[1] Dana Farber Canc Inst, Boston, MA 02115 USA
[2] Inst Gustave Roussy, Dept Med Oncol, Villejuif, France
[3] Queen Mary Univ, Barts Canc Inst, London, England
[4] Northwestern Univ, Dept Med Social Sci, Feinberg Sch Med, Chicago, IL 60611 USA
[5] Exelixis Inc, San Francisco, CA USA
[6] Mem Sloan Kettering Canc Ctr, New York, NY 10021 USA