BRCA1 and breast cancer: Peak 1 includes SNPs that encompass the BABAM1, ABHD8 and ANKLE1 gene and are associated with serous OC, ER-negative BC and BC risk for BRCA1 mutation carriers (Fig. 1 and Supplementary Fig. 1); Peak 2 includes SNPs located in the MYO9B gene associated only with BC risk in BRCA1 mutation carriers.