The applicant has been a member of the Division of Gastroenterology and General Surgery, Department of Surgery, Showa University School of Medicine, and has been engaged in research specializing in the field of hepatobiliary and pancreatic surgery. Research in the degree D. program at the Department of Pharmacology, Showa University Graduate School of Medicine from April 2011 to March 2018, and obtained his degree mainly through pharmacokinetic research using human and rat liver tissue. (Effect of Benifuuki Tea on Cytochrome P450-mediated Metabolic Activity in Rats T Hirai et al. In Vivo et al 2018; 32: 33-40: First author/refereed 2 others: Showa Univ J Med Sci 2012: co-author/Bio Pharm Bull. 2017: co-author). At that time, I learned the experimental procedures necessary for this study, such as RT-PCR, Western blotting, and ELISA. I also collected intraoperative liver, pancreas, and duodenum surgical specimens during this period, and have been involved in translational research in collaboration with basic research laboratories. Post-Degree Research (Hepatobiliary and Pancreatic Surgery) After obtaining his degree, he specialized in the field of hepatobiliary and pancreatic surgery. In this field, he conducted research on preoperative difficulty classification for laparoscopic cholecystectomy and reported that a simple classification system for the difficulty system developed in the department correlated with intraoperative findings and influenced postoperative outcomes. (A simple classification system for the difficulty of laparoscopic cholecystectomy/The 30 Japanese Society for Endoscopic Surgery ePoster Award/; under review). Next, a study on the diagnosis of liver resection margins using fluorescence microscopy (Pathological Validity of Using Near-infrared Fluorescence Imaging for Securing Surgical Margins During Liver Resection: Tashiro Y, Aoki T, Hirai T, et al Anticancer res 2020), the applicant performed most of the microscopy operations as a co-investigator, published papers as a co-author, and presented at national and international conferences (Digestive Disease Week 2018/United States), etc. In doing so, she received a scholarship from the Endoscopic Medical Research Foundation and a Showa University Academic Research Fellowship. Post-degree research (in the field of perioperative infection). Since 2014, I have been in charge of complication and infection control in the field of gastrointestinal surgery at our institution, and have conducted the following research. (A management protocol for successfully reducing Clostridioides Difficile infections at a Japanese university hospital's gastrointestinal surgery (A management protocol for successfully reducing Clostridioides Difficile infections at a Japanese university hospital's gastrointestinal surgery wards/under review), Research on extrapulmonary tuberculosis (Award of Excellence, 163rd Annual Meeting of the Japanese Society for Tuberculosis Kanto Branch/203rd Annual Meeting of the Japanese Respiratory Society Kanto Regional Meeting).