UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934

August 16, 2010 (Date of Report)
(Date of Earliest Event Reported)

Trubion Pharmaceuticals, Inc.

(Exact Name of Registrant as Specified in Charter)

Delaware
(State or Other
Jurisdiction
of Incorporation) 001-33054
(Commission File No.) 52-2385898
(IRS Employer
Identification No.)

2401 Fourth Avenue, Suite 1050, Seattle, WA 98121
(Address of Principal Executive Offices, including Zip Code)

(206) 838-0500
(Registrant’s Telephone Number, Including Area Code)

None
(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

þ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 2.02. Results of Operations and Financial Condition.

On August 16, 2010, Trubion Pharmaceuticals, Inc. announced its financial results for the second quarter ended June 30, 2010. The full text of the press release issued in connection with the announcement is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

99.1       Press Release of Trubion Pharmaceuticals, Inc., dated August 16, 2010.

SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	TRUBION PHARMACEUTICALS, INC.
Date: August 16, 2010	By:	/s/ John A. Bencich
		John A. Bencich
		Vice President and Chief Financial Officer

INDEX TO EXHIBITS

Exhibit No.	Description
99.1	Press Release of Trubion Pharmaceuticals, Inc., dated August 16, 2010.