BRCA1 and ovarian carcinoma: Hereditary breast and ovarian cancer (HBOC) caused by pathogenic variants in BRCA1 or BRCA2 represent approximately 2% of breast cancers1 and 10%‐15% of ovarian cancers.2, 3 Clinical counseling and testing services for hereditary breast and ovarian cancer have been available since the 1990s and criteria for identifying breast and ovarian cancer cases due to hereditary causes have been developed over time.