About 20% of all women with breast cancer have a familial breast cancer pedigree.

在患乳腺癌的妇女中大约有20%的妇女有这样一种家系史。

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Finally, men may not be aware of familial breast cancer risk and may not communicate this information to their relatives.

最终，男性也许不会意识到家族性乳腺癌的危险并且可能不会和亲戚们交流这些信息。

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Conclusions: 1. The main risk factors of BPBC may be once having breast cancer, familial history of breast cancers, etc.

结论：1、患一侧乳腺癌、有乳腺癌家族史等是发生双侧乳腺癌的重要危险因素。

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