GSTM1 and lung cancer: The impact of CYP1A1 m1, CYP1A1m2, GSTM1 and GSTT1 gene polymorphisms on superoxide dismutase activity (Table 9), Glutathione peroxidase activity (Table 10), MDA (Table 11) and 8-OHdG levels (Table 12) were assessed between controls and lung cancer patients.