SAN FRANCISCO--(BUSINESS WIRE)--Sept. 7, 2006--Cell Genesys, Inc. (NASDAQ:CEGE) announced today that it is selling 5,750,000 shares of its common stock pursuant to an effective shelf registration statement. Cell Genesys expects the net proceeds from the sale of the shares to be approximately $25 million after deducting fees and expenses. Cell Genesys also granted to the underwriter a 30-day option to purchase up to an additional 862,500 shares of common stock. All of the shares in the offering are being sold by Cell Genesys. Credit Suisse Securities (USA) LLC is acting as sole underwriter for the offering. Cell Genesys expects the closing of the offering to occur on or about September 13, 2006, subject to customary closing conditions.