[1] Vall dHebron Inst Oncol, Barcelona, Spain
[2] Vall dHebron Univ Hosp, Barcelona, Spain
[3] Inst Oncol, Barcelona, Spain
[4] Natl Canc Ctr Hosp East, Dept Gastrointestinal Oncol, Kashiwa, Chiba, Japan
[5] Natl Canc Ctr Hosp East, Kashiwa, Chiba, Japan
[6] Omsk Reg Clin Ctr Oncol, Omsk, Russia
[7] Christie NHS, Manchester, Lancs, England
[8] UCL, Ctr Canc, Sarah Cannon Res Inst, London, England
[9] Minsk City Clin Oncol Dispensary, Minsk, BELARUS
[10] ASST Cremona, Oncol Unit, Cremona, Italy
[11] IPO Porto, Porto, Portugal
[12] NN Blokhin Russian Canc Res Ctr, Moscow, Russia
[13] NN Alexandrov Natl Canc Ctr Belarus, Minsk, BELARUS
[14] Osaka Natl Hosp, Osaka, Japan
[15] Toyama Univ, Dept Internal Med 3, Toyama, Japan
[16] Hacettepe Univ, Inst Canc, Dept Med Oncol, Ankara, Turkey
[17] Univ Hosp Gasthuisberg, Leuven, Belgium
[18] Katholieke Univ Leuven, Leuven, Belgium
[19] Inst Rech Int Servier, Suresnes, France
[20] Global Market Access, Paris, France
[21] Mem Sloan Kettering Canc Ctr, 1275 York Ave, New York, NY 10021 USA