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About

Dr. Manabu Shiozawa is a leading colorectal surgeon whose research focuses on advancing minimally invasive techniques for rectal cancer, with a particular emphasis on preserving patient quality of life. His major contributions center on refining robotic and laparoscopic approaches to total mesorectal excision, including a widely cited seven-step dissection technique (2019) that standardizes robotic surgery for complex cases. Dr. Shiozawa has been instrumental in investigating postoperative functional outcomes, most notably through the landmark LANDMARC study (2024), which prospectively examined male sexual dysfunction—including erectile and ejaculatory dysfunction—following laparoscopic, robotic, and transanal rectal cancer surgery. His work also demonstrates the benefits of robotic-assisted surgery for technically demanding rectal cancers (2020) and shows that minimally invasive laparoscopy can reduce local recurrence in low rectal cancer (2021). Demonstrating remarkable innovation, Dr. Shiozawa has explored the use of handheld Raman spectroscopy for automated, non-invasive identification of pelvic autonomic nerves during colorectal surgery (2021), a pioneering step toward nerve-sparing procedures that could significantly reduce postoperative urinary and sexual dysfunction. With cumulative citations exceeding 30 across his most impactful papers, Dr. Shiozawa’s research is shaping the future of functional-preserving colorectal oncology.