Silva S.N., Cabral M.N., Bezerra de Castro G., Pires M., Azevedo A.P.,Manita I., Pina J.E., Rueff J., Gaspar J. Breast cancer risk and polymorphismsin genes involved in metabolism of estrogens (CYP17,HSD17beta1, COMT and MnSOD): possible protective role ofMnSODgene polymorphism Val/Ala and Ala/Ala in women thatnever breast fed. Here, SOD2 is linked to breast cancer.