SOD1 and cancer: Four key proteins, NADH:Ubiquinone oxidoreductase core subunit S1 (NDUFS1), cytochrome b-c1 complex subunit 2 (UQCRC2), SERPINA5 and superoxide dismutase 1 (SOD1), were validated using Western blot in different cancer types, such as testicular cancer, Hodgkin’s disease, leukemia, and lymphoma, in comparison with fertile men (Supplementary Figure S1).