1. Department of Medical Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
2. Laboratory of Molecular Targeted Therapy in Oncology, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
3. Department of Radiology, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
4. State Key Laboratory of Cancer Biology and Xijing Hospital of Digest Diseases, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China