BRCA1 and breast cancer: Although previous studies in our region have demonstrated that the tested BRCA1 PVs—c.4035del and c.5266dup—account for approximately 80% of identified BRCA1 PVs [4,8,9,10,11], it is important to acknowledge that this study focused only on these variants and did not investigate individuals with additional BRCA1 PVs relevant to the development of BC and OC.