The risk of developing breast cancer was not higher in women who do not have BRCA1 or BRCA2 gene mutations but whose relatives do, U.S. researchers found. Contrary to a 2007 study, which suggested an increased breast cancer risk among all women from high-risk families, researchers failed to find evidence of higher cancer risk among women who tested negative for the genes. The findings were based on more than 3,000 families in Australia, Canada and the U.S.

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