Additionally, inherited mono-allelic mutations in BACH1/BRIP1/FANCJ and FANCN/PALB2 have been recently implicated in breast cancer predisposition (familial breast cancer) [97][23,24], suggesting that these genes may be the low penetrance breast/ovarian cancer susceptibility genes researchers have been looking for to explain the non-BRCA1/non-BRCA2 cases. This evidence concerns the gene PALB2 and breast cancer.