结果：发病年龄呈现年轻化趋势，尤其同时性双侧乳腺癌明显，绝经前女性更易发生双侧乳腺癌；

Results: The age of patients suffering from double sides breast cancer was trending younger. The females before menopause had more probabilities of suffering from double sides breast cancer.

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结果：本组6例双侧乳腺癌占同期收治乳腺癌的2.1%，均是双侧原发性乳腺癌，其中同时性双侧乳腺癌有4例。

Results: The 6 bilateral breast cancer accounted for 2.1% of all breast cancer cases for the same period.

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