In multivariate analysis using Cox proportional hazards models, N1 stage (HR 2.786; 95% CI 1.617–4.800; P < 0.001), poor tumor differentiation (HR 1.969; 95% CI 1.107–3.500; P = 0.021), and high IQGAP1 expression (hazard ratio [HR] 1.880; 95% CI 1.049–3.367; P = 0.034) were correlated with OS (Supplementary Table S1). Here, IQGAP1 is linked to neoplasm.