What percent of breast cancers are linked to BRCA gene mutations?

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Multiple Choice

What percent of breast cancers are linked to BRCA gene mutations?

Inherited BRCA1/BRCA2 mutations contribute to a minority of breast cancers. The proportion across all breast cancer cases is about 5–10% linked to these inherited mutations. This reflects the fact that while BRCA mutations markedly increase an individual’s risk, they are relatively uncommon in the general population, so most breast cancers arise from non-BRCA-related factors or other genetic changes. In families with strong history or founder mutations, the BRCA-related share within those groups may be higher, but the overall figure across all cases stays in the 5–10% range.

Inherited BRCA1/BRCA2 mutations contribute to a minority of breast cancers. The proportion across all breast cancer cases is about 5–10% linked to these inherited mutations. This reflects the fact that while BRCA mutations markedly increase an individual’s risk, they are relatively uncommon in the general population, so most breast cancers arise from non-BRCA-related factors or other genetic changes. In families with strong history or founder mutations, the BRCA-related share within those groups may be higher, but the overall figure across all cases stays in the 5–10% range.

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