SOD1 and neoplasm: Enzymatic antioxidants such as superoxide dismutase (SOD), catalase (CAT), reduced glutathione (GSSH), and glutathione peroxidase (GPx), along with nonenzymatic antioxidants like vitamins B-complex, C, E, ß carotene, and the mineral selenium, may be produced either by the tumor cells themselves or in response to the body's reaction to tumor growth [8].