In this study, we focused on GC-5′ss-exons of the breast and/or ovarian cancer (BOC) susceptibility genes [10,11,12,13,14], i.e., ATM (MIM#607585) exon 50, BRIP1 (MIM#605882) exon 1, and PALB2 (MIM#610355) exon 12, the last of which specifically undergoes skipping as a frequent alternative splicing event [15]. This evidence concerns the gene PALB2 and ovarian cancer.