GSTM1 and metastatic malignant neoplasm in the lymph nodes: Univariate analysis demonstrated that tumor size (P = 0.036), lymph node metastasis (N2 and N3 both P<0.001), TNM Staging (Stage III and Stage IV both P <0.001), histological grade (G1+G2 versus G3, P = 0.003), HCT (P <0.001) and Hb (P = 0.022) were significantly associated with the DFS in our study cohort.