SOUTH SAN FRANCISCO, Calif.--(BUSINESS WIRE)--Exelixis, Inc. (NASDAQ:EXEL) announced today that it will hold an investor briefing webcast in conjunction with the American Society of Clinical Oncology (ASCO) 2011 Genitourinary Cancers Symposium. The webcast will be held on Thursday, February 17, 2011, from 6:30-8:00 p.m. EST, and may be accessed by visiting the Event Calendar page under Investors at http://www.exelixis.com.