ABSTRACT: Using multigene panel testing for the diagnostic evaluation of patients with hereditary breast and ovarian cancer (HBOC) syndrome often identifies clinically actionable variants in genes with varying levels of penetrance. High-penetrance genes (BRCA1, BRCA2, CDH1, PALB2, PTEN, STK11, TP53) inform specific clinical surveillance and therapeutic decisions, while recommendations for moderate-penetrance genes (ATM, BARD1, BRIP1, CHEK2, MLH1, MSH2, MSH6, PMS2, EPCAM, NF1, RAD51C, RAD51D) are more limited. A detailed disease history, including pedigree data, helps formulate the most appropriate and personalised management strategies. In this study, we evaluated the