Associate Chief Physician, specializing in oncological medical diagnosis and treatment. Professional Expertise: Diagnosis and treatment of malignant tumors of the digestive system, including esophageal cancer, gastric cancer, colorectal cancer, pancreatic cancer, biliary tract tumors, small intestinal cancer, liver cancer, gastrointestinal stromal tumors, and neuroendocrine tumors. Professional Affiliations: Member of the Esophageal Cancer Professional Committee of the Beijing Anti-Cancer Association, Member of the Tumor Microenvironment Subcommittee of the Beijing Cancer Prevention and Treatment Research Association, Visiting Scholar at the National Cancer Center Japan, Tokyo. Published articles include: (1) Jun Jia, Jing Yu, Zhiwei Sun, Ying Yang, Chuanling Liu, Yanjie Xiao, Xiaodong Zhang. Phase 1 dose-escalation study of apatinib and irinotecan in esophageal squamous cell carcinoma patients. Translational Cancer Research, 2021, 10(2): 627-636. (2) Wang Fang, Jia Jun, Yang Ying, Yu Jing, Sun Zhiwei, Liu Chuanling, Xiao Yanjie, Du Feng, Shi Youwu, Zhang Xiaodong. Relationship between lymph node metastasis rate and prognosis and postoperative adjuvant chemotherapy after radical resection of esophageal squamous cell carcinoma. Chinese Journal of Digestive Surgery, 2019, 18(6): 549-555. (3) J Jia, Y Cui, M Lu, X Wang, Jie Li, Jian Li, Y Li, X Zhang, J Gao, J Zhou, Z Lu, J Gong, J Yu, Z Sun, C Liu, L Shen, X Zhang. The relation of EGFR expression by immunohistochemical staining and clinical response of combination treatment of nimotuzumab and chemotherapy in esophageal squamous cell carcinoma. Clin Transl Oncol, 2016 Jun;18(6):592-598. (4) Zhiwei Sun, Xin Yang, Feng Du, Youwu Shi, Jing Sun, Jun Jia, Chuanling Liu, Yanjie Xiao, Jing Yu, Xiaodong Zhang, Ying Yang. Association between polymorphisms of ABCB1 and prognosis in esophageal squamous cell carcinoma patients treated with taxane. J Gene Med, 2022 Jul;24(7):e3434. (5) Sun Jing, Shi Youwu, Du Feng, Yang Ying, Sun Zhiwei, Yu Jing, Xiao Yanjie, Zhang Xiaodong, Jia Jun. Clinical analysis of immune-related adverse events in gastrointestinal tumors. Journal of Capital Medical University, 2023, 44(2): 343-350.