SNAI1 and metastatic malignant neoplasm in the lymph nodes: Multivariate analysis using the Cox's proportional hazards model revealed that local regional recurrence and co-overexpression of Snail and Slug pattern were independent and significant prognostic factors in overall survival of all patients (p = 0.004, p = 0.012, respectively, Supplementary Table S2), and local regional recurrence and lymph node metastasis, and co-overexpression of Snail and Slug pattern were independent and significant prognostic factors in disease-free survival of all patients (p < 0.001, p = 0.014, p < 0.001, respectively, Supplementary Table S2).