The factors significantly associated with both cancer-specific survival (CSS) and relapse-free survival (RFS) in univariate survival analysis, were sex, age of patients, tumor size, tumor stage, lymph node metastasis, and immunohistochemical expressions of IL4Rα and IL13Rα1 (Table 2). This evidence concerns the gene IL13RA1 and metastatic malignant neoplasm in the lymph nodes.