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The pathogenic variant (PV) or likely pathogenic variant (LPV)  BRCA1/2  gene is strongly associated with hereditary breast or ovarian cancer. Therefore, it is important to screen blood relatives to establish preventive modalities and surveillance. This study evaluated the feasibility of targeted cascade genetic testing for family members of  BRCA1/2  gene PV or LPV carriers. We screened 18 families for  BRCA1/2  gene status via the conventional cascade genetic test (n = 9) and targeted cascade genetic test (n = 9), which targeted the exon region wherein the index patient showed PV or LPV. The pedigree and clinicopathologic characteristics were reviewed and analyzed. All index patients were diagnosed with breast cancer, while the third family members were all healthy. In the conventional cascade test group, 3 index patients and 3 family members had the  BRCA1/2  gene PV or LPV. In the targeted cascade test group, 5 family members had same type of  BRCA1/2  gene PV or LPV as their index patients. Two families had an identical string of  BRCA1/2  gene PV or LPV. Although the targeted cascade genetic test cannot completely characterize the  BRCA1/2  gene, it is sufficient for determining its PV or LPV status. This limited genetic test can be used for family members of PV or LPV carriers.

Feasibility of targeted cascade genetic testing in the family members of BRCA1/2 gene pathogenic variant/likely pathogenic variant carriers