Research field (4):
Gastroenterology
, General surgery, pediatric surgery
, Metabolism and endocrinology
, Digestive surgery
Research keywords (3):
Metabolic surgery
, Bariatric surgery
, Gastrointestinal surgery
Research theme for competitive and other funds (3):
2022 - 2025 Mechanism of liver fibrosis progression in severely obese patients investigated by changes of bacterial flora and multiomics analysis
2020 - 2023 Analysis of nonalcoholic steatohepatistis with severe obesity end mechanism of improvement after surgery
2015 - 2018 Insulin resistance and hepatic histological changes after bariatric surgery for severe obesity with NASH
Papers (179):
Taku Kimura, Hiroyuki Nitta, Hirokatsu Katagiri, Shoji Kanno, Akira Umemura, Daiki Takeda, Taro Ando, Satoshi Amano, Toma Kawashima, Koji Kikuchi, et al. Effects of the Scopist's Skills on the Perioperative Outcomes of Laparoscopic Liver Resection. Asian journal of endoscopic surgery. 2025. 18. 1. e13413
Akira Umemura, Akira Sasaki, Hideki Kumagai, Yota Tanahashi, Takafumi Iwasaki, Hiroyuki Nitta. Relationships Between Changes in Serum Ketone Body Levels and Metabolic Effects in Patients with Severe Obesity Who Underwent Laparoscopic Sleeve Gastrectomy. Obesity surgery. 2024. 34. 7. 2607-2616
Masaki Kanno, Akira Umemura, Shigeaki Baba, Haruka Nikai, Ryo Sugimoto, Akira Sasaki. Gastric cancer after laparoscopic adjustable gastric banding: A case report. International journal of surgery case reports. 2024. 119. 109714-109714
Akira Umemura, Hiroyuki Nitta, Daiki Takeda, Hirokatsu Katagiri, Shoji Kanno, Akira Sasaki. Transthoracic transdiaphragmatic approach in laparoscopic liver resection for hepatocellular carcinoma in a patient with severe obesity and history of deceased donor liver transplantation. Asian journal of endoscopic surgery. 2024. 17. 2. e13305
Hideki Kumagai, Akira Sasaki, Akira Umemura, Keisuke Kakisaka, Takeshi Iwaya, Satoshi S Nishizuka. Effects of laparoscopic sleeve gastrectomy on nonalcoholic fatty liver disease and TGF-β signaling pathway. Endocrine journal. 2024. 71. 2. 139-152