Hazard ratios of lowest serum levels of SOD activity and TBARS to mortality rates from cancer were 2.68 (95%C.I., 1.05-6.82) and 0.71 (95%C.I.: 0.31-1.67), and those to mortality rates from all causes were 1.55 (95% C.I., 0.90-2.66) and 0.88 (95%C.I.: 0.51-1.50), respectively. Here, SOD1 is linked to cancer.