Abstract:Objective To explore the learning curve of Da Vinci robotic surgical system in radical resection of colorectal cancer, analyze the clinical data and pathological data at different stages of learning curve and obtain the number of operations required to reach different learning curve stages. Methods The data of 65 cases of Da Vinci robot assisted laparoscopic radical resection of colorectal cancer implemented by the same surgical team in China-Japan Uion Hospital from July 2020 to October 2021 was analyzed retrospectively. CUSUM (Cumulative Sum) method was used to fit the learning curve. According to the different stages of learning curve trend, the learning curve of Da Vinci robot was divided into learning and exploration stage, proficiency stage and difficulty challenge stage. The relevant cases at different stages were analyzed to study the learning curve of Da Vinci robot in radical resection of colorectal cancer. Results All 65 patients underwent Da Vinci robot radical resection for colorectal cancer successfully. The median operation time was 130 min. The best curve-fitting equation was y=0.02x³-1.73x²+35.31x+39.72，(R²=0.956，P<0.05). The minimum number of operations reaching the learning curve was 11 cases. Conclusions The learning curve of Da Vinci robotic surgery can be divided into learning and exploration stage, proficiency stage and difficulty challenge stage. The minimum number of operations reaching proficiency stage of learning curve is 11 for the surgeons with rich experience in laparoscopic surgery, with a significantly reduced operative time and intraoperative blood loss.