SOUTH SAN FRANCISCO, Calif.--(BUSINESS WIRE)--Exelixis, Inc. (Nasdaq:EXEL) announced today that it will host its Annual R&D Day on Thursday, December 2, 2010 from 10:00 a.m. EST / 7:00 a.m. PST until 2:30 p.m. EST / 11:30 a.m. PST. Exelixis management will outline the development priorities for XL184, discuss the company’s corporate strategy, and provide a general business update.