1. Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Gastrointestinal Cancer Center, Ward I, Peking University Cancer Hospital & Institute, Beijing, P.R. China
2. Department of Radiation Oncology, Peking University 3rd Hospital, Beijing, P.R. China
3. Department of Pathology, Peking University Cancer Hospital & Institute, Beijing, P.R. China
4. Department of Radiology, Peking University Cancer Hospital & Institute, Beijing, P.R. China
5. Biological Sample Bank, Peking University Cancer Hospital & Institute, Beijing, P.R. China