Surgical Oncology
MD, PhD, FACS, Professor and; Chairman, Department of Surgery, Surgical Oncology and Science, SAPPORO MEDICAL UNIVERSITY, Sapporo Japan
Prof. Ichiro Takemasa is the author of more than 300 scientific papers published in peer- reviewed impact factored scientific journals.
Prof. Takemasa is an executive director of the Japanese Society of Gastroenterological Surgery (JSGS) and Japan Society for Endoscopy Surgery (JSES). He is also the chair of the JSES Robotic-Assisted Surgery Steering Committee.
He was the first to perform single-incision lap surgery with D3 dissection for colorectal cancer, and is the KOL in MIS, including robot-assisted surgery, taTME, in Japan, and has served as PI for more than 20 clinical trials.
Selected publications from PubMed
Prognostic Impact of Circumferential Resection Margin in Minimally Invasive Surgery for Locally Advanced Rectal Cancer: A Multicenter Prospective Study.
Hamabe A, Ito M, Toda S, Suwa Y, Hasegawa S, Kotake M, Inomata M, Ueda K, Ogura A, Sugimoto K, Kimura K, Otsuka K, Noguchi T, Hida K, Hirano Y, Kawai K, Yamagishi S, Naitoh T, Takemasa I, Japan Society of Laparoscopic Colorectal Surgery
Ann Gastroenterol Surg. 2026 Aug 27 doi: 10.1002/ags3.70268.
Interaction Between Operator and Assistant Certification Is Associated With Local Recurrence After Laparoscopic Rectal Cancer Surgery: An Ancillary Analysis of the EnSSURE Study.
Sakimura Y, Bando H, Hida K, Fukuoka T, Funakoshi T, Teraishi F, Uehara K, Inoue Y, Suzuki N, Ichikawa N, Iijima H, Taketomi A, Sakai Y, Naitoh T, Takemasa I, EnSSURE study group collaboratives within the Japan Society of Laparoscopic Colorectal Surgery
Ann Gastroenterol Surg. 2026 Aug 12 doi: 10.1002/ags3.70265.
Real-time indocyanine green fluorescence imaging enhances the precision of lymph node dissection in laparoscopic colon cancer surgery: a propensity score-matched cohort study.
Sato Y, Miyo M, Ishii M, Miura R, Okuya K, Toyota M, Fujino H, Okamoto K, Takemasa I
Surg Endosc. 2026 Jul;40(7):5702-5712 doi: 10.1007/s00464-026-12647-2.
Evaluation of the prognostic impact of intraoperative cytology results according to tumor sidedness in stage II/III resectable colorectal cancer.
Usui A, Kobayashi H, Kotake K, Maeda K, Shuto T, Kawasaki M, Komori K, Ozawa H, Kosugi C, Ohue M, Funahashi K, Takemasa I, Ishida H, Kazama S, Shimada Y, Motohashi H, Kinugasa Y, Kanemitsu Y, Ochiai H, Ishihara S, Itabashi M, Sugihara K, Ueno H
Int J Colorectal Dis. 2026 Jun 15;41(1) doi: 10.1007/s00384-026-05173-z.
Safety and efficacy of a 12-mm trocar with integrated fascial closure for preventing port-site hernia in minimally invasive abdominal surgery: a multicenter prospective observational study among over weight patients with thick abdominal walls.
Ishii M, Okuya K, Miyo M, Miura R, Toyota M, Okamoto K, Akizuki E, Nishidate T, Ohshima H, Okita K, Takemasa I
Surg Endosc. 2026 Jan;40(1):291-299 doi: 10.1007/s00464-025-12295-y.
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