Statistical analyses were performed using JMP Pro version 12 statistical software (SAS Institute). Continuous variables were expressed as the median (range), and categorical variables as the number (percentage). Baseline characteristics and clinical outcomes were compared using Fisher's exact test for categorical variables, and the nonparametric Wilcoxon rank sum test for continuous variables. Disease-free survival time was calculated from surgery to the date of the last visit (up to 60 months) or to death. Disease-free survival was analyzed using Kaplan-Meier survival curves, and significant differences were determined using the log-rank test. In addition, we performed multivariate Cox regression analysis for Disease-free survival in terms of prognostic factors (initial treatment, age, sex, location, stage, number of lymph nodes resected, and adjuvant chemotherapy). The location was divided into left and right side, and the cutoff value for the number of lymph nodes was set up to 25. All P values were two-sided, and results with P<0.05 were considered significant.

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