Fig. 3: Subgroup analyses.

a Subgroup analyses of overall survival according to the clinicopathological characteristics of the patients (n = 662). Data are plotted as HR value (red squares) with the corresponding two-sided 95% CI (error bars) based on the Cox regression method. b, c Kaplan–Meier estimates of overall survival (b) and disease-free survival (c) in stage N1 patients by treatment group. Log-rank test was used to compare both curves. EIPL extensive intraoperative peritoneal lavage, OS overall survival, HR hazard ratio, 95% CI 95% confidence interval, BMI body mass index.