RESUMO
BACKGROUND & OBJECTIVE: Overproduction of lipid peroxidation byproducts and disturbances in antioxidant defense system have been implicated in the pathogenesis of several diseases including oral cancer. Though several studies have been done on the level of lipid peroxidation and antioxidants in oral cancer patients, there are no reports in patients with various clinical stages of oral squamous cell carcinoma. We carried out this study to assess the level of oxidative stress in oral cancer patients with various clinical stages. METHODS: Blood samples of 48 adult male oral cancer patients with various clinical stages of oral cancer (stage II to stage IV, 16 of each) and 16 age and sex matched healthy subjects were collected. Plasma and erythrocytes levels of thiobarbituric acid reactive substances (TBARS), vitamin E, reduced glutathione (GSH), and activities of superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx) were assayed using specific colorimetric methods. The statistical comparisons were performed by one way analysis of variance (ANOVA) followed by Student's t-test. RESULTS: Elevated lipid peroxidation and decline in non-enzymatic and enzymatic antioxidants status were noticed in oral cancer patients as compared to healthy subjects. The TBARS levels were gradually increased whereas antioxidants were gradually reduced from stage II to stage IV of oral cancer patients. INTERPRETATION & CONCLUSION: The altered lipid peroxidation in plasma and erythrocytes of oral cancer patients may be related to their compensatory changes in the antioxidants defense system.