Genetic susceptibility to breast cancer is attributed to germline mutations in either BRCA1 or BRCA2 as well as other genes, notably some genes that encode for BRCA1- and BRCA2-interacting proteins, FANCJ and PALB2. The percentage of contribution of the non-BRCA genes is unclear and not indicated. Inheriting bi-allelic mutations in some breast cancer genes, which are underlined, results in Fanconi anemia associated with complementation groups BRCA2/FANCD1, PALB2/FANCN and BACH1/FANCJ/BRIP1.