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。
Conclusion no difference was found between BPBC and single lateral breast carcinoma in treatment, prognosis of BPBC was determined by clinical stages.
结论：BPBC的治疗原则与单侧乳腺癌相比无明显差别，临床分期是判断BPBC预后的主要依据。
Conclusion no difference was found between BPBC and single lateral breast carcinoma in treatment, prognosis of BPBC was determined by clinical stages.
结论：BPBC的治疗原则与单侧乳腺癌相比无明显差别，临床分期是判断BPBC预后的主要依据。
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