Within the univariate analysis of OS, poorer tumor differentiation (p = 0.015), advanced AJCC T stage (p = 0.031), higher AJCC TNM stage (p < 0.001), aggressive lymph node metastasis (p < 0.001), aggressive nerve invasion (p = 0.015), and higher DHX9 expression (p = 0.001) were considered as significant risk factors. Here, DHX9 is linked to metastatic malignant neoplasm in the lymph nodes.