Comparison of the results of superoxide dismutase (SOD), glutathione peroxidase (GPx), glutathione reductase (GR), glutathione-S-transferase (GST) enzyme activities and the level of reduced glutathione (GSH) of the patients A, B with patients with oral cancer in other studies and control group. The gene discussed is SOD1; the disease is lip and oral cavity carcinoma.