Abstract:Objective To explore the timing of endoscopic surgery for patients with colorectal cancer and high-risk adenoma.Methods 125 patients with colorectal cancer and high-risk adenoma from January 2016 to January 2021 were selected for endoscopic surgery according to the timing of surgery, it was divided into 64 cases in group A and 61 cases in group B. group A: Patients complete preoperative examinations before surgery, elective surgical colorectal cancer surgery after meeting the surgical indications, and elective endoscopic high-risk adenoma surgery 3~6 months after surgery; Group B: patients before surgery after completing the preoperative examination and meeting the surgical indications, elective endoscopic high-risk adenoma surgery will be performed; surgical colorectal cancer surgery will be performed within 2 weeks after surgery. A self-made questionnaire will be used to determine the patient’s age, gender, and surgical blood loss, operation time, high-risk adenoma location, size, number, etc. are recorded.Results There were no statistically significant differences between the two groups of patients in terms of age, gender, operation time, and intraoperative blood loss (P > 0.05); the two groups of patients were not statistically significant in terms of disease type, colorectal cancer lesion diameter, adenoma diameter. The tumor location and pathological type were not statistically significant (P > 0.05); 12 patients in group A (18.8%) were underwent secondary surgery, which was more than the 2 patients in group B (3.3%). The difference was significant statistical significance (P < 0.05). Multivariate Logistics analysis concluded that elective surgical colorectal cancer surgery and elective endoscopic high-risk adenoma surgery 3 ~ 6 months after surgery are independent risk factors for patients with secondary surgery (OR^ = 0.324, 95%CI: 2.65 ~ 7.41, P < 0.05).Conclusion In summary, patients with colorectal cancer with high-risk adenoma underwent surgical colorectal cancer surgery within 2 weeks after elective endoscopic high-risk adenoma surgery can reduce the incidence of secondary operations, reduce patients’ injury and improve prognosis.