Furthermore, in the multivariate Cox proportional hazards regression model that included gender, age, stage, histological grade, Lauren’s classification, perineural invasion, lymphatic/venous invasion, ulcer findings, tumor location and HER2 level, HER2 level retained the significant association with DFS (HR: 32.6, 95% CI 2.53–419.64, p = 0.008) (Table S2). This evidence concerns the gene ERBB2 and neoplasm.