 ASA (*P* = 0.000), tumor site (*P* = 0.000), tumor size (*P* \< 0.000), TNM stage (*P* \< 0.000), lymphovascular invasion (*P* = 0.000), perineural invasion (*P* \< 0.000), and postoperative chemotherapy (*P* = 0.000) all demonstrated a statistically significant association with DFS, whereas age, gender, Lauren type, and histological grade had no prognostic significance for D