GSTM2 and malignant colon neoplasm: We also performed univariate and multivariate Cox regression analyses of GSTM2 protein expression and clinical characteristics, and the results showed that the p value of GSTM2 protein level in infiltrating lymphocytes within tumor tissues was less than 0.05, which indicated that GSTM2 was potentially an independent prognosis factor for colon cancer (Table 2).