According to a nationwide study published on May 29, 2026, in the journal Gastric Cancer, robotic gastrectomy delivers tangible clinical advantages over conventional laparoscopic surgery for gastric cancer patients, despite requiring longer operating times. Led by Professor Susumu Shibasaki from Fujita Health University–Okazaki Medical Center, researchers analyzed data from Japan’s National Clinical Database to determine whether robotic platforms provide meaningful benefits in routine clinical practice following national insurance coverage expansion in 2018.
Comparing Robotic and Laparoscopic Gastrectomy Outcomes in Japan
To evaluate the two surgical approaches, researchers utilized propensity score matching to compare 9,743 matched pairs of robotic and laparoscopic distal gastrectomy (DG) cases alongside 1,617 matched pairs of robotic and laparoscopic total gastrectomy (TG) cases performed between January 2023 and December 2024. According to data analyzed by Professor Shibasaki and collaborating institutions, robotic surgery consistently demanded more operating room time than laparoscopy. Robotic distal gastrectomy took roughly 50 minutes longer than the laparoscopic equivalent, while robotic total gastrectomy required nearly 70 additional minutes.
Despite the time penalty, the registry analysis revealed several distinct perioperative advantages for the robotic approach. Across both distal and total gastrectomy cohorts, robotic surgery achieved 33–40% less blood loss and a 50–65% reduction in the likelihood of conversion to open surgery. Furthermore, patients undergoing robotic procedures experienced shorter postoperative hospital stays compared to those treated with conventional laparoscopy. Among distal gastrectomy patients specifically, the robotic technique also lowered the incidence of serious postoperative complications and intra-abdominal infections.
Did You Know?
Robotic surgery systems use articulated instruments and high-definition three-dimensional visualization to help filter natural hand tremors, allowing surgeons greater dexterity during complex lymph-node dissections around the stomach.
Technical Demands of Total Versus Distal Gastrectomy
The clinical benefits of robotic systems did not distribute evenly across every type of operation. While robotic distal gastrectomy significantly reduced major postoperative complications, robotic total gastrectomy did not demonstrate a statistically significant improvement in this primary metric over laparoscopic methods. According to the research team, total gastrectomy remains a technically demanding procedure performed less frequently by surgeons, which limits opportunities to build experience with robotic techniques.
Professor Shibasaki noted that these contemporary findings reflect ongoing improvements in robotic technology, broader surgical experience, and expanded training opportunities across Japan since an earlier nationwide study conducted prior to the 2018 insurance coverage approval. Researchers suggest that these accumulated advancements allow robotic platforms to achieve a level of minimal invasiveness that builds upon the successes of standard laparoscopic surgery.
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Frequently Asked Questions
What are the main clinical benefits of robotic gastrectomy over laparoscopy?
According to data published in Gastric Cancer, robotic gastrectomy is associated with 33–40% less blood loss, a 50–65% lower rate of conversion to open surgery, and shorter postoperative hospital stays.
Why does robotic surgery take longer than laparoscopic surgery?
The study found that robotic procedures require more operating time, averaging about 50 minutes longer for distal gastrectomy and nearly 70 additional minutes for total gastrectomy compared to conventional laparoscopic methods.
Did robotic total gastrectomy reduce major complications?
Who led the nationwide study on robotic gastrectomy?
The study was led by Professor Susumu Shibasaki from the Department of Surgery, Fujita Health University–Okazaki Medical Center, Japan, together with Dr. Koichi Suda from Fujita Health University, Dr. Hideki Endo from the University of Tokyo, Dr. Ken Shirabe from Gunma University, and colleagues, with the support of the Japanese Gastric Cancer Association.
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