CAT and cervical intraepithelial neoplasia: Lower GSH-Px activity, lower plasma antioxidant vitamin levels and higher MDA concentrations were documented in women suffering from cervical intraepithelial neoplasia or invasive cervical cancer compared to women in the Control Group.7 Higher MDA levels were also reported in cervical cancer patients compared to controls,8 along with lower levels of antioxidant enzymes superoxide dismutase (SOD), catalase (CAT) and GSH-Px.