The French Genetic and Cancer Group (GGC)—Unicancer—an expert group that creates guidelines for the detection and the prevention of hereditary cancers in affected families, selected a set of 13 genes to be included in an HBOC diagnosis panel: BRCA1, BRCA2, PALB2, TP53, CDH1, PTEN, RAD51C, RAD51D, MLH1, MSH2, MSH6, PMS2, and EPCAM [5]. This evidence concerns the gene BRCA1 and cancer.