1. Department of General Surgery, Beijing Friendship Hospital, Capital Medical University; Beijing Key Laboratory of Cancer Invasion and Metastasis Research and National Clinical Research Center for Digestive Diseases, Beijing 100050, China
2. San Valley Biotechnology Incorporated, Beijing 100094, China
3. Departments of Molecular Microbiology and Immunology and Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, CA, U.S.A.