In the analysis of RFS, poorer tumor differentiation (p = 0.013), higher AJCC TNM stage (p < 0.001), aggressive lymph node metastasis (p < 0.001), aggressive nerve invasion (p = 0.004), and higher DHX9 expression (p = 0.001) were identified as apparent risk factors by the univariate analysis, and nerve invasion (p = 0.031, HR = 2.656; 95% CI: 1.095–6.442) and DHX9 expression (p = 0.005, HR = 2.031; 95% CI: 1.238–3.333) were finally confirmed as independent risk factors for recurrence (Table 3). The gene discussed is DHX9; the disease is metastatic malignant neoplasm in the lymph nodes.