the following information with respect to the five company-wide objectives for 2011 under our STI program, the relative weighting, which reflects the subjective assessment of our compensation committee of the objective's importance to our strategic plan, the level of achievement of each objective and the resulting payout expressed as a percentage of the executive's target amount.

Objective
  Weighting   Achievement   STI Payout
Percentage
 

1. Rolapitant Clinical:

                   

Enroll first patient in our Phase 3 clinical program in the fourth quarter

    30 %   70 %   21 %

2. Rolapitant Clinical:

                   

Complete bioequivalence study in the third quarter

    10 %   50 %   5 %

3. Rolapitant Chemistry Manufacturing Controls:

                   

Manufacture and ship clinical drug supply in the third quarter

    10 %   100 %   10 %

4. Capital Raising:

                   

Raise $40 million by the end of the second quarter

    30 %   150 %   45 %

5. Business Development:

                   

Acquire two additional oncology assets that meet business development criteria, by end of year

    20 %   70 %   14 %

Total

   
100

%
       
95

%

        At the beginning of 2012, the compensation committee determined, and board of directors confirmed, that company-wide objectives were achieved at the percentages specified in the table above. The first objective, related to enrolling the first patient in our Phase 3 clinical program, was determined to have been achieved at the 70% level, which reflects that significant work toward this goal was accomplished during the year, that the objective was achieved early in the first quarter of 2012, and that the reason for the change in timing was due to factors largely outside of the control of management. The second objective, related to completing a bioequivalence study in the third quarter, was determined to have been achieved at the 50% level, which reflects that the objective was achieved in the fourth quarter, including as a result of significant work by our named executive officers, and that this did not impact our development timeline. The third objective, related to manufacturing and shipping of clinical drug supply in the third quarter, was achieved on target. The fourth objective, related to additional financing, was determined to have been achieved at the maximum level, which reflects that management accomplished the objective on schedule, on favorable terms and in a much larger amount than was expected. The fifth objective, related to business development activities, was

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determined to have been achieved at the 70% level, which reflects that management negotiated an in-license in the early part of the year for a product candidate that is a strong strategic fit and has run a robust and selective process for evaluating many other opportunities.

        Equity Awards.    Our use of equity awards is intended to align our named executive officers' interests with the interest of our stockholders by providing an additional incentive to our named executive officers to focus on increasing stockholder value in the long term. Furthermore, we believe that in the biopharmaceutical industry, equity awards are a primary motivator in retaining executives. We have determined the size and frequency of awards based on numerous factors, including the executive's skills and experience, the executive's responsibilities, internal equity and the approach to setting compensation described under "—Determination of Compensation" above.

        In February 2011, our board of directors, at the recommendation of our compensation committee, granted a restricted stock award to each of our named executive officers. The compensation committee viewed this award as an annual equity award consistent with the objectives and purposes described in this Compensation Discussion and Analysis. The compensation committee used restricted stock instead of stock options because the fair market value of our common stock at the time was nominal, which meant that the exercise price of stock options would be immaterial to us and to the executive, and did not outweigh the potential for favorable tax treatment for the award recipients of restricted stock.

        In July 2011, in connection with the closing of our Series B financing, the compensation committee granted stock options to each of our named executive officers. This was a one-time award intended to counterbalance (in small part, but not in whole) the proportionate reduction in stock ownership experienced by each of our named executive officers in their capacities as founders, as a result of the size of the Series B financing.

        Benefits.    Our named executive officers are eligible to receive the same basic benefits, including retirement and health benefits that are available to our other employees. The terms of each named executive officer's offer letter agreement provide for vacation benefits and the ability to participate in our employee benefit plans on the same terms as other similarly situated executive officers.

        Payments on Termination.    Pursuant to their offer letters, each of our named executive officers are entitled to specified benefits in the event of the termination of their employment under specified circumstances, including termination following a change of control of our company. The terms of these arrangements are more fully described below under "—Offer Letter Agreements" and "—Potential Payments Upon a Termination or Change in Control." These benefits were an integral part of the agreements that were reached when the named executive officers negotiated their offer letters. Furthermore, we believe these protections are appropriate for the founders of an entrepreneurial company, and we believe that providing such benefits in the event of a change of control of our company allows our named executive officers to focus their attention on the requirements of the Company's business rather than on the implications of a transaction for them personally.

Federal Tax Considerations under Sections 162(m)

        Section 162(m) of the Internal Revenue Code of 1986, as amended, disallows a federal income tax deduction to any publicly traded corporation for any remuneration in excess of $1.0 million of compensation paid to specified executive officers in a calendar year. Compensation in excess of $1.0 million may be deducted if, among other things, it qualifies as performance-based compensation within the meaning of Section 162(m). We expect that once we are a publicly traded company our compensation committee will periodically review the potential consequences of Section 162(m) on the various elements of our executive compensation program and where reasonably practicable, will seek to structure the equity incentives component of our executive compensation program to comply with exemptions in Section 162(m). Our 2012 Omnibus Incentive Plan has been structured to facilitate this process. However, our board of directors or compensation committee may, in their judgment, authorize compensation payments that do not comply with the exemptions in Section 162(m) in situations where they believe that such payments are appropriate.

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Executive Compensation

        The following table presents summary information regarding the total compensation awarded to, earned by, or paid to our Chief Executive Officer, our President and Chief Scientific Officer and our Executive Vice President and Chief Financial Officer for services rendered to us for the year ended December 31, 2011. We refer to these individuals as our "named executive officers."

Summary Compensation Table

 
  Year   Salary
($)
  Stock
Awards
($)(1)
  Option
Awards
($)(2)
  Non-Equity
Incentive Plan
Compensation
($)(3)
  Total
($)
 

Leon O. Moulder, Jr.
Chief Executive Officer

    2011     356,731     35,625     784,969     101,668     1,278,993  

Mary Lynne Hedley, Ph.D.
President, Chief Scientific Officer

   
2011
   
305,769
   
33,375
   
713,608
   
87,144
   
1,139,896
 

Richard J. Rodgers
Executive Vice President and Chief Financial Officer

   
2011
   
280,289
   
22,500
   
267,603
   
66,569
   
636,961
 

(1)
The amounts reflect the aggregate grant date fair value of restricted stock granted during the year computed in accordance with the provisions of ASC 718. For information regarding assumptions underlying the value of stock awards, see Note 6 to our financial statements and the discussion under "Management's Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies—Stock-Based Compensation," included elsewhere in this prospectus.

(2)
The amounts reflect the aggregate grant date fair value of option awards granted during the year computed in accordance with the provisions of ASC 718. For information regarding assumptions underlying the value of stock awards, see Note 6 to our financial statements and the discussion under "Management's Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies—Stock-Based Compensation," included elsewhere in this prospectus.

(3)
The figures shown for non-equity incentive plan compensation represents amounts earned for the fiscal year ended December 31, 2011, that were paid during 2012. See "—Compensation Discussion and Analysis—Short-term Incentive Payouts" for more information.

Narrative Disclosure Relating to Summary Compensation Table

        For an explanation of the amount of salary, bonus, stock and option awards and other compensation paid to our named executive officers, please see "—Compensation Discussion and Analysis—Components of our Compensation Program," and the disclosure provided in the "Summary Compensation Table," above.

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Grants of Plan-Based Awards

        The following table provides information concerning grants of plan-based awards to each of our named executive officers during 2011.

 
   
  Estimated Possible
Payouts Under
Non-Equity Incentive
Plan Awards
  All Other
Stock
Awards:
Number of
Shares of
Stock or
Units
(#)
  All Other
Option
Awards:
Number of
Securities
Underlying
Options
(#)
   
   
 
 
   
  Exercise
or Base
Price of
Option
Awards
($/Sh)(2)
  Grant Date
Fair Value
of Stock
and Option
Awards
($)(3)
 
 
  Grant
Date
  Threshold
($)
  Target
($)(1)
  Maximum
($)
 

Leon O. Moulder, Jr. 

    2/7/2011                 237,500             35,625  

    2/16/2011         107,019     160,529                          

    7/19/2011                     1,100,000     0.38     784,969  

Mary Lynne Hedley, Ph.D. 

   
2/7/2011
   
   
   
   
222,500
   
   
   
33,375
 

    2/16/2011         91,731     137,597                          

    7/19/2011                     1,000,000     0.38     713,608  

Richard J. Rodgers

   
2/7/2011
   
   
   
   
150,000
   
   
   
22,500
 

    2/16/2011         70,072     105,108                          

    7/19/2011                     375,000     0.38     267,603  

(1)
Amounts shown as estimated possible payouts under non-equity incentive plan awards are the target and maximum cash incentive each executive was eligible to receive pursuant to the terms of our STI program. For actual amounts paid, see "—Summary Compensation Table." For more information regarding these payments, see "—Compensation Discussion and Analysis—Components of our Compensation Program—Short-term Incentive Payouts."

(2)
Amounts represent the fair value of our common stock as determined in good faith by our board of directors on the date of grant. For a description of the terms of stock options granted, please see "—Employee Benefit Plans—2010 Stock Incentive Plan."

(3)
Reflects the grant date fair value of each award computed in accordance with ASC 718. These amounts do not correspond to the actual value that will be recognized by the named executive officers. The assumptions used in the valuation of these awards are consistent with the valuation methodologies specified in Note 6 to our financial statements appearing elsewhere in this prospectus.

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Outstanding Equity Awards at Fiscal Year-End

        The following table provides information regarding equity awards held by each of our named executive officers that were outstanding as of December 31, 2011.

 
  Option Awards   Stock Awards  
Name
  Number of
Securities
Underlying
Unexercised
Options
(#)
Exercisable
  Number of
Securities
Underlying
Unexercised
Options
(#)
Unexercisable(1)
  Option
Exercise
Price
($)
  Option
Expiration
Date
  Number of
Shares or
Units That
Have Not
Vested
(#)
  Market
Value of
Shares or
Units That
Have Not
Vested
(#)
 

Leon O. Moulder, Jr. 

          1,100,000   $ 0.38     7/19/2021              

                            738,281(2 )     (4)

                            237,500(3 )     (4)

Mary Lynne Hedley, Ph.D. 

          1,000,000   $ 0.38     7/19/2021              

                            632,813(2 )     (4)

                            222,500(3 )     (4)

Richard J. Rodgers

          375,000   $ 0.38     7/19/2021              

                            210,938(2 )     (4)

                            150,000(3 )     (4)

(1)
The options held by the named executive officers were granted on July 19, 2011. On the one-year anniversary of the grant date, 25% of these options vest and, thereafter, 1/36th of the remaining options vest on each monthly anniversary of the date of grant.

(2)
The restricted stock held by the named executive officer was purchased on March 26, 2010 in connection with the founding of the Company and was 25% vested as of such date, and thereafter 1/48th of the remaining restricted stock vest on each monthly anniversary of the date of grant.

(3)
The restricted stock held by the named executive officer was granted on February 7, 2011. On the one-year anniversary of the grant date, 25% of these shares of restricted stock vest and, thereafter, 1/36th of the remaining shares vest on each monthly anniversary of the date of grant.

(4)
The market value of the stock award is based on an assumed initial public offering price of $      per share, which is the midpoint of the price range listed on the cover page of this prospectus.

Option Exercises and Stock Vested

        The following table sets forth information regarding the number of shares of stock awards acquired on vesting by our named executive officers during the fiscal year ended December 31, 2011. No options were exercised during the fiscal year ended December 31, 2011.

 
  Stock Awards  
Name
  Number of Shares
Acquired on
Vesting
(#)
  Value Realized
on Vesting
($)(1)
 

Leon O. Moulder, Jr. 

    328,125   $ 210,263  

Mary Lynne Hedley, Ph.D. 

    281,250   $ 180,225  

Richard J. Rodgers

    93,750   $ 60,075  

(1)
The value realized upon vesting is the fair value of our common stock on the vesting date multiplied by the number of shares acquired on vesting.

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Pension Benefits and Deferred Compensation

        We did not maintain any plan providing for payments or other benefits at, following, or in connection with retirement, during the fiscal year ended December 31, 2011. We did not maintain any deferred compensation plans for any named executive officer for the year ended December 31, 2011.

Offer Letter Agreements

        We have offer letter agreements with all of our named executive officers. The agreements were entered into on May 10, 2010 and are at-will arrangements. These agreements were designed to be a part of a competitive compensation package and keep our executive officers focused on our business goals and objectives. The agreements provide for base salaries, incentive compensation benefits and, in certain circumstances, severance benefits.

        The offer letter agreements with each of Mr. Moulder, Dr. Hedley and Mr. Rodgers provided for an initial base salary of $350,000, $300,000 and $275,000, respectively. Mr. Moulder, Dr. Hedley and Mr. Rodgers are also eligible for a bonus target of 30%, 30% and 25% of their respective annual base salary, payable upon attainment of objectives as determined by our board of directors. In addition to base salary and bonus, the offer letter agreements provide for vacation benefits and the ability to participate in our employee benefit plans on the same terms as other similarly situated executive officers.

        The offer letter agreements also provide the named executive officer with certain payments and benefits upon certain terminations of employment. Pursuant to the offer letter agreements, in order to receive certain severance benefits each named executive officer is required to execute a general release in favor of the Company, which includes, among other things, non-solicitation and non-disparagement provisions.

        Under the terms of the offer letter agreements, in the event that the named executive officer resigns without "Good Reason," as defined below, or their employment terminates due to death or disability (as such term is defined in the offer letter agreements), such executive is entitled to receive the following: (i) unpaid annual base salary for services rendered prior to the date of termination or resignation, (ii) any earned but unpaid annual bonus for any year prior to the year in which termination of employment occurs, (iii) reimbursement of any un-reimbursed business expenses, (iv) accrued but unused vacation pay and (v) any other payments, benefits or fringe benefits to which the executive is entitled to under the terms of any applicable compensation arrangement or benefit, equity or fringe benefit plan or program or grant (items (i) through (v) collectively referred to herein as accrued benefits). In the event that the Company terminates the executive for "Cause," as defined below, the executive will be entitled to receive all of their accrued benefits, with the exception of any earned but unpaid bonus.

        In the event the named executive officer's employment is terminated for any reason other than for "Cause," death, or disability, or if the named executive officer resigns for "Good Reason," the named executive officer is entitled, provided he or she executes a release in favor of the Company, to receive the following payments and compensation (in accordance with the Company's regular pay policies and commencing 60 days following termination):

    their accrued benefits;

    one year's base salary;

    payment of a monthly COBRA coverage premium for the earlier of (i) 12 months or (ii) the date upon which the executive commences full-time employment or employment that provides such executive with eligibility for healthcare benefits substantially comparable to those provided by the Company; and

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    the vesting of such executive's restricted stock, purchased on March 26, 2010, pursuant to the terms of their restricted stock agreement with the Company, or the Restricted Stock Agreement.

        For purposes of the offer letter agreements, termination for "Cause" shall mean termination for such named executive officer's: (i) willful misconduct or gross negligence as to a material matter in connection with their duties; (ii) act constituting material dishonesty or fraud with respect to the Company; (iii) indictment for, conviction of, or a plea of guilty or nolo contendere to, a felony under applicable law; (iv) material violation of a material term of any written Company policy made available to the executive; (v) failure to attempt in good faith to perform their duties in all material respects or follow a clear, lawful and reasonable directive of the board of directors; or (vi) material breach of fiduciary duty owed to the Company that has caused or could reasonably be expected to cause a material injury to the Company's business; provided, however, that the Company has provided the executive with written notice of the existence of such event or circumstance and, with respect to the circumstances in clauses (iv) and (v) only, the executive fails to substantially cure the event or circumstance identified within 30 days of receipt of such notice. A resignation by the named executive officer shall be deemed a resignation for "Good Reason" if the executive provides written notice to the Company of the specific circumstances alleged to constitute Good Reason within 90 days after any one or more of the following events: (i) the executive is required to report to another person other than the board of directors, in the case of Mr. Moulder, and the Chief Executive Officer, in the case of Dr. Hedley and Mr. Rodgers, or the assignment to the executive of any duties or responsibilities which result in the material diminution of the executive's position as, in the case of Mr. Moulder, the Chief Executive Officer of the Company, in the case of Dr. Hedley, the President and Chief Scientific Officer of the Company, and in the case of Mr. Rodgers, the Executive Vice President and Chief Financial Officer of the Company, subject to certain exceptions; (ii) a reduction by the Company in the executive's annual base salary or target bonus percentage; (iii) the relocation of the executive's primary office at the Company's headquarters in the Boston, Massachusetts metropolitan area to another location by more than 50 miles or relocation of the executive's primary office at the Company's headquarters to another location that is not the Company's headquarters; (iv) a breach by the Company of the terms of the offer letter agreement or the executive's Restricted Stock Agreement, including, without limitation, the diminution of such executive's job title; or (v) only with regard to Mr. Moulder or Dr. Hedley, and only during such time as the Voting Agreement (as such term is defined elsewhere in this prospectus) is in effect, the Company removes the executive from the board of directors, other than for Cause, or fails to re-elect the executive to serve on the board of directors. In each case, the Company shall have 30 days to cure such circumstances in all material respects upon the receipt of notice from the executive of such circumstances. In no event shall termination for Good Reason occur after the 180th day following the first occurrence of any Good Reason event.

Non-Disclosure and Inventions Assignment Agreement

        Each of our named executive officers has also entered into a standard form agreement with respect to the non-disclosure of information and assignment of inventions. Among other things, this agreement obligates each named executive officer to refrain from disclosing any of our proprietary and confidential information received during the course of employment and to assign to us any inventions conceived or developed during the course of their employment.

Potential Payments Upon a Termination or Change in Control

        As discussed under the caption "—Offer Letter Agreements" above, we have agreements with our named executive officers pursuant to which they will receive severance payments upon certain termination events. The information below describes and quantifies certain compensation that would be available under our existing plans and arrangements if (i) the named executive officer was terminated as of December 31, 2011 or (ii) if a Change of Control or Acquisition, as the case may be and each as defined below, occurred on December 31, 2011 and the named executive officer had been subsequently terminated on the same date.

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    Acceleration of Restricted Stock and Equity Awards.

        Pursuant to the terms of each named executive officer's Restricted Stock Agreement, in the event of a "Change of Control" that occurs during any time such named executive officer's Business Relationship (as such term is defined in the Restricted Stock Agreements) with the Company or any parent corporation or subsidiary, all shares of restricted stock awards granted pursuant to such Restricted Stock Agreement shall fully vest. For purposes of these shares of restricted stock, a "Change of Control" shall mean (A) the Company merges with or into or consolidates with any other corporation or sells, leases or otherwise disposes of all or substantially all of its assets or properties, unless the stockholders of the Company, before giving effect to such merger, consolidation or sale, lease or other disposition of assets, beneficially own at least 50% of the outstanding shares of capital stock of, or other equity interests in, the surviving or acquiring corporation or entity (calculated on a fully diluted basis) or (B) any person (other than persons who were stockholders of the Company prior to such transactions or any venture capital or private equity investor making a portfolio investment), together with its associates, acquires beneficial ownership of 50% or more of the outstanding shares of the Company's common stock.

        In addition, in the event of an "Acquisition" of the Company, as defined herein, all equity awards granted under the Company's 2010 Stock Incentive Plan that are outstanding immediately prior to the Acquisition shall become fully vested and exercisable.

        Termination Other than for Cause, Death or Disability; Resignation for Good Reason.    Assuming a December 31, 2011 termination event, the aggregate value of the payment and benefits to which each named executive officer would be entitled to in the event that the named executive officer's employment is terminated for any reason other than for Cause, death, or Disability, or if the named executive officer resigns for Good Reason, would be as follows:

Name
  Cash
Severance
($)(1)
  Benefits and
Health
Programs
($)(2)
  Value of
Accelerated
Restricted
Shares
($)(3)
  Total
($)

Leon O. Moulder, Jr. 

               

Mary Lynne Hedley, Ph.D. 

               

Richard J. Rodgers

               

(1)
This amount represents one year of the executive's base salary at the rate in effect immediately prior to the executive's termination of employment.

(2)
This amount represents 12 months of continued Company-paid health coverage.

(3)
The value of the restricted stock vesting acceleration is calculated based on an assumed initial public offering price of $        per share, which is the midpoint of the price range listed on the cover page of this prospectus, with respect to unvested restricted stock subject to acceleration.

        Termination Following a Change of Control or Acquisition.    Assuming a December 31, 2011 Change of Control or Acquisition, as the case may be, and subsequent termination event on that same date for any reason other than Cause, death or disability, or if the named executive officer resigns for Good

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Reason, the aggregate value of the payment and benefits to which each named executive officer would be entitled to would be as follows:

Name
  Cash
Severance
($)(1)
  Benefits
and Health
Programs
($)(2)
  Value of
Accelerated
Restricted
Shares
($)(3)
  Value of
Accelerated
Equity
($)(4)
  Total
($)

Leon O. Moulder, Jr. 

                   

Mary Lynne Hedley, Ph.D. 

                   

Richard J. Rodgers

                   

(1)
This amount represents one year of the executive's base salary at the rate in effect immediately prior to the executive's termination of employment other than for Cause, death, or Disability, or if the named executive officer resigns for Good Reason.

(2)
This amount represents 12 months of continued Company-paid health coverage.

(3)
The value of the restricted stock vesting acceleration is calculated based on an assumed initial public offering price of $        per share, which is the midpoint of the price range listed on the cover page of this prospectus, with respect to unvested restricted stock subject to acceleration.

(4)
Assuming a December 31, 2011 Acquisition, the value of all equity awards issued pursuant to the 2010 Stock Incentive Plan that would vest and become exercisable for each named executive officer would be as follows:


Name
  Value of
Stock
Options
($)
  Value of
Restricted
Shares
($)

Leon O. Moulder, Jr. 

       

Mary Lynne Hedley, Ph.D. 

       

Richard J. Rodgers

       

        The value of stock option vesting acceleration is calculated based on an assumed initial public offering price of $        per share, which is the midpoint of the price range listed on the cover page of this prospectus, with respect to unvested option shares subject to acceleration, less the exercise price of these unvested options shares. The actual value will vary depending on the date the options are exercised. The value of the restricted stock vesting acceleration is calculated based on an assumed initial public offering price of $        per share, which is the midpoint of the price range listed on the cover page of this prospectus, with respect to unvested restricted stock subject to acceleration.

Director Compensation

        For the fiscal year ended December 31, 2011, directors received no compensation for services rendered as members of our board of directors.

Equity Benefit Plans

2012 Omnibus Incentive Plan

        Prior to the completion of this offering, our board of directors will adopt, and our stockholders are expected to approve, our 2012 Omnibus Incentive Plan, or 2012 Plan, which will become effective immediately prior to the closing of this offering, for the purpose of attracting, rewarding and retaining directors, executive officers and other key employees and service providers, including officers, employees and service providers of our subsidiaries and affiliates, and to stimulate their efforts toward

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our continued success, long-term growth and profitability. The 2012 Plan provides for the grant of stock options, stock appreciation rights, restricted stock, unrestricted stock, stock units, dividend equivalent rights, performance shares or other performance-based awards, other equity-based awards and cash bonus awards. We have reserved            shares of common stock for issuance pursuant to the 2012 Plan, subject to certain adjustments set forth in the plan. In addition, all shares of common stock available for issuance under our 2010 Stock Incentive Plan as of the completion of the offering will become available for issuance under the 2012 Plan. As of March 1, 2012, this number was 3,146,500. This summary is qualified in its entirety by the detailed provisions of the 2012 Plan, which is filed as an exhibit to the registration statement of which this prospectus is a part.

        Section 162(m) of the Code limits publicly held companies to an annual deduction for U.S. federal income tax purposes of $1,000,000 for compensation paid to each of their chief executive officer and their three highest compensated executive officers (other than the chief executive officer or the chief financial officer) determined at the end of each year, referred to as covered employees. However, performance-based compensation is excluded from this limitation. The 2012 Plan is designed to permit the compensation committee to grant awards that qualify as performance-based for purposes of satisfying the conditions of Section 162(m), but it is not required under the 2012 Plan that awards qualify for this exception. To qualify as performance-based (i) the compensation must be paid solely on account of attainment of one or more pre-established objective performance goals; (ii) the performance goal under which compensation is paid must be established by a compensation committee comprised solely of two or more directors who qualify as outside directors; (iii) the material terms under which the compensation is to be paid must be disclosed to, and subsequently approved by, stockholders before payment is made; and (iv) the compensation committee must certify in writing before payment of the compensation that the performance goals and any other material terms were in fact satisfied.

        Administration of the 2012 Plan.    The 2012 Plan will be administered by our compensation committee, and our compensation committee will determine all terms of awards under the plan. Each member of our compensation committee that administers the plan will be a "non-employee director" within the meaning of Rule 16b-3 of the Exchange Act, an "outside director" within the meaning of Section 162(m) of the Code and an "independent" director within the meaning of the Nasdaq rules. Our compensation committee will also determine who will receive awards under the plan, the type of award and its terms and conditions and the number of shares of our common stock subject to the award, if the award is equity-based. Our compensation committee will also interpret the provisions of the plan. During any period of time in which we do not have a compensation committee, the plan may be administered by our board of directors or another committee appointed by our board of directors. References below to the compensation committee include a reference to the board of directors or another committee appointed by the board of directors for those periods in which the board of directors or such other committee appointed by the board of directors is acting.

        Eligibility.    All employees and officers of the Company and our affiliates are eligible to receive awards under the 2012 Plan. In addition, our non-employee directors and consultants and advisors who perform services for us and our affiliates may receive awards under the 2012 Plan, other than incentive stock options.

        Share Authorization.    As stated above, we have reserved            shares of common stock for issuance under the 2012 Plan, in addition to 3,146,500 shares of common stock that remain available for issuance under the 2010 Stock Incentive Plan as of the completion of this offering. In connection with stock splits, dividends, recapitalizations and certain other events, our board will make proportionate adjustments that it deems appropriate in the aggregate number of shares of common stock that may be issued under the 2012 Plan and the terms of outstanding awards. In addition, the number of shares available for issuance under the 2012 Plan will be increased automatically on

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January 1 of each year, starting with 2013, by a number of shares of common stock equal to the least of:

                         shares of common stock;

           % of the shares of common stock outstanding at such time; or

    the number of shares determined by our board of directors.

The 2012 Plan will also provide for an aggregate limit of            shares of common stock that may be issued under the 2012 Plan over the course of its ten-year term. If any awards terminate, expire or are canceled, forfeited, exchanged or surrendered without having been exercised or paid or if any awards are forfeited or expire or otherwise terminate without the delivery of any shares of common stock, the shares of common stock subject to such awards will again be available for purposes of our 2012 Plan. However, the number of shares of common stock available for issuance under our 2012 Plan will not be increased by the number of shares of common stock (i) tendered or withheld or subject to an award surrendered in connection with the purchase of shares of common stock upon exercise of an option, (ii) deducted or delivered from payment of an award in connection with our tax withholding obligations, or (iii) purchased by us with the proceeds from option exercises.

        During any time that the transition period under Section 162(m) of the Code has expired, the maximum number of shares of common stock subject to options or stock appreciation rights that can be issued under the 2012 Plan to any person is            in any single calendar year; provided that the maximum number of shares of common stock subject to options or stock appreciation rights that may be granted under the 2012 Plan to any person in the year in which such person is first employed by, or first provides service to us, is            shares. The maximum number of shares of common stock that can be issued under the 2012 Plan to any person other than pursuant to an option or stock appreciation right is in any single calendar year; provided that the maximum number of shares of common stock subject to an award other than an option or stock appreciation right that may be granted under the 2012 Plan to any person in the year in which such person is first employed by, or first provides service to us, is            shares. The maximum amount that may be earned as an annual incentive award or other cash award in any calendar year by any one person is            and the maximum amount that may be earned as a performance award or other cash award in respect of a performance period by any one person is            ; provided, however, the maximum amount that may be paid as an annual incentive award or other cash award to any person in the year that the person is first employed by, or first provides other service to, us is $        , and the maximum amount that may be may be earned as a performance award or other cash award in respect of a performance period by any person eligible for an award for a performance period commencing with or immediately following the year that the person is first employed by us is $        .

        Share Usage.    Shares of common stock that are subject to awards will be counted against the 2012 Plan share limit as one share of stock for every one share of stock subject to the award. The number of shares of stock subject to any stock appreciation rights awarded under the 2012 Plan will be counted against the aggregate number of shares of stock available for issuance under the 2012 Plan regardless of the number of shares of stock actually issued to settle the stock appreciation right upon exercise.

        No Repricing.    Except in connection with certain corporate transactions, no amendment or modification may be made to an outstanding stock option or stock appreciation right, including by replacement with or substitution of another award type, that would reduce the exercise price of the stock option or stock appreciation right or would replace any stock option or stock appreciation right with an exercise price above the current market price with cash or another security, in each case without the approval of our stockholders (although appropriate adjustments may be made to outstanding stock options and stock appreciation rights to achieve compliance with applicable law, including the Code).

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        Options.    The 2012 Plan authorizes our compensation committee to grant incentive stock options (under Section 421 of the Code) and options that do not qualify as incentive stock options, or nonstatutory stock options. The exercise price of each option will be determined by the compensation committee, provided that the price will be equal to at least the fair market value of the shares of common stock on the date on which the option is granted. If we were to grant incentive stock options to any 10% stockholder, the exercise price may not be less than 110% of the fair market value of our shares of common stock on the date of grant.

        The term of an option cannot exceed 10 years from the date of grant. If we were to grant incentive stock options to any 10% stockholder, the term cannot exceed five years from the date of grant. The compensation committee determines at what time or times each option may be exercised and the period of time, if any, after retirement, death, disability or termination of employment during which options may be exercised. Options may be made exercisable in installments. The exercisability of options may be accelerated by the compensation committee.

        The aggregate fair market value, determined at the time of grant, of our common stock with respect to incentive stock options that are exercisable for the first time by an optionee during any calendar year under all of our stock plans may not exceed $100,000. Options or portions thereof that exceed such limit will generally be treated as nonstatutory stock options.

        The exercise price for any option or the purchase price for shares of restricted stock is generally payable (1) in cash or cash equivalents, (2) to the extent the award agreement provides, by the surrender of shares of common stock (or attestation of ownership of such shares) with an aggregate fair market value on the date on which the option is exercised, of the exercise or purchase price, (3) with respect to an option only, to the extent the award agreement provides, by payment through a broker in accordance with procedures established by us or (4), to the extent the award agreement provides and/or unless otherwise specified in an award agreement, any other form permissible by applicable laws, including net exercise and service to us.

        Stock Appreciation Rights.    The 2012 Plan authorizes our compensation committee to grant stock appreciation rights that provide the recipient with the right to receive, upon exercise of the stock appreciation right, cash, shares of common stock or a combination of the two. The amount that the recipient will receive upon exercise of the stock appreciation right will equal the excess of the fair market value of our common stock on the date of exercise over the shares' fair market value on the date of grant. Stock appreciation rights will become exercisable in accordance with terms determined by our compensation committee. Stock appreciation rights may be granted in tandem with an option grant or independently from an option grant. The term of a stock appreciation right cannot exceed 10 years from the date of grant.

        Stock Awards.    The 2012 Plan also provides for the grant of stock awards (which includes restricted stock and stock units). A stock award is an award of shares of common stock that may be subject to restrictions on transferability and other restrictions as our compensation committee determines in its sole discretion on the date of grant. The restrictions, if any, may lapse over a specified period of time or through the satisfaction of conditions, in installments or otherwise, as our compensation committee may determine. A participant who receives a stock award will have all of the rights of a stockholder as to those shares, including, without limitation, the right to vote and the right to receive dividends or distributions on the shares, except that the board of directors may require any dividends to be reinvested in shares. During the period, if any, when share awards are non-transferable or forfeitable, a participant is prohibited from selling, transferring, assigning, pledging or otherwise encumbering or disposing of his or her award shares.

        Stock Units.    The 2012 Plan also authorizes our compensation committee to grant stock units. Stock units represent the participant's right to receive, upon payments by us of a cash dividend on our outstanding stock, a cash payment for each stock unit held, equal to the per stock dividend paid on such outstanding stock. A holder of stock units will not have rights as a stockholder.

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        Dividend Equivalents.    Our compensation committee may grant dividend equivalents in connection with the grant of any equity-based award (other than stock options or stock appreciation rights). Dividend equivalents may be paid currently or may be deemed to be reinvested in additional shares of stock, which may thereafter accrue additional equivalents, and may be payable in cash, shares of common stock or a combination of the two. Our compensation committee will determine the terms of any dividend equivalents.

        Performance Awards.    The 2012 Plan permits the grant of performance-based stock and cash awards that may qualify as performance-based compensation not subject to the $1,000,000 limitation on the income tax deductibility of compensation paid to a covered executive officer imposed by Section 162(m) of the Code. Performance-based awards are awards of options, stock appreciation rights, restricted stock, stock units, other equity-based awards or cash that are made subject to the achievement of performance goals over a performance period specified by our compensation committee. Our compensation committee will determine the applicable performance period, the performance goals and such other conditions that apply to the performance-based award. Performance goals may relate to our financial, the participant's performance or such other criteria determined by our compensation committee.

        The performance goals that may be selected include one or more of the following: net earnings or net income; operating earnings; pretax earnings; earnings per share of stock; share price, including growth measures and total stockholder return; earnings before interest and taxes; earnings before interest, taxes, depreciation and/or amortization, on an adjusted or unadjusted basis; sales or revenue growth, whether in general, by type of product or service, or by type of customer; gross or operating margins; return measures, including return on assets, capital, investment, equity, sales or revenue; cash flow, including operating cash flow, free cash flow, levered cash flow, cash flow return on equity and cash flow return on investment; productivity ratios; expense targets; market share; financial ratios as provided in credit agreements of the Company and its subsidiaries; working capital targets; completion of in-licenses or acquisitions of products, technologies, businesses or companies; completion of divestitures and assets sales; results of preclinical testing; results of preclinical or clinical trial; submitting regulatory filings; regulatory approvals; entering into contractual arrangements; meeting contractual requirements; achieving contractual milestones; entering into collaborations; regulatory body approval for commercialization of a product; implementation or completion of critical projects; segment share; product development; research; licensing; manufacturing; manufacturing capacity; production; inventory; production volume levels; market penetration; agency ratings; and any combination of any foregoing criteria.

        The performance goals may be based on a Company-wide basis, with respect to one or more business units, divisions, affiliates or business segments, and in either absolute terms or relative to the performance of one or more comparable companies or the performance of one or more relevant indices. Awards that are intended to qualify as performance-based compensation may not be adjusted upward. The plan administrator shall retain the discretion to adjust performance-based awards downward, either on a formula or discretionary basis, or any combination as the compensation committee determines. The performance goals may differ from participant to participant and from award to award.

        Other Equity-Based Awards.    Our compensation committee may grant other types of equity-based awards under the 2012 Plan. Other equity-based awards are payable in cash, shares of common stock or other equity, or a combination thereof, and may be restricted or unrestricted, as determined by our compensation committee. The terms and conditions that apply to other equity-based awards are determined by the compensation committee.

        Recoupment.    Award agreements for awards granted pursuant to the 2012 Plan may be subject to mandatory repayment by the recipient to us of any gain realized by the recipient to the extent the recipient is in violation of or in conflict with certain agreements with us (including but not limited to

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an employment or non-competition agreement) or upon termination for "cause" as defined in the 2012 Plan, applicable award agreement, or any other agreement between us and the grantee. Awards are also subject to mandatory repayment to the extent the grantee is or becomes subject to any clawback or recoupment right we may have or to the extent any law, rule or regulation imposes mandatory recoupment.

        Change in Control.    If we experience a change in control                                    .

        Amendment; Termination.    Our board of directors may amend or terminate the 2012 Plan at any time; provided that no amendment may adversely impair the benefits of participants with outstanding awards. Our stockholders must approve any amendment if such approval is required under applicable law or NASDAQ regulations. Our stockholders also must approve any amendment that changes the no re-pricing provisions of the plan. Unless terminated sooner by our board of directors or extended with stockholder approval, the 2012 Plan will terminate on the tenth anniversary of the adoption of the plan.

2010 Stock Incentive Plan

        General.    In March 2010, our board of directors and stockholders adopted the 2010 Stock Incentive Plan, or the 2010 Plan. The 2010 Plan was amended on June 6, 2011. The 2010 Plan is administered by our compensation committee, except with respect to matters related to the Chief Executive Officer's equity awards, which are determined by the board of directors. The administrator has the authority to determine the terms and conditions of the awards granted under the 2010 Plan. Our administrator has determined not to grant any additional awards under the 2010 Plan after the completion of this offering. However, the 2010 Plan will continue to govern the terms and conditions of the outstanding awards granted under the 2010 Plan which, as of the date of this prospectus, constitute all of our outstanding stock options and restricted stock awards.

        Share Reserve.    As of March 1, 2012, a total of 6,934,000 shares of our common stock had been authorized for issuance under the 2010 Plan. As of December 31, 2011, options to purchase a total of 3,127,500 shares of our common stock were issued and outstanding, a total of 660,000 shares of common stock had been issued under the 2010 Plan and 3,146,500 shares remained available for future grants. Such remaining share balance will become available for issuance under the 2012 Plan immediately prior to the closing of this offering.

        Types of Awards.    The 2010 Plan provides for the grant of nonstatutory stock options, restricted stock, restricted stock units and other stock-based interests to our employees, officers, directors, consultants and advisors. Our 2010 Plan provides for the grant of incentive stock options, within the meaning of Section 422 of the Code, to employees of such company or a "parent corporation" or "subsidiary corporation" thereof (as such terms are defined in Section 424(e) and (f) of the Code).

        Corporate Transactions.    The 2010 Plan provides that upon the consummation of an "Acquisition" of the Company, our board of directors, or the board of directors of the surviving or acquiring entity, shall, as to the outstanding equity awards under the 2010 Plan, either (i) continue, assume or substitute on an equitable basis for each outstanding award, (ii) provide written notice that such awards must be exercised within a given period or (iii) terminate such awards in exchange for a cash payment equal to the excess of fair market value for the vested shares subject to such awards over the exercise price. Notwithstanding the prior sentence, in the event of an Acquisition, vesting of any awards issued pursuant to the 2010 Plan will accelerate in full prior to the consummation of the transaction but with payment deferred until six months following the transaction. For purposes of the 2010 Plan, an "Acquisition" shall mean: (x) the sale of the Company by merger or consolidation after giving effect to which the stockholders of the Company immediately prior to such event shall, immediately following such event, hold less than a majority of the voting power of the outstanding equity securities of the Company (or its successor); (y) any sale, lease, exchange or other disposition of all or substantially all

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of the assets or capital stock of the Company (other than in a spin-off or similar transaction) or (z) any other acquisition of the business of the Company, as determined by the board of directors.

        Repricing of Options.    The board of directors may, without stockholder approval, (i) amend any outstanding option to reduce the exercise price of such option, or (ii) cancel any outstanding option and grant a substitution of new options covering the same or a different number of shares and having a lower exercise price than the cancelled option.

        Transfer.    The 2010 Plan does not allow for the transfer of awards other than by will or the laws of descent and distribution and only the recipient of an award may exercise such an award during his or her lifetime, or, in the case of a nonstatutory stock option, pursuant to a qualified domestic relations order.

        Suspension; Amendment; Termination.    Our board of directors may amend, suspend or terminate the Plan or any portion thereof at any time. Unless terminated sooner by our board of directors or extended with stockholder approval, the 2010 Plan will terminate on March 26, 2020. No awards may be granted under our 2010 Plan while the 2010 Plan is suspended or after it is terminated.

2012 Employee Stock Purchase Plan

        In              , 2012, we adopted a new employee stock purchase plan, or ESPP, which will be effective as of the closing of this offering, that will provide our employees, including our named executive officers, and employees of any subsidiary of the Company with an opportunity to purchase or common stock at a discount on a tax-qualified basis through payroll deductions following the effective date of this registration statement. The purpose of the ESPP is to encourage stock ownership in the Company by employees of the Company and its subsidiaries, thereby enhancing employee interest in the continued success and progress of the Company. The ESPP will be designed to qualify as an "employee stock ESPP" under Section 423 of the Code. A summary of the provision of the ESPP is set forth below and is qualified in its entirety by the detailed provisions of the ESPP, which is filed as an exhibit to the registration statement of which this prospectus is a part.

        The aggregate number of shares of common stock available for purchase by eligible employees of the Company or any of its subsidiaries pursuant to the terms of the ESPP is                 . The shares of common stock issuable under the ESPP may be authorized but unissued shares, treasury shares, or shares purchased on the open market.

        The ESPP permits eligible employees to elect to have a portion of their pay deducted by the company or to make periodic cash payments, if authorized by the compensation committee, to purchase shares of our common stock. In the event there is any increase or decrease in common stock without receipt of consideration by the company (for instance, by a recapitalization or stock split), there shall be a proportionate adjustment to the number and kinds of shares that may be purchased under the ESPP. We will determine the length and duration of the periods during which payroll deductions or other cash payments will be accumulated to purchase shares of common stock. This period is known as the offering period. The first offering period is expected to begin                              , 2012.

        Administration.    The compensation committee shall administer the ESPP. The compensation committee has board powers to administer and interpret the ESPP.

        Eligibility.    The ESPP permits employees to purchase common stock on the open market through a third party administrator at a price not greater than fair market value, and for certain offering periods at a discounted price up to the Maximum Discounted Price (as defined below). The ESPP also confers possible favorable tax consequences to the participants who make discounted purchases. All of the employees of the Company and its subsidiaries designated by the board of directors who have been employed by the Company or one of its designated subsidiaries to work at least 20 hours per week are eligible to participate in any of the offering periods of the ESPP. A participant must be employed on

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the last day of an offering period in order to acquire stock under the ESPP, unless the participant has retired, died, become disabled, been laid off, discharged without cause or is on an approved leave of absence. A participant will not be granted an option to purchase under the ESPP if, after exercising his or her right to purchase shares under the ESPP, that person would own stock or outstanding options possessing 5% or more of the total combined voting power of all classes of Company stock. There are currently no participants in the ESPP.

        Participation and Exercise of Right.    Under the ESPP, eligible employees may elect to participate in the ESPP prior to the first day of any offering period. Payroll deductions shall commence on the first pay date of the offering period. Once an eligible employee elects to participate, the employee will continue to be a participant for subsequent offering periods, unless the employee elects not to participate. The offering periods are expected to be          month periods. However, the compensation committee can change the duration and frequency of the offering periods without stockholder approval.

        On the first day of each offering period, each participant will receive an option to purchase up to a specified number of shares of stock on the last business day on or before the end of the offering period, which is referred to as the exercise date. Upon enrollment in the ESPP, the participant will authorize a payroll deduction, on an after-tax basis, in an amount of not more than 10% of the participant's base pay on each payroll date. A participant may not during any offering period increase his or her percentage of payroll deduction or contribution for that offering period, nor may a participant withdraw any contributed funds other than by terminating participation in the ESPP. A participating employee may decrease his or her rate of contribution once during a purchase period (but not below $10.00 per pay period), or may increase or decrease his or her rate of contribution to take effect on the first day of the next offering period, by delivering to the Company a new form regarding election to participate in the ESPP. A participating employee may terminate payroll deductions or contributions at any time.

        Unless the participant withdraws from the ESPP before the end of an offering period, the participant's option for the purchase of shares will be exercised automatically on each exercise date, and the participant's accumulated payroll deductions will be used to purchase the maximum number of full shares available under the right. Shares will be purchased on the open market. The purchase price for the shares will come from the accumulated payroll deductions credited to the participant's account under the ESPP. The Company will refund any excess payroll deduction amounts to the participant. The Company will not pay any interest on funds withheld, and the Company will use these funds for general operating purposes. The withheld amounts will not be held in a trust or other account separate from the Company's other funds.

        Option Purchase Periods.    The Company may, but is not required to, permit periodic purchases of stock within a single offering period. The periods during which payroll deductions are accumulated for these purchases are referred to as purchase periods.

        Delivery.    On the purchase date, a participating employee will be credited with the number of whole shares of common stock purchased under the ESPP for such period. Common stock purchased under the ESPP will be held in the custody of an agent designated by the company. The agent may hold the common stock purchased under the ESPP in stock certificates in nominee names and may commingle shares held in its custody in a single account or stock certificate, without identification as to individual employees. Subject to any additional restrictions imposed by the compensation committee in its discretion, a participant may, at any time following his or her purchase of shares under the ESPP, by written notice instruct the agent to have all or part of such shares reissued in the participant's own name and have the stock certificate delivered to the employee. The compensation committee may also elect to impose a holding period requirement of up to two years from the purchase date for shares of common stock purchased by participating employees under the ESPP.

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        If in any purchase period the number of unsold shares that may be made available for purchase under the ESPP is insufficient to permit eligible employees to exercise their rights to purchase shares, a participation adjustment will be made, and the number of shares purchasable by all participating employees will be reduced proportionately. Any funds then remaining in a participating employee's account after such exercise will be refunded to the employee.

        Maximum Purchase.    The maximum number of shares that can be purchased during each offering period by a participant is            shares, subject to change by the compensation committee.

        Pricing and Annual Limit.    The price per share of the shares offered in a given offering period is determined by the compensation committee, provided that the price is no greater than the fair market value of the share on the date of purchase and no less than the "Maximum Discounted Price" as follows:

    85% of the fair market value of a share of the common stock on the first business day of the offering period; or, if lower,

    85% of the fair market value of a share of the common stock on the last day of the offering period.

        In no event may the purchase price be less than the par value of the common stock. As required by the Code, no participant may receive a right under the ESPP for shares that have a fair market value in excess of $25,000 for any calendar year in which the right is outstanding, determined at the time the participant receives the right. The compensation committee may also, prior to the start of an offering period, impose an additional limitation on the number or value of shares of common stock an employee may purchase during an offering period.

        Termination of Participation.    A participating employee will be refunded all monies in his or her account, and his or her participation in the ESPP will be terminated, if: (i) the participant ceases to be eligible to participate in the ESPP, or (ii) the participant either voluntarily leaves the employ of the Company or a participating affiliate, other than by retirement, or is discharged for cause prior to the purchase date. A participating employee's participation in the ESPP will also terminate in the event that the board of directors elects to terminate the plan; provided that termination of the plan will not impair the vested rights of the participant.

        If a participating employee elects to terminate participation in the ESPP, terminates participation because of his or her retirement or death, or terminates participation because of an involuntary termination of employment without cause, the participant (or his or her representative in the event of death) can choose to either: (i) purchase common stock on the purchase date with the amounts then accumulated in his or her account or (ii) have all monies in his or her account refunded.

        Lay-off, Authorized Leave of Absence or Disability.    Payroll deductions may be suspended for a participating employee during any period of absence of the participant from work due to lay-off, authorized leave of absence or disability or, if the participant so elects, periodic payments to the ESPP by the participant may continue to be made in cash. If the participating employee returns to active service prior to the purchase date, the participant's payroll deductions will be resumed. If the participant did not make periodic cash payments during the participant's period of absence, the participant may elect to either: (i) make up any deficiency in the participant's account resulting from a suspension of payroll deductions by an immediate cash payment; (ii) not to make up the deficiency in his or her account, in which event the number of shares to be purchased by the participant will be reduced to the number of whole shares which may be purchased with the amount, if any, credited to the participant's account on the purchase date; or (iii) withdraw the amount in the participant's account and terminate the participant's option to purchase. If a participating employee's period of lay-off, authorized leave of absence or disability terminates on or before the purchase date, and the participant

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has not resumed active employment with the Company or a participating affiliate, the participant will receive a distribution of his or her account.

        Transferability of Shares.    No participating employee may assign his or her rights to purchase shares of common stock under the ESPP, whether voluntarily, by operation of law or otherwise. Any payment of cash or issuance of shares of common stock under the ESPP may be made only to the participating employee (or, in the event of the participant's death, to the participant's estate).

        Termination of ESPP; Reorganizations.    The board of directors or committee will determine when to end the ESPP, provided that such termination shall not impair any rights of participants that have vested at the time of termination. In any event, the ESPP will terminate without further action of the board of directors at the earlier of (i)                         , 2022 and (ii) such time as all shares of common stock that may be available for purchase under the ESPP have been issued.

        Under circumstances of dissolution or liquidation of the Company the offering period will terminate. Upon a merger of the Company with or into another company or upon a sale of all or substantially all of the Company's assets, the ESPP will be terminated, unless the board of directors determines for the continuation of the ESPP and the assumption of the options outstanding under it will be assumed or an equivalent option will be substituted by the successor corporation. In the event of a termination of the ESPP, the last day of an offering that is in progress will be deemed to be the last trading day before the termination and the outstanding options of participating employees will be deemed to be automatically exercised that day.

        Effect of Certain Corporate Transactions.    The ESPP provides for adjustment of the number of shares for which options may be granted, the number of shares subject to outstanding options and the exercise price of outstanding options in the event of any increase or decrease in the number of issued and outstanding shares of common stock as a result of one or more recapitalizations, reclassifications, stock splits, combinations of shares, exchanges of shares, stock dividends, or other distribution payable in capital stock, or other increase or decrease in shares.

        Amendment.    The board of directors may amend the ESPP at any time, provided that no amendment may change any option previously granted in a way that adversely affects the rights of the holder of the option and, without stockholder approval, the board of directors may not increase the maximum number of shares available for purchase under the ESPP or changing the eligibility requirements for participating in the ESPP.

        No Employment Rights.    Neither the ESPP nor any right to purchase common stock under the ESPP confers upon any participant any right to continued employment with the Company or a participating affiliate.

        Other Rights.    Company stockholders will not have any preemptive rights to purchase or subscribe for the shares reserved for issuance under the ESPP.

401(k) Retirement Plan

        We maintain a defined contribution employee retirement plan for our employees. Our 401(k) plan is intended to qualify as a tax-qualified plan under Section 401 of the Code so that contributions to our 401(k) plan, and income earned on such contributions, are not taxable to participants until withdrawn or distributed from the 401(k) plan. Our 401(k) plan provides that each participant may contribute up to 100% of his or her pre-tax compensation, up to a statutory limit of $17,000 for 2012. Participants who are at least 50 years old can also make "catch-up" contributions, which in 2012 may be up to an additional $5,500 above the statutory limit. Under our 401(k) plan, each employee is fully vested in his or her deferred salary contributions. Employee contributions are held and invested by the plan's trustee. Our 401(k) plan also permits us to make discretionary and matching contributions, subject to certain limits. Effective as of January 1, 2012, we amended our 401(k) plan to provide for employer matching contributions equal to (1) 100% of employee deferral contributions up to a deferral rate of 3% compensation plus (2) 50% of employee deferral contributions up to a deferral rate of an additional 2% compensation.

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CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS

        The following is a description of transactions, since our formation in March 2010, to which we have been a party, in which the amount involved exceeded or will exceed $120,000, and in which any of our executive officers, directors or holders of more than 5% of any class of our voting securities, or an affiliate or immediate family member thereof, had or will have a direct or indirect material interest, other than compensation, termination and change in control arrangements, which are described under "Executive and Director Compensation." We believe the terms obtained or consideration that we paid or received, as applicable, in connection with the transactions described below were comparable to terms available or the amounts that would be paid or received, as applicable, in arm's-length transactions with unrelated third parties.

Preferred Stock Issuances

Issuance of Series A-1 and A-2 Preferred Stock

        In May 2010 and February 2011, we issued and sold an aggregate of 20,000,000 shares of our Series A preferred stock, in two tranches, Series A-1 preferred stock and Series A-2 preferred stock, at a price per share of $1.00, for aggregate consideration of $20 million. In connection with the sale of Series A preferred stock, we paid approximately $25,000 in legal fees for the benefit of the entities affiliated with New Enterprise Associates.

        The table below sets forth the number of shares of Series A-1 and A-2 preferred stock purchased by our executive officers, directors and stockholders who held more than 5% of any class of our voting securities and their affiliates. Each share of preferred stock in the table below will convert into one share of our common stock immediately prior to the closing of this offering.

 
  Series A-1
Preferred
Stock
(#)
  Aggregate
Purchase Price
of Series A-1
Preferred Stock
($)
  Series A-2
Preferred
Stock
(#)
  Aggregate
Purchase
Price of
Series A-2
Preferred
Stock
($)
 

Stockholders

                         

Entities affiliated with New Enterprise Associates(1)

    8,000,000     8,000,000     9,995,000     9,995,000  

Directors and Executives Officers

                         

Leon O. Moulder, Jr. 

    1,500,000     1,500,000          

Mary Lynne Hedley, Ph.D. 

    250,000     250,000          

Richard J. Rodgers

    250,000     250,000          

(1)
David M. Mott and Paul Walker, each of whom is one of our directors, are a general partner and partner, respectively, of New Enterprise Associates.

Issuance of Series B Preferred Stock

        In June 2011, July 2011 and March 2012, we issued and sold an aggregate of 46,436,761 shares of our Series B preferred stock at a price per share of $2.175, for aggregate consideration of approximately $101 million. In connection with the sale of the Series B preferred stock, we paid approximately $220,000 in legal fees for the benefit of the investors, including the stockholders identified in the table below.

        The table below sets forth the number of shares of Series B preferred stock purchased by our stockholders who held more than 5% of any class of our voting securities or their affiliates in June 2011 and March 2012. No shares were purchased by these stockholders and their affiliates in July 2011.

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Each share of preferred stock in the table below will convert into one share of our common stock immediately prior to the closing of this offering.

 
  June 2011
Purchase of
Series B
Preferred
Stock
(#)
  Aggregate
Purchase Price
of June 2011
Purchase of
Series B
Preferred Stock
($)
  March 2012
Purchase of
Series B
Preferred
Stock
(#)
  Aggregate
Purchase
Price of
March 2012
Purchase of
Series B
Preferred
Stock
($)
 

Stockholders

                         

Entities affiliated with New Enterprise Associates(1)

    7,741,199     16,837,108     10,647,306     23,157,892  

Entity affiliated with InterWest Partners(2)

    3,871,748     8,421,052     5,323,654     11,578,948  

Entities affiliated with Kleiner Perkins Caufield & Byers(3)

    2,903,811     6,315,789     3,992,740     8,684,211  

(1)
David M. Mott and Paul Walker, each of whom is one of our directors, are a general partner and partner, respectively, of New Enterprise Associates.

(2)
Arnold L. Oronsky, Ph.D., one of our directors, is a general partner of InterWest Partners.

(3)
Shares are held for convenience in the name of "KPCB Holdings, Inc., as nominee." Beth Seidenberg, M.D., one of our directors, is a partner of Kleiner Perkins Caufield & Byers.

Restricted Stock Agreements

        Each of our named executive officers purchased shares of our common stock subject to restricted stock agreements, effective as of March 26, 2010, between the named executive officers and us. Pursuant to these agreements, Mr. Moulder, Dr. Hedley and Mr. Rodgers purchased 1,750,000, 1,500,000 and 500,000 shares of restricted stock, respectively, at a purchase price of $0.0001 per share. Until such time as the shares vest (as described below), the shares are subject to repurchase by us following the termination of the named executive officer's Business Relationship (as such term is defined in the restricted stock agreements) with us at a purchase price equal to the purchase price per share. The restricted stock was 25% vested as of March 26, 2010, and 1/48th of the remaining shares of stock vest on each monthly anniversary thereafter, subject to acceleration of vesting upon termination of employment and or in specified circumstances in connection with certain change of control transactions. The agreements also impose restrictions on the transfer of the restricted stock.

Second Amended and Restated Voting Agreement

        We have entered into a voting agreement with certain holders of our common stock and the holders of our preferred stock, including our named executive officers and entities with which certain of our directors are affiliated, with respect to the election of our directors and certain other matters. All of our current directors were elected pursuant to the terms of this agreement. The voting agreement will terminate upon the closing of this offering. For more information, see "Management—Voting Arrangements."

Second Amended and Restated Right of First Refusal and Co-Sale Agreement

        We have entered into a right of first refusal and co-sale agreement with holders of our common stock and preferred stock, including our named executive officers and entities with which certain of our directors are affiliated. This agreement provides the holders of preferred stock a right of purchase and

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of co-sale in respect of sales of securities by certain holders of our common stock and Series O preferred stock. These rights of purchase and co-sale will terminate upon the closing of this offering.

Second Amended and Restated Investors' Rights Agreement

        We are party to an investors' rights agreement with the holders of our outstanding preferred stock, including our named executive officers and entities with which certain of our directors are affiliated, which provides that the holders of common stock issuable upon conversion of our preferred stock have the right to demand that we file a registration statement or request that their shares of common stock be covered by a registration statement that we are otherwise filing. With respect to this offering, the registration rights have been validly waived. In addition to the registration rights, the investors' rights agreement provides for certain information rights, board observer rights and rights of first refusal. The provisions of the investors' rights agreement, other than those relating to registration rights, will terminate upon completion of this offering. For more information regarding this agreement, see "Description of Capital Stock—Registration Rights."

Management Rights

        In connection with our sale of our preferred stock to investors, we are party to management rights letters with certain purchasers of our preferred stock, including entities affiliated with New Enterprise Associates, Kleiner Perkins Caufield & Byers and InterWest Partners, pursuant to which such entities were granted certain management rights, including the right to consult with our management on significant business issues, review our operating plans, examine our books and records and inspect our facilities. These management rights will terminate upon the completion of this offering.

Indemnification Agreements

        We have entered into indemnification agreements with each of our directors and named executive officers. For more information regarding these agreements, see "Management—Limitation on Liability and Indemnification of Officers and Directors."

Policies and Procedures Regarding Transactions with Related Persons

        Our board of directors has adopted a written related person transaction policy that will be in effect upon the closing of this offering. Accordingly, following this offering, all future related person transactions will be reviewed and approved by our audit committee (or any other committee of the board of directors consisting of independent directors) or our full board of directors. This review will cover any material transaction, arrangement or relationship, or any series of similar transactions, arrangements or relationships, in which we were or are to be a participant, the amount involved exceeds $120,000, and a related person had or will have a direct or indirect material interest, including, but not limited to, purchases of goods or services by or from a related person or entities in which the related person has a material interest, and indebtedness, guarantees of indebtedness and employment by us of a related person. A "related person," as determined since the beginning of our last fiscal year, is any executive officer, director or nominee to become director, a holder of more than 5% of our common stock, including any immediate family members of such persons or any entity which is owned or controlled by such a person.

        All of the transactions described above were entered into prior to the adoption of this policy and were approved by our board of directors.

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PRINCIPAL STOCKHOLDERS

        The following table and accompanying footnotes set forth certain information regarding the beneficial ownership of our common stock as of March 1, 2012 and as adjusted to reflect the sale of shares of common stock in this offering and the conversion of all outstanding shares of our preferred stock by:

    each of our named executive officers;

    each of our directors;

    all of our executive officers and directors as a group; and

    each person, or group of affiliated persons, known by us to be the beneficial owners of more than 5% of any class of our voting securities.

        We have based our calculation of beneficial ownership prior to the offering on 4,410,000 shares of common stock outstanding on March 1, 2012, which assumes (1) the issuance of 26,884,442 shares of our Series B preferred stock on March 21, 2012 and (2) the automatic conversion of all outstanding shares of preferred stock into an aggregate of 67,936,761 shares of common stock immediately prior to the closing of this offering. We have based our calculation of beneficial ownership after the offering on                    shares of our common stock outstanding immediately following the completion of this offering, which gives effect to the issuance of                    shares of common stock in this offering and the automatic conversion of all outstanding shares of our preferred stock into an aggregate of 67,936,761 shares of common stock immediately prior to the closing of this offering. Ownership information assumes no exercise of the underwriters' over-allotment option.

        Information with respect to beneficial ownership has been furnished to us by each director, executive officer or stockholders who held more than 5% of any class of our voting securities, as the case may be. Beneficial ownership is determined according to the rules of the SEC and generally means that a person has beneficial ownership of a security if he or she possesses sole or shared voting or investment power of that security, and includes options that are currently exercisable within 60 days of March 1, 2012. Options to purchase shares of our common stock that are exercisable within 60 days of March 1, 2012, are deemed to be beneficially owned by the persons holding these options for the purpose of computing percentage ownership of that person, but are not treated as outstanding for the purpose of computing any other persons' ownership percentage. Except as indicated in the footnotes below, each of the beneficial owners named in the table below has, and upon the closing of this offering will have, to our knowledge, sole voting and investment power with respect to all shares of common stock listed as beneficially owned by them. Unless otherwise indicated, the address for each of

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the stockholders in the table below is c/o TESARO, Inc., 1000 Winter Street, Suite 3300, Waltham, Massachusetts 02451.

 
   
  Percentage of Shares
Beneficially Owned
 
 
  Number of
Shares
Beneficially
Owned
 
Name of Beneficial Owner
  Prior to
this
Offering
  After this
Offering
 

Directors and Executive Officers

                   

Leon O. Moulder, Jr.(1)

    3,487,500     4.8 %      

Mary Lynne Hedley, Ph.D.(2)

    1,972,500     2.7 %      

Richard J. Rodgers(3)

    900,000     1.2 %      

David M. Mott(4)

    36,383,505     50.3 %      

Lawrence M. Alleva

               

Arnold L. Oronsky, Ph.D.(5)

    9,195,402     12.7 %      

Beth Seidenberg, M.D.(6)

    6,896,551     9.5 %      

Paul Walker(7)

               

All executive officers and directors as a group (8 persons)

    58,835,458     81.3 %      

Other 5% Stockholders

                   

Entities affiliated with New Enterprise Associates(4)

    36,383,505     50.3 %      

Entity affiliated with InterWest Partners(5)

    9,195,402     12.7 %      

Entities affiliated with Kleiner Perkins Caufield & Byers(6)

    6,896,551     9.5 %      

*
Represents beneficial ownership of less than one percent of our outstanding common stock.

(1)
Includes 1,987,500 shares of restricted stock, of which 64,583 shares will vest within 60 days of March 1, 2012.

(2)
Includes 1,722,500 shares of restricted stock, of which 56,146 shares will vest within 60 days of March 1, 2012.

(3)
Includes 650,000 shares of restricted stock, of which 21,875 shares will vest within 60 days of March 1, 2012.

(4)
Includes (i) 25,711,199 shares of common stock held of record by New Enterprise Associates 13, L.P. ("NEA 13"); and (ii) 25,000 shares of common stock held of record by NEA Ventures 2010, L.P. ("Ven 2010"). The shares directly held by NEA 13 are indirectly held by NEA Partners 13, L.P. ("NEA Partners 13"), the sole general partner of NEA 13, NEA 13 GP, LTD ("NEA 13 LTD"), the sole general partner of NEA Partners 13 and each of the individual Directors of NEA 13 GP, LTD. The individual directors of NEA 13 LTD (collectively, the "NEA 13 Directors") are M. James Barrett, Peter J. Barris, Forest Baskett, Ryan D. Drant, Patrick J. Kerins, Krishna "Kittu" Kolluri, C. Richard Kramlich, David M. Mott (a member of our board of directors), Scott D. Sandell, Ravi Viswanathan and Harry R. Weller. NEA 13, NEA Partners 13 and NEA 13 LTD and the NEA 13 Directors share voting and dispositive power with regard to the Company's securities directly held by NEA 13. The shares directly held by Ven 2010 are indirectly held by Karen P. Welsh, the general partner of Ven 2010. Karen P. Welsh, the general partner of Ven 2010, holds voting and dispositive power over the shares held by Ven 2010. The principal business address for New Enterprise Associates is 1954 Greenspring Drive, Suite 600, Timonium, Maryland 21093.


Mr. Mott, a general partner at New Enterprise Associates, disclaims beneficial ownership of all of the above referenced shares except to the extent of his pecuniary interest therein, if any. Paul Walker, a partner at New Enterprise Associates, has no voting or dispositive power with regard to any of the above referenced shares and disclaims beneficial ownership of such shares except to the

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    extent of his pecuniary interest therein, if any. All indirect holders of the above referenced shares disclaim beneficial ownership of all applicable shares except to the extent of their pecuniary interest therein, if any.

(5)
The shares are owned by InterWest Partners X, LP ("IW10"). InterWest Management Partners X, LLC ("IMP10") is the general partner of IW10 and has sole voting and dispositive power over the shares owned by IW10. Harvey B. Cash, Bruce A. Cleveland, Christopher B. Ehrlich, Philip T. Gianos, W. Stephen Holmes, Nina S. Kjellson, Gilbert H. Kliman, Arnold L. Oronsky, Douglas A. Pepper and Thomas L. Rosch are managing directors of IMP10. Keval Desai and Khaled A. Nasr are venture members of IMP10. Each managing director and venture member of IMP10 shares voting and dispositive power over the shares and disclaims beneficial ownership of such shares, except to the extent of his or her pecuniary interest therein. The address for IW10 and IMP10 is 2710 Sand Hill Road, Suite 200, Menlo Park, California 94025.

(6)
Includes 6,358,620 shares held by Kleiner Perkins Caufield & Byers XIV, LLC ("KPCB XIV") and 537,931 shares held by KPCB XIV Founders Fund, LLC ("KPCB XIV Founders"), all such shares are held for convenience in the name of "KPCB Holdings, Inc., as nominee." KPCB Holdings, Inc. has no voting, dispositive or pecuniary interest in any such shares. The managing member of KPCB XIV and KPCB XIV Founders is KPCB XIV Associates, LLC ("KPCB XIV Associates"). Brook Byers, L. John Doerr, Raymond Lane, Theodore Schlein, William Joy, Wiliam B. Gordon, the managing members, and Dr. Seidenberg, a member, of KPCB XIV Associates, exercise shared voting and dispositive control over the shares directly held by KPCB XIV and KPCB XIV Founders. Dr. Seidenberg disclaims beneficial ownership of all shares held by KPCB XIV and KPCB XIV Founders except to the extent of her pecuniary interest therein. The address for all entities and individuals affiliated with Kleiner Perkins Caufield & Byers is 2750 Sand Hill Road, Menlo Park, California 94025.

(7)
Mr. Walker is a partner of New Enterprise Associates. The address for Mr. Walker is c/o New Enterprise Associates, 1954 Greenspring Drive, Suite 600, Timonium, Maryland 21093. See note 4 above.

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DESCRIPTION OF CAPITAL STOCK

        Upon the closing of this offering, our amended and restated certificate of incorporation will authorize us to issue up to             total shares, including            shares of common stock, par value $0.0001 per share and            shares of preferred stock, par value $0.0001 per share. A description of the material terms and provisions of our fourth amended and restated certificate of incorporation and amended and amended and restated bylaws that will be in effect at the closing of this offering and affecting the rights of holders of our capital stock is set forth below. The description is intended as a summary, and is qualified in its entirety by reference to the form of our amended and restated certificate of incorporation and the form of our amended and restated bylaws to be adopted in connection with our initial public offering that will be filed with the registration statement relating to this prospectus.

        As of March 1, 2012, and after giving effect to (1) the issuance of 26,884,442 shares of our Series B preferred stock on March 21, 2012 and (2) the automatic conversion of all of our outstanding preferred stock into 67,936,761 shares of common stock immediately prior to the closing of this offering, there were outstanding:

    78,620,761 shares of our common stock held by approximately 26 stockholders; and

    3,252,500 shares of common stock subject to outstanding options.

        The following descriptions of our capital stock is not complete and is subject to and qualified in its entirety by our amended and restated certificate of incorporation and amended and restated bylaws and by the provisions of applicable Delaware law. Copies of these documents are filed with the SEC as exhibits to our registration statement, of which this prospectus forms a part. The descriptions of our common stock and preferred stock reflect changes to our capital structure that will occur immediately in connection with the closing of this offering.

Common Stock

        Voting Rights.    Each holder of common stock is entitled to one vote for each share on all matters submitted to a vote of the stockholders.

        Dividends.    Subject to the preferences that may be applicable to any outstanding preferred stock, holders of our common stock shall be entitled to receive ratably any dividends that may be declared by the board of directors out of funds legally available for that purpose.

        Liquidation.    In the event of our liquidation, dissolution or winding up, holders of our common stock are entitled to share ratably in all assets remaining after payment of liabilities and the liquidation preference of any outstanding preferred stock.

        No Preemptive or Similar Rights.    Our common stock is not entitled to preemptive rights and is not subject to conversion, redemption or sinking fund provisions.

Preferred Stock

        Immediately prior to the closing of this offering, all outstanding shares of our preferred stock will be converted into shares of common stock. Under our amended and restated certificate of incorporation that will be in effect in connection with the closing of this offering our board of directors has the authority, subject to limitations prescribed by Delaware law, to issue preferred stock in one or more series, to establish from time to time the number of shares to be included in each series and to fix the designation, powers, preferences and rights of the shares of each series and any of its qualifications, limitations and restrictions. Our board of directors also can increase or decrease the number of shares of any series, but not below the number of shares of that series then outstanding,

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without any further vote or action by our stockholders. Our board of directors may authorize the issuance of preferred stock with voting or conversion rights that could adversely affect the voting power or other rights of the holders of the common stock. The issuance of preferred stock, while providing flexibility in connection with possible acquisitions and other corporate purposes, could, among other things, have the effect of delaying, deferring or preventing a change in control of our company and may adversely affect the market price of our common stock and the voting and other rights of the holders of common stock. We have no current plan to issue any shares of preferred stock.

Anti-Takeover Provisions

        Maximum Number of Directors.    Our amended and restated certificate of incorporation and amended and restated bylaws do not limit the maximum size of our board of directors.

        No Cumulative Voting.    Under Delaware law, cumulative voting for the election of directors is not permitted unless a corporation's certificate of incorporation authorizes cumulative voting. Our amended and restated certificate of incorporation and amended and restated bylaws do not provide for cumulative voting in the election of directors.

        Special Stockholder Meetings.    Our amended and restated certificate of incorporation and amended and restated bylaws provide that a special meeting of stockholders may be called only by a written request from a majority of our board of directors.

        No Stockholder Action by Written Consent.    Our amended and restated certificate of incorporation and amended and restated bylaws require that any action required or permitted to be taken by our stockholders must be effected at a duly called annual or special meeting of stockholders and may not be effected by a consent in writing.

        Issuance of Undesignated Preferred Stock.    Our amended and restated certificate of incorporation provide our board of directors with the authority, without further action by the stockholders, to issue up to            shares of undesignated preferred stock with rights and preferences, including voting rights, designated from time to time by the board of directors.

        Section 203 of the Delaware General Corporation Law.    Upon the closing of this offering, we will be governed by the provisions of Section 203 of the Delaware General Corporation Law regulating corporate takeovers. This section prevents some Delaware corporations from engaging, under some circumstances, in a business combination, which includes a merger or sale of at least 10% of the corporation's assets with any interested stockholder, meaning a stockholder who, together with affiliates and associates, owns or, within three years prior to the determination of interested stockholder status, did own 15% or more of the corporation's outstanding voting stock, unless:

    the transaction is approved by the board of directors prior to the time that the interested stockholder became an interested stockholder;

    upon consummation of the transaction which resulted in the stockholder's becoming an interested stockholder, the interested stockholder owned at least 85% of the voting stock of the corporation outstanding at the time the transaction commenced, excluding stock owned by directors who are also officers of the corporation; or

    subsequent to such time that the stockholder became an interested stockholder the business combination is approved by the board of directors and authorized at an annual or special meeting of stockholders by at least two-thirds of the outstanding voting stock which is not owned by the interested stockholder.

A Delaware corporation may "opt out" of these provisions with an express provision in its original certificate of incorporation or an express provision in its certificate of incorporation or bylaws resulting

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from a stockholders' amendment approved by at least a majority of the outstanding voting shares. We have not opted out of these provisions. As a result, mergers or other takeover or change in control attempts of us may be discouraged or prevented.

        Stockholder Advance Notice Procedure.    Our amended and restated bylaws establish an advance notice procedure for stockholders to make nominations of candidates for election as directors or to bring other business before an annual meeting of our stockholders. The amended and restated bylaws provide that any stockholder wishing to nominate persons for election as directors at, or bring other business before, an annual meeting must deliver to our secretary a written notice of the stockholder's intention to do so. To be timely, the stockholder's notice must be delivered to or mailed and received by us not less than 90 days before the anniversary date of the preceding annual meeting, except that if the annual meeting is set for a date that is not within 30 days before or 60 days after such anniversary date, we must receive the notice not later than the close of business on the tenth day following the day on which we provide the notice or public disclosure of the date of the meeting. The notice must include the following information:

    the name and address of the stockholder who intends to make the nomination and the name and address of the person or persons to be nominated or the nature of the business to be proposed;

    a representation that the stockholder is a holder of record of our capital stock entitled to vote at such meeting and intends to appear in person or by proxy at the meeting to nominate the person or persons or to introduce the business specified in the notice;

    if applicable, a description of all arrangements or understandings between the stockholder and each nominee and any other person or persons, naming such person or persons, pursuant to which the nomination is to be made by the stockholder;

    such other information regarding each nominee or each matter of business to be proposed by such stockholder as would be required to be included in a proxy statement filed under the SEC's proxy rules if the nominee had been nominated, or intended to be nominated, or the matter had been proposed, or intended to be proposed, by the board of directors;

    if applicable, the consent of each nominee to serve as a director if elected; and

    such other information that the board of directors may request in its discretion.

Registration Rights

        We entered into a second amended and restated investors' rights agreement, dated June 6, 2011, as amended June 7, 2011, with the holders of our preferred stock. Under the amended and restated investors' rights agreement, holders of shares having registration rights can demand that we file a registration statement.

        Demand Registration Rights.    At any time after 180 days after the closing of this offering, fifty percent or more of the shares having demand registration rights may request that we register all or a portion of their share. We will effect the registration as requested, unless, in the good faith judgment of our board of directors, such registration would be materially detrimental to the company and its stockholders and should be delayed. In addition, when we are eligible for the use of Form S-3, or any successor form, holders of a majority of the shares having demand registration rights may make unlimited requests that we register all or a portion of their common stock for sale under the Securities Act on Form S-3, or any successor form, so long as the aggregate price to the public in connection with any such offering is at least $1.0 million.

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        Incidental Registration Rights.    In addition, if at any time after this offering we register any shares of our common stock, the holders of all shares having registration rights are entitled to notice of the registration and to include all or a portion of their common stock in the registration.

        Other Provisions.    In the event that any registration in which the holders of registrable shares participate pursuant to the registration rights agreement is an underwritten public offering, the number of registrable shares to be included may, in specified circumstances, be limited due to market conditions.

        We will pay all registration expenses, other than underwriting discounts and selling commissions, and the reasonable fees and expenses, other than underwriting discounts and selling commissions, and the reasonable fees and expenses of a single special counsel for the selling stockholders, related to any demand or piggyback registration. The investors' rights agreement contains customary cross-indemnification provisions, pursuant to which we are obligated to indemnify the selling stockholders in the event of material misstatements or omissions in the registration statement attributable to us, and they are obligated to indemnify us for material misstatements or omissions in the registration statement attributable to them. The demand, piggyback and Form S-3 registration rights described above will expire, with respect to any particular stockholder, five years after our initial public offering or when that stockholder can sell any of its shares under Rule 144 of the Securities Act.

Limitation on Liability and Indemnification of Directors and Officers

        See "Management—Limitation on Liability and Indemnification of Directors and Officers."

Transfer Agent and Registrar

        Our transfer agent and registrar for our common stock is                              .

Listing

        We intend to apply to have our common stock listed on the NASDAQ Global Market under the symbol "TSRO."

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SHARES ELIGIBLE FOR FUTURE SALE

        Prior to this offering, there was no public market for our common stock, and a liquid trading market for our common stock may not develop or be sustained after this offering. Future sales of substantial amounts of our common stock in the public market, including shares issued upon exercise of outstanding options, or the perception that such sales could occur, could materially and adversely affect the market price of our common stock and could impair our future ability to raise capital in the future. Furthermore, because only a limited number of shares of our common stock will be available for sale in the public market for a period of several months after closing of this offering due to contractual and legal restrictions on resale described below, sales of a substantial number of shares of our common stock in the public market after such restrictions lapse, or the perception that those sales may occur, could adversely affect the prevailing market price of our common stock and our ability to raise capital in the future.

        Based upon the number of shares outstanding as of March 1, 2012, upon the closing of this offering, we will have outstanding an aggregate of            shares of our common stock outstanding. The number of shares outstanding upon completion of this offering assumes:

    the issuance of 26,884,442 shares of our Series B preferred stock on March 21, 2012;

    the conversion of all outstanding shares of our preferred stock into an aggregate of 67,936,761 shares of common stock immediately prior to the closing of this offering;

    no exercise of the underwriters' over-allotment options; and

    no exercise of outstanding options.

        Of these shares, approximately            sold in this offering, including any shares sold in this offering in connection with the exercise by the underwriters of their over-allotment option, will be freely tradable without restriction or further registration under the Securities Act.

        Approximately            shares of our common stock that will be outstanding immediately following this offering, including the shares owned by our existing equity investors, will be deemed "restricted securities" or "control securities" as that term is defined under Rule 144. Restricted securities may be sold in the public market only if registered, or if they qualify for an exemption from registration, under the Securities Act, such as under Rule 144 or Rule 701, which we summarize below.

        We may issue shares of common stock from time to time as consideration for future acquisitions, investments or other corporate purposes. In the event that any such acquisition, investment or other transaction is significant, the number of shares of common stock that we may issue may in turn be significant. We may also grant registration rights covering those shares of common stock issued in connection with any such acquisition and investment.

        In addition, shares of common stock that are either subject to outstanding options or reserved for future issuance under our equity incentive plans will become eligible for sale in the public market to the extent permitted by the provisions of various vesting schedules, the lock-up agreements and Rule 144 and Rule 701 under the Securities Act.

Rule 144

        In general, under Rule 144 under the Securities Act, as in effect on the date of this prospectus, beginning 90 days after the effective date of the registration statement of which this prospectus is a part, a person who is not one of our affiliates at any time during the three months preceding a sale, and who has beneficially owned shares of our common stock for at least six months, would be entitled to sell an unlimited number of shares of our common stock provided current public information about us is available and, after owning such shares for at least one year, would be entitled to sell an unlimited

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number of shares of our common stock without regard to the current public information requirements of Rule 144.

        Beginning 90 days after the effective date of the registration statement of which this prospectus is a part, our affiliates who have beneficially owned shares of our common stock for at least six months are entitled to sell within any three-month period a number of shares that does not exceed the greater of:

    1% of the number of shares of our common stock then outstanding, which will equal approximately            shares, or             shares if the underwriters exercise their over-allotment option in full, immediately following this offering, based on the number of shares of our common stock outstanding upon the closing of this offering; or

    the average weekly trading volume of our common stock on the NASDAQ Global Market during the four calendar weeks preceding the filing of a notice on Form 144 with respect to the sale.

        Sales under Rule 144 by our affiliates are also subject to manner of sale provisions and notice requirements and to the availability of current public information about us.

        Upon expiration of the 180-day lock-up period described below, approximately            shares of our common stock will be eligible for sale under Rule 144. We cannot estimate the number of shares of our common stock that our existing stockholders will elect to sell under Rule 144.

Rule 701

        In general, Rule 701 as currently in effect, generally allows a stockholder who purchased shares of our common stock pursuant to a written compensatory plan or contract and who is not deemed to have been an affiliate of ours during the immediately preceding 90 days to sell these shares in reliance upon Rule 144, but without being required to comply with the public information, holding period, volume limitation, or notice provisions of Rule 144. Rule 701 also permits affiliates of ours to sell their Rule 701 shares under Rule 144 without complying with the holding period requirements of Rule 144. All holders of Rule 701 shares; however, are required to wait until 90 days after the date of this prospectus before selling such shares pursuant to Rule 701 and until expiration of the lock-up agreements to which they are subject.

Lock-up Agreements

        In connection with this offering, we, our directors, our executive officers and our other stockholders have agreed with the underwriters, subject to certain exceptions, not to dispose of or hedge any shares of our common stock or securities convertible into or exchangeable for shares of common stock during the period from the date of the lock-up agreement continuing through the date 180 days after the date of this prospectus, except with the prior written consent of Citigroup and Morgan Stanley. Each of Citigroup and Morgan Stanley have advised us that they have no current intent or arrangement to release any of the shares subject to the lock-up agreements prior to the expiration of the lock-up period. The lock-up agreements permit stockholders to transfer common stock and other securities subject to the lock-up agreements in certain circumstances.

        The 180-day restricted period described in the preceding paragraph will be automatically extended if:

    during the last 17 days of the 180-day restricted period we issue an earnings release or announce material news or a material event; or

    prior to the expiration of the 180-day restricted period, we announce that we will release earnings results during the 16-day period beginning on the last day of the 180-day period,

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in which case the restrictions described in the preceding paragraph will continue to apply until the expiration of the 18-day period beginning on the date of the issuance of the earnings release or the announcement of the material news or material event.

        Following the lock-up periods set forth in the agreements described above, and assuming that the representatives of the underwriters do not release any parties from these agreements and that there is no extension of the lock-up period, all of the shares of our common stock that are restricted securities or are held by our affiliates as of the date of this prospectus will be eligible for sale in the public market in compliance with Rule 144 under the Securities Act.

Equity Incentive Plans

        Upon the closing of this offering, we intend to file one or more registration statements on Form S-8 under the Securities Act to register all shares of common stock issued or reserved for issuance under our equity incentive plans, including the equity incentive plans we adopted in connection with this offering. Accordingly, shares registered under such registration statement will be available for sale in the open market, unless such shares are subject to vesting restrictions with us or the lock-up restrictions described above. For more information on our equity incentive plans, see "Executive and Director Compensation—Employee Benefit Plans."

Registration Rights

        Some of our security holders have the right to require us to register shares of our common stock for resale in some circumstances. For more information, see "Description of Capital Stock—Registration Rights."

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MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES

        The following is a general discussion of the material U.S. federal income and estate tax consequences to non-U.S. holders (as defined below) of the ownership and disposition of our common stock purchased in the offering. It is not intended to be a complete analysis of all the potential U.S. federal income and estate tax consequences that may be relevant. Except where noted, this summary deals only with common stock that is purchased by a non-U.S. holder pursuant to this offering and that is held as a capital asset within the meaning of Section 1121 of the U.S. Internal Revenue Code of 1986, as amended, or the Code, (generally property held for investment) by the non-U.S. holder.

        A "non-U.S. holder" is a beneficial owner of our common stock purchased in the offering that is not a U.S. person or a partnership for U.S. federal income and estate tax purposes. For this purpose, a U.S. person is:

    an individual who is a citizen or resident of the United States;

    a corporation (or any other entity treated as a corporation for U.S. federal income tax purposes) created or organized in or under the laws of the United States, any state thereof, or the District of Columbia;

    an estate whose income is subject to U.S. federal income taxation regardless of its source; or

    a trust if (a) a U.S. court is able to exercise primary supervision over the administration of the trust and one or more U.S. persons have authority to control all substantial decisions of the trust, or (b) it has a valid election in effect to be treated as a U.S. person.

        If an entity treated as a partnership for U.S. federal income tax purposes holds our common stock, the U.S. federal income tax treatment of a partner will generally depend upon the status of the partner and upon the activities of the partnership. Accordingly, partnerships that hold our common stock and partners in such partnerships should consult their respective tax advisors with respect to the U.S. federal income and estate tax consequences of the ownership and disposition of our common stock.

        The following discussion is based on current provisions of the Code, the U.S. Treasury Regulations, and administrative and judicial interpretations thereof, all as in effect on the date hereof, and all of which are subject to differing interpretations or to change, possibly with retroactive effect. Accordingly, each non-U.S. holder should consult its tax advisors regarding the U.S. federal, state, local, and non-U.S. income, estate and other tax consequences of acquiring, holding, and disposing of shares of our common stock. This discussion does not address any U.S. federal tax consequences other than income and estate tax consequences or any tax consequences arising under the laws of any state, local, or non-U.S. taxing jurisdiction. This discussion also does not address all aspects of U.S. federal income and estate taxation that may be relevant in light of a non-U.S. holder's special tax status or special circumstances, including (without limitation):

    U.S. expatriates;

    "Controlled foreign corporations" or "passive foreign investment companies;"

    Shareholders that acquired our common stock through the exercise of employee stock options or otherwise as compensation or through a tax-qualified retirement plan;

    Shareholders that hold our common stock as part of a "hedge," "straddle," "conversion transaction," "synthetic security," constructive sale transaction, or other integrated investment or transaction;

    Shareholders subject to the alternative minimum tax provisions of the Code;

    Dealers in securities or currencies;

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    Traders in securities that use a mark-to-market method of accounting for U.S. income tax purposes;

    Financial institutions;

    Insurance companies;

    Real estate investment trusts (REITs);

    Regulated investment companies (RICs);

    Subchapter S corporations; or

    Tax-exempt organizations.

        THIS SUMMARY IS FOR GENERAL INFORMATION ONLY AND IS NOT TAX ADVICE. INVESTORS CONSIDERING THE PURCHASE OF SECURITIES PURSUANT TO THIS OFFERING ARE ENCOURAGED TO CONSULT THEIR OWN TAX ADVISORS REGARDING THE APPLICATION OF THE U.S. FEDERAL INCOME AND ESTATE TAX LAWS TO THEIR PARTICULAR SITUATIONS AND THE APPLICATION OF OTHER FEDERAL TAX LAWS, FOREIGN, STATE AND LOCAL LAWS, AND TAX TREATIES.

Distributions

        Distributions in cash or other property on our common stock will constitute dividends for U.S. federal income tax purposes to the extent paid from our current or accumulated earnings and profits, as determined under U.S. federal income tax principles. Amounts not treated as dividends for U.S. federal income tax purposes will constitute a return of capital and will first be applied against and reduce a holder's adjusted basis in the common stock, but not below zero, and then the excess, if any, will be treated as gain from the sale of common stock, as described below.

        As discussed above in the section titled "Dividend Policy," we do not intend to pay cash dividends on our common stock for the foreseeable future. In the event that we do make distributions on our common stock, amounts paid to a non-U.S. holder of common stock that are treated as dividends for U.S. federal income tax purposes generally will be subject to U.S. withholding tax at a rate of 30% of the gross amount of the dividends or such lower rate as may be specified by an applicable income tax treaty. In order to receive a reduced treaty rate, a non-U.S. holder generally must provide a valid Internal Revenue Service, or IRS, Form W-8BEN (or other applicable Form W-8) certifying qualification for the reduced rate.

        Dividends received by a non-U.S. holder that are effectively connected with a U.S. trade or business conducted by the non-U.S. holder (and, if required by an applicable income tax treaty, are attributable to a U.S. permanent establishment) are exempt from such withholding tax. In order to obtain this exemption, a non-U.S. holder must provide a valid IRS Form W-8ECI or other applicable form properly certifying such exemption. Such effectively connected dividends, although not subject to withholding tax, will generally be subject to regular U.S. federal income tax as if the non-U.S. holder were a U.S. person, unless an applicable income tax treaty provides otherwise. A non-U.S. holder that is taxable as a corporation for U.S. federal income tax purposes that receives effectively connected dividends may also be subject to an additional "branch profits tax" imposed at a rate of 30% (or such lower rate as may be specified by an applicable income tax treaty) on the earnings and profits attributable to its effectively connected income.

        Non-U.S. holders should consult their tax advisors regarding their entitlement to benefits under a relevant income tax treaty.

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Gain on Disposition of Common Stock

        A non-U.S. holder generally will not be subject to U.S. federal income tax on any gain realized upon the sale or other disposition of common stock received in the offering unless:

    the gain is "effectively connected" with the non-U.S. holder's conduct of a trade or business in the United States (and, if required by an applicable income tax treaty, is attributable to a U.S. permanent establishment);

    the non-U.S. holder is a nonresident alien individual present in the United States for 183 days or more in the taxable year of the disposition and certain other requirements are met; or

    our common stock constitutes a U.S. real property interest by reason of our status as a U.S. real property holding corporation, as defined below, at any time within the five-year period preceding the disposition or the non-U.S. holder's holding period, whichever period is shorter (the "relevant period").

        Unless an applicable treaty provides otherwise, gain described in the first bullet point above generally will be subject to regular U.S. federal income tax as if the non-U.S. holder were a U.S. person and, in the case of non-U.S. holders taxed as corporations, the branch profits tax described above.

        If an individual falls under the second bullet point above, such individual will generally be subject to a flat 30% tax (or such lower rate as may be specified by an applicable income tax treaty) on the gain derived from a sale, which may be offset by certain U.S.-source capital losses (notwithstanding the fact that such individual is not considered a resident of the United States).

        Generally, a corporation is a U.S. real property holding corporation, or USRPHC, if the fair market value of its U.S. real property interests, as defined in the Code and applicable Treasury regulations, equals or exceeds 50% of the aggregate fair market value of its worldwide real property interests and its other assets used or held for use in a trade or business.

        We believe that we are not, and currently do not anticipate becoming, a USRPHC. However, there can be no assurance that our current analysis is correct or that we will not become a USRPHC in the future. Even if we are or become a USRPHC, as long as our common stock is "regularly traded on an established securities market," within the meaning of applicable Treasury regulations, such common stock will be treated as U.S. real property interests only if the non-U.S. holder actually or constructively held more than 5% of such regularly traded common stock at some time during the relevant period. If we are determined to be a USRPHC and the foregoing exception does not apply, among other things, a purchaser may be required to withhold 10 percent of the gross proceeds payable to the non-U.S. holder from a disposition of our common stock, and a non-U.S. holder generally will be taxed on its net gain derived from the disposition in the same manner as U.S. persons.

        Non-U.S. holders should consult their own tax advisors regarding the potential consequences and the potential applicability of any income tax treaty in their particular circumstances.

Backup Withholding and Information Reporting

        Information reporting and backup withholding may apply to dividends paid with respect to our common stock and to proceeds from the sale or other disposition of our common stock. In certain circumstances, non-U.S. holders may avoid information reporting and backup withholding tax requirements if they certify under penalties of perjury as to their status as non-U.S. holders or otherwise establish an exemption and certain other requirements are met. The certification procedures required to claim a reduced rate of withholding under a treaty generally will satisfy the certification requirements necessary to avoid the backup withholding tax as well. Non-U.S. holders should consult

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their own tax advisors regarding the application of the information reporting and backup withholding rules to them.

        Backup withholding is not an additional tax. Amounts withheld under the backup withholding rules from a payment to a non-U.S. holder generally may be refunded or credited against the non-U.S. holder's U.S. federal income tax liability, if any, provided that the required information is timely filed with the IRS.

U.S. Federal Estate Tax

        Shares of our common stock owned or treated as owned by an individual who is a non-U.S. holder at the time of his or her death will be included in such non-U.S. holder's gross estate for U.S. federal estate tax purposes, unless an applicable estate tax treaty provides otherwise, and, therefore, may be subject to U.S. federal estate tax.

Legislation Relating to Foreign Accounts

        On February 8, 2012, the Treasury Department issued proposed regulations relating to the Foreign Account Tax Compliance Act, or FATCA, which was enacted in March of 2010. As a general matter, FATCA imposes a 30% withholding tax on dividends on, and gross proceeds from the sale or other disposition of, our common stock if paid to a foreign entity unless (i) if the foreign entity is a "foreign financial institution," the foreign entity undertakes certain due diligence, reporting, withholding, and certification obligations, (ii) if the foreign entity is not a "foreign financial institution," the foreign entity identifies certain of its U.S. investors, or (iii) the foreign entity is otherwise excepted under FATCA. Under the proposed regulations, withholding is required (i) with respect to dividends on our common stock beginning on January 1, 2014, and (ii) with respect to gross proceeds from a sale or other disposition of our common stock that occurs on or after January 1, 2015.

        Notwithstanding the foregoing, the proposed regulations will not be effective until issued in final form. There can be no assurance either as to when final regulations relating to FATCA will be issued or as to the particular form that those final regulations might take. If withholding is required under FATCA on a payment related to our common stock, investors that otherwise would not be subject to withholding (or that otherwise would be entitled to a reduced rate of withholding) on such payment generally will be required to seek a refund or credit from the IRS to obtain the benefit of such exemption or reduction (provided that such benefit is available). We will not pay any additional amounts in respect of amounts withheld under FATCA. Prospective investors should consult their tax advisors regarding the effect of FATCA in their particular circumstances.

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UNDERWRITING

        Citigroup Global Markets Inc., Morgan Stanley & Co. LLC and Leerink Swann LLC are acting as joint book-running managers of the offering and as representatives of the underwriters named below. Subject to the terms and conditions stated in the underwriting agreement dated the date of this prospectus, each underwriter named below has severally agreed to purchase, and we have agreed to sell to that underwriter, the number of shares set forth opposite the underwriter's name.

Underwriter
  Number
of Shares

Citigroup Global Markets Inc. 

   

Morgan Stanley & Co. LLC

   

Leerink Swann LLC

   

BMO Capital Markets Corp. 

   

Robert W. Baird & Co. 

   
     

Total

   
     

        The underwriting agreement provides that the obligations of the underwriters to purchase the shares included in this offering are subject to approval of legal matters by counsel and to other conditions. The underwriters are obligated to purchase all the shares (other than those covered by the over-allotment option described below) if they purchase any of the shares.

        Shares sold by the underwriters to the public will initially be offered at the initial public offering price set forth on the cover of this prospectus. Any shares sold by the underwriters to securities dealers may be sold at a discount from the initial public offering price not to exceed $      per share. If all the shares are not sold at the initial offering price, the underwriters may change the offering price and the other selling terms. The representatives have advised us that the underwriters do not intend to make sales to discretionary accounts.

        If the underwriters sell more shares than the total number set forth in the table above, we have granted to the underwriters an option, exercisable for 30 days from the date of this prospectus, to purchase up to            additional shares at the public offering price less the underwriting discount. The underwriters may exercise the option solely for the purpose of covering over-allotments, if any, in connection with this offering. To the extent the option is exercised, each underwriter must purchase a number of additional shares approximately proportionate to that underwriter's initial purchase commitment. Any shares issued or sold under the option will be issued and sold on the same terms and conditions as the other shares that are the subject of this offering.

        We, our officers and directors, and our other stockholders have agreed that, for a period of 180 days from the date of this prospectus, we and they will not, without the prior written consent of Citigroup and Morgan Stanley, dispose of or hedge any shares or any securities convertible into or exchangeable for our common stock, subject to certain exceptions. Citigroup and Morgan Stanley in their sole discretion may release any of the securities subject to these lock-up agreements at any time, which, in the case of officers and directors, shall be with notice. Notwithstanding the foregoing, if (i) during the last 17 days of the 180-day restricted period, we issue an earnings release or material news or a material event relating to our company occurs; or (ii) prior to the expiration of the 180-day restricted period, we announce that we will release earnings results during the 16-day period beginning on the last day of the 180-day restricted period, the restrictions described above shall continue to apply until the expiration of the 18-day period beginning on the issuance of the earnings release or the occurrence of the material news or material event.

        Prior to this offering, there has been no public market for our shares. Consequently, the initial public offering price for the shares was determined by negotiations between us and the representatives.

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Among the factors considered in determining the initial public offering price were our results of operations, our current financial condition, our future prospects, our markets, the economic conditions in and future prospects for the industry in which we compete, our management, and currently prevailing general conditions in the equity securities markets, including current market valuations of publicly traded companies considered comparable to our company. We cannot assure you, however, that the price at which the shares will sell in the public market after this offering will not be lower than the initial public offering price or that an active trading market in our shares will develop and continue after this offering.

        We intend to apply to have our shares listed on the Nasdaq Global Market under the symbol "TSRO."