Whether you inherited an abnormal breast cancer gene or acquired it, if you have one normal gene, that gene will still work to control cell growth and prevent cancer.

无论你具有遗传性还是获得性异常乳癌基因，如果你有一个正常基因，这个基因都仍将运行以控制细胞生长并预防基因。

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Atypical ductal hyperplasia is abnormal cells that grow in the milk ducts of the breast.

非典型腺管增生是一种生长在乳导管里的不正常细胞。

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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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"When it comes to breast cancer risks, the extra fat in obesity leads to extra estrogen production, which can lead to extra breast cell growth, including abnormal breast cell growths, " she said.

CNN: Tweens challenged by grown-up malady: Breast cancer

In DCIS, abnormal cells multiply and form a growth within a breast milk duct .

CNN: Martina Navratilova has breast cancer