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乳腺癌是美国40～44岁妇女的第一位死因,几乎每11个美国妇女中即有一人患此病。由此可见,与发病有关的因素可能是一些很常见的、每个美国妇女都可能接触的因素。世界各地乳腺癌发病率和死亡率差异很大。但流行病学的配对调查除了在乳腺癌家族史、良性乳腺疾病史和初产年龄上有些差别外,都未能提供任何其他特殊因素来解释这种差异的原因。近来有关流行病学调查发现:随着国家“西方化”程度的增加,乳腺癌发病率、死亡率也增加。从低发区移到高发区妇女乳腺癌发病率都有增加。在同一国家内,生活力式不同的人群发病率及死亡率也有差异。以上这些都
Breast cancer is the No. 1 cause of death for women aged 40-44 in the United States, and it affects almost one in 11 U.S. women. From this we can see that morbidity-related factors may be some common factors that every American woman may have exposure to. The incidence and mortality of breast cancer vary widely across the world. However, the epidemiological paired investigation failed to provide any other special reason to explain this difference, except for some differences in the family history of breast cancer, the history of benign breast disease and the age at first birth. Recent epidemiological survey found that: with the increase of the degree of “Westernization” in the country, the incidence and mortality of breast cancer also increased. The incidence of breast cancer in women who migrated from areas with low incidence to high incidence areas increased. There are also differences in morbidity and mortality among people with different life forms in the same country. These are all above