Clinical screening using the National Comprehensive Cancer Network (NCCN) testing criteria may fail to identify all patients with hereditary breast and ovarian cancers. Thus, this study aimed to evaluate the strategy of expanding target patients for genetic testing among Japanese patients.
Patients and Methods
We reviewed the medical records of 91 breast cancer patients who were genetically tested.
Among 91 patients, eight were diagnosed with pathogenic or likely pathogenic variants: BRCA1 (n=4) and BRCA2 (n=4). Among 50 patients meeting the testing criteria of the guideline, six (12%, 95% confidence interval; 4.5–24.3%) were diagnosed with pathogenic or likely pathogenic variants. The sensitivity and specificity of screening using the testing criteria were 75% and 47%, respectively. Expanding the NCCN criteria to include all women diagnosed with breast cancer aged ≤ 65 years achieved 88% sensitivity but 8% specificity.
The expansion of the NCCN criteria could benefit Japanese patients.