Inherited genetic mutations can increase a woman’s risk of developing breast cancer. For instance, a mutation in two of the better-understood genes linked to a substantial increased risk of breast cancer, the BRCA1 and BRCA2 genes, account for up to:

• 10 percent of all breast cancers.
• 50 percent of hereditary breast cancers (caused by inherited genetic mutations).

Women with a strong family history of breast cancer should take time to learn how genetic testing is appropriate for them. It is important to remember that risk can be passed down from either your father or mother. A detailed knowledge of the medical history of your relatives can be extremely helpful.

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