Objective:To investigate the outcome after laparoscopic radical surgery for colorectal cancer in patients over 80 years of age with preoperative combined type 2 diabetes (T2DM).Methods:Clinical data of 919 patients who underwent colorectal cancer laparoscopic resection surgery in Shaanxi Provincial People′s Hospital from January 2015 to January 2019 were retrospectively analyzed. The propensity score matching (PSM) method was used for 1∶1 matching of gender, ASA score, preoperative serum albumin level, body mass index(BMI), preoperative haemoglobin level, clinical tumour pathology TNM staging, tumour location, other medical comorbidities and history of abdominal surgery and finally group of 104 elderly diabetic patients aged ≥80 years with combined T2DM were successfully matched with another 104 non-elderly non-diabetic patients <80 years without combined diabetes group. (1) To compare the differences in operating time, intraoperative bleeding, number of intraoperative blood transfusions, number of lymph nodes dissected, number of ICU treatments, postoperative time to exhaustion and postoperative hospital stay, and postoperative adjuvant chemotherapy between the two groups after matching. (2)To observe the difference in major postoperative complications between the two groups. (3) Patients in both groups were observed for three years post-operative survival rate during the follow-up period. SPSS 25.0 statistical software was used for data analysis. The survival analysis was carried aut by the Kaplan-Meier curve method in parallel and the Log-Rank test.Results:Both groups were balanced in terms of baseline variable after PSM ( P>0.05). There was no difference between the two groups in terms of operative time, intraoperative bleeding, number of intraoperative blood transfusions, number of lymph nodes dissected, or time to postoperative evacuation ( P>0.05). There was a statistically significant difference between two groups in the number of people admitted to the ICU for treatment ( χ2=4.04, P=0.042), and ≥80 years diabetic group was higher. The difference in the incidence of postoperative complications between the two groups was not statistically significant [34.6% (36/104) vs 25.0% (26/104), χ2=2.30, P=0.130]; according to the Clavien-Dindo classification of postoperative complications, the incidence of Clavien-Dindo grade Ⅲ complications in the group ≥80 years with diabetes mellitus were was higher than that in the group <80 years without diabetes [12.5% (13/104) vs 4.8% (5/104), χ2=3.89, P=0.049]. For local surgical complications, the incidence of postoperative anastomotic leak was significantly higher in the ≥80 years diabetic group than in the <80 years non-diabetic group ( χ2=4.70, P=0.030), and the incidence of postoperative wound infection was no statistical significance in the two group. For non-surgical local complications, there was a statistically significant difference in pulmonary infection in the ≥80 years diabetic group compared to the <80 non-diabetic group ( χ2=4.68, P=0.031) and in acute coronary syndrome ( χ2=4.02, P=0.045). Compared with the <80 years non-diabetic group, patients in the ≥80 years diabetic group had significantly longer postoperative hospital stay [(13.3±4.4)d vs (9.2±3.2) d, t=3.41, P=0.019]. The difference in adjuvant chemotherapy after surgery between the two groups was not statistically significant (67.3% vs 76.0%, χ2=1.92, P=0.166). The survival rate at 3 years after surgery was not statistically significant in both groups [68.9% vs 74.2%, χ2=4.34, P=0.085]. Conclusions:The short-term and long-term outcomes of colorectal cancer in advanced age with type 2 diabetes are satisfactory. Adequate preoperative assessment of the patient's physical condition should be carried out, close intraoperative control of blood glucose, and close postoperative monitoring and regulation of blood glucose should be performed, except for patients with severe comorbidities and coexisting diseases that cannot tolerate surgery and advanced tumours that have lost their surgical significance.

Objective:To identify the risk factors for postoperative early complications of low rectal cancer treated with intersphincteric resection (ISR).Methods:The perioperative data of 82 patients with low rectal cancer undergoing ISR at the General Surgery Department of Shaanxi Provincial People's Hospital between Jan 2017 to Dec 2021 were retrospectively analyzed. Univariate, Logistic regression and multivariate analysis were used to analyze the risk factors for early complications after ISR, and a nomogram prediction model was drawn. Predictive models are validated.Results:There were 22 patients (27%) with complications. Univariate analysis showed that early complications were related to diabetes (0.021), serum albumin (<0.001), nutritional prognosis index (0.003), neoadjuvant chemoradiotherapy (<0.001), and operation time (<0.001). By multivariate analysis, diabetes ( OR=4.853, 95% CI: 1.059-22.241, P=0.042), low serum albumin ( OR=0.672, 95% CI: 0.468-0.966, P=0.032), neoadjuvant chemoradiotherapy ( OR=4.482, 95% CI: 1.117-17.979, P=0.034) and longer operation time ( OR=1.015, 95% CI: 1.001-1.029, P=0.037) were independent risk factors A nomogram prediction model was thus constructed, and the area under the curve of the nomogram prediction model was 0.888 (95% CI: 0.812-0.965). Conclusion:Diabetes mellitus, low serum albumin, neoadjuvant chemoradiotherapy, and longer operation time are independent risk factors of early postoperative complications for low rectal cancer undergoing ISR.