Lymph node metastasis (N2 and N3 both P <0.001), TNM Staging (Stage III P <0.001; Stage IV P = 0.002), histological grade (G1+G2 versus G3, P = 0.004), HCT (P <0.001) and Hb (P = 0.025) were associated with OS. The gene discussed is GSTM1; the disease is metastatic malignant neoplasm in the lymph nodes.