[1] Sun Yat Sen Univ, Canc Ctr, State Key Lab Oncol Southern China, Guangzhou 510060, Guangdong, Peoples R China
[2] Sun Yat Sen Univ, Canc Ctr, Dept Med Oncol, 651 Dong Feng Rd East, Guangzhou 510060, Guangdong, Peoples R China
[3] Peking Univ, Sch Oncol, Beijing 100142, Peoples R China
[4] Beijing Inst Canc Res, Dept GI Oncol, Beijing 100142, Peoples R China
[5] Sun Yat Sen Univ, Canc Ctr, Natl Clin Study Ctr Anticanc Drugs, Guangzhou 510060, Guangdong, Peoples R China