This gene is different from the breast-cancer susceptibility genes, BRCA1 and BRCA2, which women are born with.

这些基因不同于以往的乳腺癌易感基因BRCA1和BRCA2。以往的易感基因是先天具有的。

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But it's far smaller than the fivefold increased risk that comes from inheriting certain mutations in the BRCA1 and BRCA2 genes.

但是，与因继承了乳腺癌易感基因1和乳腺癌易感基因2中的某些基因突变而增加了5倍风险相比，这种冒险是小得多的。

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Heredity accounts for about 10% of all breast cancers, and abnormal BRCA1 and BRCA2 genes explain a large number of these cancers.

大约10%的乳腺癌是这一类型，不正常的BRCA1和BRCA2基因是导致这一类型癌症的主要原因。

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In the case of BRCA1 and BRCA2, the patents are held by Myriad Genetics.

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Because more than 99% of women do not have BRCA1 -- or BRCA2, for that matter.

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Mutations of the BRCA1 and BRCA2 genes have been linked to hereditary breast and ovarian cancer.

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