Inherited Breast Cancer

 

Breast Cancer

The majority of breast cancers are not inherited. In fact, only 5 to 10 percent of breast cancers are linked to genetic mutations passed down through generations.

The most common gene mutations linked to breast cancer are BRCA1 and BRCA2.

Both of these mutations also increase the risk of other cancers throughout a woman's lifetime, particularly ovarian cancer.

In normal cells, the BRCA1 and BRCA2 genes help prevent cancer by making proteins that keep the cells from growing abnormally. If these genes are mutated, the cancer-prevention response will not work properly.

For some women with the BRCA1 mutation, the lifetime risk of breast cancer is as high as 80 percent. On average, however, this risk is more like 55 to 65 percent.

For women with the BRCA2 mutation, the lifetime risk of breast cancer is around 45 percent.

Breast cancers linked to these mutations occur more often in younger women. Cancer affecting both breasts is also more common than in cases not linked to these mutations.

While the BRCA1 and BRCA2 mutations may affect anyone, they are more common in Jewish people of Eastern European origin than in other racial and ethnic groups in the United States.

Men can also carry these mutations, and if they do they are at increased risk for breast and other cancers, such as prostate cancer.

Genetic Testing

Genetic testing may be an option if you have a family history of breast cancer or other cancers.

Through a blood or saliva test, scientists can identify specific inherited mutations in BRCA or other genes.

Talk with your doctor about whether genetic testing is a good option for you. Your doctor can also recommend a genetic counselor who can discuss your testing options with you in detail.

Check with your insurance company to see if BRCA1 and BRCA2 mutation testing is covered under your plan.

Genetic counseling and testing for people at high risk is a covered preventive service under the Affordable Care Act (ACA).

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