[1] Yonsei Univ, Yonsei Canc Ctr, Coll Med, Seoul, South Korea
[2] Seoul Natl Univ, Coll Med, Seoul, South Korea
[3] Yale Canc Ctr, New Haven, CT USA
[4] Canc Ctr Peoples Liberat Army, Nanjing, Jiangsu, Peoples R China
[5] Osaka Univ, Grad Sch Med, Dept Frontier Sci Canc & Chemotherapy, Suita, Osaka, Japan
[6] Natl Canc Ctr, Kashiwa, Chiba, Japan
[7] Vall dHebron Univ Hosp, Barcelona, Spain
[8] Inst Oncol VHIO, Barcelona, Spain
[9] Univ Hosp Gasthuisberg, Leuven, Belgium
[10] Katholieke Univ Leuven, Leuven, Belgium
[11] Merck & Co Inc, Kenilworth, NJ USA
[12] Mem Sloan Kettering Canc Ctr, 1275 York Ave, New York, NY 10021 USA