Surgical Oncology
MD, PhD, Professor, Department of Surgical Oncology, The University of Tokyo, Tokyo, Japan.
Dr. Soichiro Ishihara is the Professor of the Department of Surgical Oncology, The University of Tokyo, and the chief of the Department of Colorectal Surgery and Vascular Surgery of the University Hospital. He graduated from the University of Tokyo School of Medicine in 1992, and obtained Ph.D. in Surgery, The University of Tokyo Graduate School of Medicine in 2001. Before he came back to The University of Tokyo as a professor in 2018, he was the Professor of the Department of Digestive Surgery, The International University of Health and Welfare.
He is the author of more than 340 scientific papers published in peer-reviewed journals, and is the editor-in-chief of the Journal of the Anus, Colon and Rectum, and a member of the editorial board of Diseases of the Colon & Rectum, and Surgery Today.
He is a member of the committees of the Japanese Society for Cancer of the Colon and Rectum (JSCCR) Guidelines for the Treatment of Colorectal Cancer, and the Clinical Practice Guidelines for Peritoneal Malignancy. He is also the chairman of the JSCCR task force appointed to develop guidelines for the treatment of inflammatory bowel diseases (IBD) -associated intestinal cancers.
His main professional and scientific interests focus on surgical oncology, colorectal surgery, and minimally invasive surgery including laparoscopic and robotic surgeries. He is also specialized in IBD, especially of diagnosis and surgical treatment of IBD-associated intestinal cancers.
Selected publications from PubMed
Sex-Based Body Composition Changes in Patients With Rectal Cancer Undergoing Preoperative Chemoradiotherapy: A Prospective Observational Study.
Abe S, Nozawa H, Abe K, Yokota Y, Hori S, Taguchi Y, Yakabe M, Sasaki K, Ogawa S, Ishihara S
Ann Gastroenterol Surg. 2026 Sep;10(5):1553-1562 doi: 10.1002/ags3.70231.
Clinicopathological features and cancer-specific survival in young patients with ulcerative colitis-associated colorectal neoplasia: a nationwide cohort study in Japan.
Shinagawa T, Komatsu K, Uchino M, Ikeuchi H, Shigeta K, Oka S, Higashi D, Ogawa S, Watanabe K, Shibutani M, Okita Y, Wakai T, Mizuuchi Y, Okamoto K, Yamada K, Sato Y, Ogino T, Kimura H, Takahashi K, Hida K, Kinugasa Y, Ishida F, Okuda J, Daito K, Yamamoto T, Yamamoto S, Koyama F, Hiro J, Komori K, Shida D, Arakaki J, Fujita F, Matsuyama T, Ueno H, Ochiai H, Maemoto A, Nezu R, Sasaki S, Sunami E, Noguchi T, Sugihara K, Ajioka Y, Ishihara S, Study Group for Inflammatory Bowel Disease Associated Intestinal Cancers by Japanese Society for Cancer of the Colon and Rectum
Inflamm Bowel Dis. 2026 Sep 1;32(9):1750-1759 doi: 10.1093/ibd/izag069.
Clinically meaningful risk factors for recurrence in T1 colorectal cancer treated with endoscopic resection alone identified by unsupervised machine learning: a multicenter study.
Zhou X, Togashi K, Zhu X, Kajiwara Y, Oka S, Tanaka S, Takamatsu M, Hotta K, Yamada M, Ikematsu H, Nagata S, Yamada K, Hashimoto K, Ishihara S, Saitoh Y, Matsuda K, Komori K, Ishiguro M, Tamaru Y, Okuyama T, Minami S, Ohnuma S, Sakamoto K, Sugihara K, Ueno H
Endoscopy. 2026 Aug 12 doi: 10.1055/a-2917-8805.
Correction: How do Japanese medical students use social media? A large multicenter survey of platform preferences and career decision-making.
Yamamoto T, Hida K, Ishihara S, Murakami S, Yamane Y, Kinjo T, Kinoshita M, Horimukai K, Otsuka A, Takami H, Obama K
Surg Today. 2026 Oct;56(10):2201 doi: 10.1007/s00595-026-03464-0.
Analysis of retrograde infection of prophylactic pelvic drains in rectal cancer surgery: a retrospective cohort study.
Nagai Y, Nozawa H, Sasaki K, Murono K, Emoto S, Kaneko K, Yokoyama Y, Abe S, Harada Y, Shinagawa T, Tachikawa Y, Ishihara S
Surg Today. 2026 Aug;56(8):1608-1616 doi: 10.1007/s00595-026-03273-5.
In recent years, the debate between upfront surgery and neoadjuvant therapy has become a cornerstone in the management of rectal cancer. Choosing the optimal path requires a deep understanding of varying international guidelines and the precision offered by modern surgical techniques. Thanks to the integration of laparoscopic and robotic-assisted systems, surgeons can now achieve higher levels of precision in Local Axial Resection (LAR), adhering to rigorous clinical standards to improve patient quality of life.
With Johnson & Johnson MedTech
Published
Feb 2026
With Japan Society For Endoscopic Surgery
Published
Apr 2022
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