The aim of this study was to investigate four genetic polymorphisms of the antioxidant enzymes involved in oxidative stress (glutathione peroxidase Pro198Leu, catalase C−262T, glutathione peroxidase S-transferase M1 null allele, and glutathione peroxidase S-transferase T1 null allele) and their association with endometriosis-related infertility. Here, CAT is linked to Infertility.