男性乳腺癌罕见，在美国每年仅发生1400例，无法收集大组病例与女性乳腺癌进行比较。作者应用1985～1994年国家癌肿资料库，在其中4775例男性和624174例女性病例进行配对比较，即相同年龄、种族、生活条件、肿瘤类型和分级、肿瘤大小和淋巴结情况、以及同一医院收治的对象进行 Male breast cancer is rare, with only 1400 cases occurring each year in the United States, and large numbers of cases can not be collected for comparison with female breast cancer. The authors used the National Cancer Database from 1985 to 1994 in which 4,775 males and 624,174 females were matched for pairing, ie same age, ethnicity, living conditions, tumor type and grade, tumor size and lymph node status, and the same hospital for treatment The object