In addition to the main breast cancer genes, BRCA1 [MIM #113705] [3] and BRCA2 [MIM #600185] [4], inactivating mutations in ATM [MIM #607585], BARD1 [MIM#601593], BRIP1 [MIM#605882], CHEK2 [MIM #604373], PALB2 [MIM #610355], RAD51C [MIM#602774], and RAD51D [MIM#602954], among others, confer risk to breast and/or ovarian cancer [1,2,5,6]. This evidence concerns the gene BRCA2 and breast cancer.