GSTM1 and neoplasm: Among the three groups, no statistical significance (P > 0.05) was found for postoperative tumour characteristics and preoperative characteristics, which include the following: gender; age; counts of WBC, RBC, Hb, and PLT; and levels of ALT, AST, ALP, tumour markers (AFP, CA199, and CEA), and hepatitis B virus markers.