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Sunesis Pharmaceuticals to Present Data at the Annual Meeting of the American Association for Cancer Research

04/13/07

SOUTH SAN FRANCISCO, Calif., April 13, 2007 /PRNewswire-FirstCall via COMTEX News Network/ -- Sunesis Pharmaceuticals, Inc. (Nasdaq: SNSS) today announced that the company will present data at the Annual Meeting of the American Association for Cancer Research (AACR) being held April 14-18, 2007 in Los Angeles, California.

Data being presented in a poster session will focus on non-clinical data on SNS-032, a highly selective and potent inhibitor of cyclin-dependent kinases (CDKs) 2, 7 and 9 that is currently in a Phase 1 clinical trial for B-cell malignancies. Abstract #1815: "SNS-032 is a potent and selective CDK 2, 7 and 9 inhibitor that drives apoptosis in the multiple myeloma cell line RPMI-8226" will be presented on Monday, April 16, 2007 from 8:00 a.m. to 12:00 p.m. in poster section 7, board #1.

About Sunesis' Oncology Programs

Sunesis has built a rich portfolio of product candidates in oncology focused on novel pathways and targets, including inhibition of the cell-cycle and survival signaling. Sunesis is currently conducting Phase 2 clinical trials in lung and ovarian cancer and a Phase 1 clinical trial in acute myeloid leukemia for its lead compound, SNS-595. SNS-032, Sunesis' CDK inhibitor compound, is being evaluated in Phase 1 clinical trials in B-cell malignancies and in advanced solid tumors. The company's Aurora kinase inhibitor, SNS-314 is expected to begin Phase 1 clinical trials in the first half of 2007. In addition, Sunesis is developing novel small molecule inhibitors of Raf kinase and other oncology kinases in collaboration with Biogen Idec.

About Sunesis Pharmaceuticals

Sunesis is a clinical-stage biopharmaceutical company focused on the discovery, development and commercialization of novel small molecule therapeutics for oncology and other serious diseases. Sunesis has built a broad product candidate portfolio through internal discovery and in-licensing of targeted cancer therapeutics. Sunesis is advancing its product candidates through in-house research and development efforts and strategic collaborations with leading pharmaceutical and biopharmaceutical companies.

Forward-Looking Statements

This press release may contain forward-looking statements that involve substantial risks and uncertainties. Sunesis may not actually achieve the plans, intentions or expectations contained in such forward-looking statements. Actual results or events could differ materially from the plans, intentions and expectations contained in such forward-looking statements. Sunesis does not assume any obligation to update any such forward-looking statements. For further information on Sunesis Pharmaceuticals, please visit http://www.sunesis.com.

SOURCE Sunesis Pharmaceuticals, Inc.

investors, Eric Bjerkholt, SVP, Corporate Development & Finance of Sunesis
Pharmaceuticals, Inc., +1-650-266-3717; or media, Michelle Corral, +1-415-794-8662,
or Karen L. Bergman, +1-650-575-1509, both of BCC Partners, for Sunesis
Pharmaceuticals, Inc.
http://www.sunesis.com/

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