在世界范围内,乳腺癌的发病情况不一,总的说来,以西方国家(如美国、加拿大、澳大利亚、新西兰、南非及西欧等)的发病率为最高,东欧及南欧国家次之,亚洲、非洲以及拉丁美洲等国家则相对较低.我国与欧美国家相比,虽属乳腺癌低发国家,但乳腺癌仍是妇女最常见的恶性肿瘤之一,对妇女生命健康威胁甚大. In the world, the incidence of breast cancer varies. Generally speaking, the incidence rate in Western countries (such as the United States, Canada, Australia, New Zealand, South Africa and Western Europe) is the highest, followed by Eastern European and Southern European countries, Asia. Countries such as Africa and Latin America are relatively low. Compared with Europe and the United States, China is a country with low incidence of breast cancer, but breast cancer is still one of the most common malignant tumors among women and poses a great threat to women’s life and health.