Cell Genesys, Inc. Confirms Upcoming Clinical Data Presentations For Two GVAX(R) Cancer Vaccine Programs

SOUTH SAN FRANCISCO, Calif., Oct. 20 /PRNewswire-FirstCall/ -- Cell Genesys, Inc. today confirmed that new clinical data from both its GVAX(R) Vaccine for Pancreatic Cancer and GVAX(R) Vaccine for Leukemia programs will be presented at two upcoming medical conferences later this year. Following is the schedule of presentations:

-- AACR-NCI-EORTC meeting in Philadelphia, PA, November 17, 2005 Phase 2 Trial of GVAX(R) Vaccine for Pancreatic Cancer -- American Society of Hematology (ASH) meeting in Atlanta, GA, December 12, 2005 Phase 2 Trial of GVAX(R) Leukemia Vaccine in Chronic Myelogenous Leukemia

In other news, Cell Genesys confirmed that it will announce financial results for the third quarter 2005 after the markets close on Wednesday, November 2, 2005, and will hold a webcast teleconference on Thursday, November 3, 2005 at 8:30 a.m. PT. Stephen A. Sherwin, M.D., chairman and chief executive officer, and Sharon E. Tetlow, chief financial officer of Cell Genesys, will review financial results and events from the third quarter.

The live audio webcast will be available on the investor relations section of the company’s website, www.cellgenesys.com. If you are unable to listen to the live webcast, the call will be archived on the website for at least 48 hours following the call. To access the replay, go to the Investor Relations section of the website.

Cell Genesys is focused on the development and commercialization of novel biological therapies for patients with cancer. The company is currently pursuing two clinical stage product platforms -- GVAX(R) cancer vaccines and oncolytic virus therapies. Ongoing clinical trials include Phase 3 trials of GVAX(R) vaccine for prostate cancer, Phase 2 trials of GVAX(R) vaccines for leukemia and pancreatic cancer, and a Phase 1 trial of CG0070 oncolytic virus therapy for bladder cancer and potentially other types of cancer. Cell Genesys continues to hold equity interests in its two former subsidiaries -- Abgenix, Inc., an antibody products company and Ceregene, Inc., which is developing gene therapies for neurodegenerative disorders. Cell Genesys is headquartered in South San Francisco, CA and has its principal manufacturing operation in Hayward, CA. For additional information, please visit the company’s website at www.cellgenesys.com.

Statements made herein about the company, other than statements of historical fact, including statements about the company’s progress, results and timing of clinical trials and preclinical programs and the nature of product pipelines are forward-looking statements and are subject to a number of uncertainties that could cause actual results to differ materially from the statements made, including risks associated with the success of clinical trials and research and development programs, the regulatory approval process for clinical trials, competitive technologies and products, patents, continuation of corporate partnerships and the need for additional financings. For information about these and other risks which may affect Cell Genesys, please see the company’s Annual Report on Form 10-K for the year ended December 31, 2004 dated March 14, 2005 as well as Cell Genesys’ reports on Form 10-Q and 8-K and other reports filed from time to time with the Securities and Exchange Commission. The company assumes no obligation to update the forward-looking information in this press release.

CONTACT: Ina Cu Investor Relations 650-266-3200

Cell Genesys, Inc.

CONTACT: Ina Cu, Investor Relations, of Cell Genesys, Inc.,+1-650-266-3200

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