Sun Yat Sen Univ, Ctr Canc, Guangzhou 510275, Guangdong, Peoples R China; Chinese Acad Med Sci, Canc Inst & Hosp, Beijing 100730, Peoples R China; Sichuan Canc Hosp, Chengdu, Peoples R China; Fujian Canc Hosp, Fuzhou, Peoples R China; Fudan Univ, Ctr Canc, Shanghai 200433, Peoples R China; Guizhou Canc Hosp, Guiyang, Peoples R China; Guangxi Med Univ, Affiliated Hosp 1, Nanning, Peoples R China; Wuhan Univ, Hubei Canc Clin Study Ctr, Wuhan 430072, Peoples R China; Wuhan Univ, Zhongnan Hosp, Wuhan 430072, Peoples R China; Sun Yat Sen Univ, Ctr Canc, Dept Med Oncol, Guangzhou 510275, Guangdong, Peoples R China