1. Department of Medical Oncology, Lung Cancer and Gastrointestinal Unit, Hunan Cancer Hospital/The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan 410013, China
2. Department of Pathology, Immuno-Oncology Laboratory, School of Basic Medicine, Central South University, Changsha, Hunan 410013, China
3. Department of Medical Oncology, Qinghai Provincial People's Hospital, Xining, Qinghai 810000, China
4. Department of Medical Oncology, Graduate Collaborative Training Base of Hunan Cancer Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan 421001, China.