乳腺癌是危害妇女健康的常见恶性肿瘤,自20世纪70年代末,其发病率一直位居女性肿瘤的首位,并以每年2%的速度递增。中国不是乳腺癌的高发国家,据肿瘤防治办公室、卫生部卫生统计信息中心2002年公布的1993～1997年12市县乳腺癌发病登记资料统计显示:其中上海、北京、天津分别为41 Breast cancer is a common malignant tumor that endangers women’s health. Since the late 1970s, the incidence of breast cancer has been the highest among women and has been increasing by 2% annually. China is not a country with high incidence of breast cancer. According to statistical data of registration of breast cancer in 12 counties from 1993 to 1997 published by the Center for Disease Control and Prevention, Ministry of Health and Health Statistics and Information Center in 2002, Shanghai, Beijing and Tianjin are respectively 41