The univariate analysis showed that patients’ T classification, pathologic grade, local regional recurrence, lymph node metastasis, Snail or Slug expression and co-overexpression of Snail and Slug were significantly associated with patient overall and disease-free survival (p < 0.05, Supplementary Table S1). This evidence concerns the gene SNAI2 and metastatic malignant neoplasm in the lymph nodes.