结论：双侧原发性乳腺癌的预后取决于腋窝淋巴结有无转移，肿瘤大小以及ER受体是否阳性。
Conclusions the prognosis of bilateral primary mammary cancer is decided by whether axilla lymph node has transferred, whether the tumor is big or small, and whether the er receptor is positive.
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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