Sunesis to Host Conference Call on August 9th to Discuss Second Quarter Financial Results and Recent Highlights

Sunesis Pharmaceuticals, Inc. (Nasdaq:SNSS) today announced that it will host a conference call on Thursday, August 9th, 2012 at 10:30 a.m. Eastern Time to discuss corporate updates and financial results for the second quarter ended June 30, 2012.

The call can be accessed by dialing [phone] (U.S. and Canada) or [phone] (international), and entering passcode 49381836.

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 www.sunesis.com. The webcast will be recorded and available for replay on the company's website for two weeks.

About Sunesis Pharmaceuticals

Sunesis is a biopharmaceutical company focused on the development and commercialization of new oncology therapeutics for the treatment of solid and hematologic cancers. Sunesis has built a highly experienced cancer drug development organization committed to advancing its lead product candidate, vosaroxin, in multiple indications to improve the lives of people with cancer. For additional information on Sunesis, please visit http://www.sunesis.com.

The Sunesis Pharmaceuticals, Inc. logo is available at http://www.globenewswire.com/newsroom/prs/?pkgid=8773

SUNESIS and the logos are trademarks of Sunesis Pharmaceuticals, Inc.

CONTACT: Investor and Media Inquiries:
         David Pitts
         Argot Partners
         212-600-1902
         
         Eric Bjerkholt
         Sunesis Pharmaceuticals Inc.
         650-266-3717