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Brca Mutations

Disease

True negatives not at high risk for invasive breast cancer

Researchers followed 375 US women who tested negative for the BRCA1 or BRCA2 mutations their close relatives carry. Over 4.9 years they saw two invasive breast cancers against four expected, and two in situ cases against 0.9 expected. The study is small and a health observer cautions about errors.

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