[1] Chinese Acad Sci, Canc Hosp, Beijing, Peoples R China
[2] Yonsei Canc Ctr, Dept Internal Med, Seoul, South Korea
[3] Seoul Natl Univ Hosp, Seoul 110744, South Korea
[4] Beijing Canc Hosp, Beijing, Peoples R China
[5] Chiba Canc Ctr, Chiba 2608717, Japan
[6] Nanjing Bayi Hosp, PLA Canc Ctr, Dept Med Oncol, Nanjing, Peoples R China
[7] Kyushu Univ Hosp, Fukuoka 812, Japan
[8] Pfizer Inc, Cambridge, MA USA
[9] Pfizer Inc, Tokyo, Japan
[10] Tsukuba Univ Hosp, Tsukuba, Ibaraki, Japan