After adjusting for these variables, KIBRA expression and lymph node metastasis were found to be independent prognostic factors for EFS (KIBRA, p = 0.004, HR = 3.952, 95% CI = 1.542–10.133; lymph node metastasis, p < 0.001, HR = 6.597, 95% CI, 2.786–15.623) (Table 3). This evidence concerns the gene WWC1 and metastatic malignant neoplasm in the lymph nodes.