Chief Physician, Professor, and Doctoral Supervisor. Dr. Jianchun Yu specializes in gastrointestinal surgery and nutrition metabolism. Her clinical and basic research focuses on parenteral and enteral nutrition, including the evaluation of gastric cancer, neoadjuvant chemotherapy and nutritional support, standardized radical gastrectomy for gastric cancer, parenteral and enteral nutrition support and surgical treatment for intestinal fistula, and radical surgery for thyroid cancer. She is highly experienced in minimally invasive laparoscopic surgery, such as gastroscopically controlled laparoscopic segmental cardia or pylorus-reservation gastrectomy for the treatment of gastric stromal tumors and early gastric cancer, laparoscopic gastric banding, laparoscopic sleeve gastrectomy, laparoscopic Nissen fundoplication, abdominal hernia laparoscopic repair, percutaneous endoscopic gastrostomy (PEG) / percutaneous endoscopic gastro-jejunal (PEG-J), and jejunal interposition. Born in 1962, Dr. Yu holds an MD and serves as a Chief Physician, Professor, and Doctoral Supervisor at the Chinese Academy of Medical Sciences and Peking Union Medical College. She has been dedicated to perioperative parenteral and enteral nutrition, gastrointestinal tumor chemotherapy and immunonutrition, tumor and nutritional immunity, parenteral and enteral nutrition and gastrointestinal motility research, nutritional screening and standardization for elderly patients, and the mechanism of metabolic changes related to weight loss and diabetes surgical treatment. She has led multiple national multi-center clinical studies and has undertaken over 10 major national and provincial scientific research projects, training 35 graduate students. She has published over 100 articles in domestic and international journals and served as editor-in-chief or co-editor for numerous professional books.