[1] Mem Sloan Kettering Canc Ctr, Dept Med, New York, NY USA
[2] Yale Sch Med, Med Oncol, New Haven, CT USA
[3] Natl Canc Ctr Hosp East, Dept Gastrointestinal Oncol, Kashiwa, Chiba, Japan
[4] Dana Farber Canc Inst, Gastrointestinal Canc Ctr, Boston, MA 02115 USA
[5] Harvard Med Sch, Boston, MA 02115 USA
[6] Univ Calif Los Angeles, David Geffen Sch Med, Med Hematol & Oncol, Los Angeles, CA 90095 USA
[7] Univ Chicago, Med Ctr, Dept Med, Chicago, IL 60637 USA
[8] Royal Marsden NHS Fdn Trust, Royal Marsden Sutton, Dept Med, Sutton, Surrey, England
[9] Osaka Univ, Dept Frontier Sci Canc & Chemotherapy, Grad Sch Med, Osaka, Japan
[10] Sungkyunkwan Univ, Div Hematol Oncol, Dept Med, Samsung Med Ctr,Sch Med, Seoul, South Korea
[11] Merck & Co Inc, Med Oncol, Kenilworth, NJ USA