乳腺癌是最常见的妇女恶性肿瘤之一 ,在一些发达国家居妇女的恶性肿瘤发病率及死亡率的首位。我国由于经济不断发展 ,人民生活的不断提高 ,乳腺癌的发病率也在逐渐上升 ,并在年龄上趋向早发。目前乳腺癌的发病机理尚不完全清楚 ,但有文献报道大约有 5%～ 10 %的乳腺癌患者有家 Breast cancer is one of the most common malignancies in women and it ranks first in the incidence of malignant tumors and mortality among women in some developed countries. Because of the continuous economic development in our country and the continuous improvement of people’s lives, the incidence of breast cancer is also gradually increasing, and it tends to be premature in age. At present, the pathogenesis of breast cancer is not completely clear, but there are reports in the literature that about 5% to 10% of breast cancer patients have a home