Sunesis Pharmaceuticals, Inc. To Report Second Quarter 2006 Financial Results August 10, 2006

SOUTH SAN FRANCISCO, Calif., Aug. 3 /PRNewswire-FirstCall/ -- Sunesis Pharmaceuticals, Inc. , a clinical-stage biopharmaceutical company focused on the discovery, development and commercialization of novel small molecule therapeutics, today announced that Sunesis senior management will hold an investor conference call to discuss financial results for the second quarter 2006 on Thursday, August 10, 2006 at 7:30 a.m. PDT/10:30 a.m. EDT.

Individual and institutional investors can access the call via (800) 946-0706 (U.S. and Canada) or (719) 457-2638 (international). To access the live audio webcast or the subsequent archived recording, visit the “Investors and Media -- Calendar of Events” section of the Sunesis website at http://www.sunesis.com . Please log on to Sunesis’ website several minutes prior to the start of the presentation to ensure adequate time for any software download that may be necessary.

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 novel cancer therapeutics. Sunesis is advancing its product candidates through in-house research and development efforts and strategic collaborations with leading pharmaceutical and biopharmaceutical companies. For further information on Sunesis Pharmaceuticals, please visit http://www.sunesis.com .

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.

Sunesis Pharmaceuticals, Inc.

CONTACT: investors, Eric Bjerkholt, CFO of Sunesis Pharmaceuticals, Inc.,+1-650-266-3717; or media, Michelle Corral or Karen L. Bergman, both of BCCPartners, +1-650-575-1509, or +1-415-794-8662, for Sunesis Pharmaceuticals

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