Monday, Nov 24, 2003

Genentech Announces December 7th Webcast Discussion of Data Presented at ASH

South San Francisco, Calif. -- November 24, 2003 --

Genentech, Inc. (NYSE:DNA) invites investors, the media and the general public to listen to a webcast discussing data presented at the American Society of Hematology (ASH). The webcast will begin at 7:00 p.m. Pacific Time on December 7, 2003. The live webcast can be accessed by going to Genentech's website at http://www.gene.com and will be archived and available for replay until 10:00 p.m. Pacific Time on December 14, 2003.

An audio replay of the webcast will be available beginning at 10:00 p.m. Pacific Time on December 7, 2003 and ending at 10:00 p.m. Pacific Time on December 14, 2003. Access telephone numbers for this replay are: 1-800-642-1687 (U.S./Canada) and 1-706-645-9291(international); passcode number is 4032920.

Genentech is a leading biotechnology company that discovers, develops, manufactures and commercializes biotherapeutics for significant unmet medical needs. Sixteen of the currently approved biotechnology products originated from or are based on Genentech science. Genentech manufactures and commercializes 12 biotechnology products directly in the United States. The company has headquarters in South San Francisco, California and is traded on the New York Stock Exchange under the symbol DNA. For press releases and additional information about the company, please visit http://www.gene.com.