CAT and neoplasm: For example, HCH induced oxidative stress in Ehrlich Ascites tumor cells was studied by Srivastava and Shivanandappa [42], their results could be characterized by glutathione depletion, lipid peroxidation (LPO), reactive oxygen species (ROS) production and inhibition of antioxidant enzymes, superoxide dismutase (SOD) and catalase (CAT).