Chief Physician, Department of Gastrointestinal Medical Oncology, Peking University Cancer Hospital Executive Director, Department of Hepatobiliary Oncology, Beijing Tsinghua Changgung Hospital Vice Chairman, CSCO Biliary Tract Tumor Expert Committee Standing Committee Member, CSCO Pancreatic Cancer Expert Committee Member, CSCO Liver Cancer Expert Committee Vice President, Tumor Branch of Chinese Geriatrics Society Chairman, Beijing Clinical Research Committee for Hepatobiliary and Pancreatic Cancer Prevention Vice Chairman, Youth Committee of Gastrointestinal Tumor Special Committee, Chinese Research Hospital Association Member, Precision Medicine and Tumor MDT Professional Committee, Chinese Research Hospital Association Member, Tumor Immunotherapy Branch of China International Exchange and Promotive Association for Medical and Health Care Member, Hepatobiliary and Pancreatic Young and Middle-aged Expert Committee, Beijing Health Promotion Association