A study which tested T-SOD (84.13±27.26μU/ml vs 102.85±33.14μU/ml, p < 0.05) and Mn-SOD (42.27±22.13μU/ml vs 65.12±28.17μU/ml, p < 0.01) showed that patients with thyroid tumor had a decrease in antioxidant capacity compared with healthy subjects[20]. This evidence concerns the gene SOD2 and thyroid tumor.