EXHIBIT 1

JOINT FILING AGREEMENT

THIS JOINT FILING AGREEMENT is entered into as of June 16, 2010, by and among the parties hereto.  The undersigned hereby agree that the Statement on Schedule 13D with respect to the common stock, par value $0.001 per share (the “Common Stock”) of Hana Biosciences, Inc. and any amendment thereafter signed by each of the undersigned shall be (unless otherwise determined by the undersigned) filed on behalf of each of the undersigned pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended.

Dated:  June 16, 2010	WARBURG PINCUS PRIVATE EQUITY X, L.P.
	By: Warburg Pincus X, L.P., its general partner
	By: Warburg Pincus X LLC, its general partner
	By: Warburg Pincus Partners, LLC, its sole member
	By: Warburg Pincus & Co., its managing member
	By:	/s/ Scott A. Arenare
		Name: Scott A. Arenare
		Title: Partner
Dated:  June 16, 2010	WARBURG PINCUS X PARTNERS, L.P.
	By: Warburg Pincus X, L.P., its general partner
	By: Warburg Pincus X LLC, its general partner
	By: Warburg Pincus Partners, LLC, its sole member
	By: Warburg Pincus & Co., its managing member
	By:	/s/ Scott A. Arenare
		Name: Scott A. Arenare
		Title: Partner
Dated:  June 16, 2010	WARBURG PINCUS X, L.P.
	By: Warburg Pincus X LLC, its general partner
	By: Warburg Pincus Partners, LLC, its sole member
	By: Warburg Pincus & Co., its managing member
	By:	/s/ Scott A. Arenare
		Name: Scott A. Arenare
		Title: Partner

Dated:  June 16, 2010	WARBURG PINCUS X LLC
	By: Warburg Pincus Partners, LLC, its sole member
	By: Warburg Pincus & Co., its managing member
	By:	/s/ Scott A. Arenare
		Name: Scott A. Arenare
		Title: Partner
Dated:  June 16, 2010	WARBURG PINCUS PARTNERS, LLC
	By: Warburg Pincus & Co., its managing member
	By:	/s/ Scott A. Arenare
		Name: Scott A. Arenare
		Title: Partner
Dated:  June 16, 2010	WARBURG PINCUS & CO.
	By:	/s/ Scott A. Arenare
		Name: Scott A. Arenare
		Title: Partner
Dated:  June 16, 2010	WARBURG PINCUS LLC
	By:	/s/ Scott A. Arenare
		Name: Scott A. Arenare
		Title: Managing Director
Dated:  June 16, 2010	CHARLES R. KAYE
	By:	/s/ Scott A. Arenare
		Scott A. Arenare, Attorney-in-fact*
Dated:  June 16, 2010	JOSEPH P. LANDY
	By:	/s/ Scott A. Arenare
		Scott A. Arenare, Attorney-in-fact**

 _________________

* Power of Attorney given by Mr. Kaye was previously filed with the SEC on March 2, 2006, as an exhibit to a Schedule 13D filed by Building Products, LLC with respect to Builders FirstSource, Inc.

**           Power of Attorney given by Mr. Landy was previously filed with the SEC on March 2, 2006, as an exhibit to a Schedule 13D filed by Building Products, LLC with respect to Builders FirstSource, Inc.

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