Kun Yang1, Wei-Han Zhang1, Xin-Zu Chen1, Jian-Kun Hu2. 1. Department of Gastrointestinal Surgery, West China Hospital, Sichuan University, Sichuan Province, China; Laboratory of Gastric Cancer, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Sichuan Province, China. 2. Department of Gastrointestinal Surgery, West China Hospital, Sichuan University, Sichuan Province, China; Laboratory of Gastric Cancer, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Sichuan Province, China. Electronic address: hujkwch@126.com.