18 Gudmundsdottir Gudmundsdottir K K Thorlacius Thorlacius S S Jonasson Jonasson JG JG Sigfusson Sigfusson BF BF Tryggvado Hir Tryggvado Hir L L Eyfjord Eyfjord JE JE CYP17 promoter polymorphism and breast cancer risk in males and females in relation to BRCA2 status CYP17 promoter polymorphism and breast cancer risk in males and females in relation to BRCA2 status Br J Cancer Br J Cancer 2003 2003 88 88 6 6 933 933 936 936 12644832 12644832. This evidence concerns the gene BRCA2 and breast cancer.