What’s your breast cancer risk? This study aims to tell you precisely

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Breast cancer is one of the most worrisome diagnoses a woman can get, and now women know that they can get a heads-up if they have an extra-high risk by getting a genetic test.

Mutations in dozens of different genes can raise the risk of breast cancer, but the two best-known risk genes are BRCA1 and BRCA2. Everyone carries these genes. When breast cancer, ovarian cancer or prostate cancer runs in a family, doctors often advise getting a test to assess whether a patient carries a risky version of one of them.

Now there are home tests for common BRCA1 and BRCA2 mutations. Some clearly raise a woman’s risk of cancer, and she can get more regular mammograms or, as actress Angelie Jolie opted to do, have her breasts surgically removed.

However, many people have mutations called variants of uncertain significance. It’s not known whether they raise cancer risk.