Friday, May 23, 2003

Genentech Announces June 1st Webcast Discussion of Data Presented at ASCO

South San Francisco, Calif. -- May 23, 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 Clinical Oncology (ASCO). The webcast will begin at 4:00pm Pacific Time on June 1, 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 7:00pm Pacific Time on June 8, 2003.

An audio replay of the webcast will be available beginning at 7:00pm Pacific Time on June 1, 2003 and ending at 7:00pm Pacific Time on June 8, 2003. Access telephone numbers for this replay are: 1-800-642-1687 (U.S./Canada) and 1-706-645-9291(international); passcode number is 713041.

Genentech is a leading biotechnology company that discovers, develops, manufactures and commercializes biotherapeutics for significant unmet medical needs. Fifteen of the currently approved biotechnology products originated from or are based on Genentech science. Genentech manufactures and commercializes ten 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.