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1940年后,流行病学除用于对疾病的传染性病因进行人群研究之外,又渐增加了对非传染病因的研究,包括吸烟、石棉、β-萘胺、氯乙烯、双氯甲醚和辐射的研究,积累了许多宝贵的资料。至1970年前后,公众和学术界对癌的认识发生了改变,从以往认为癌是年龄增大必然伴随的结果,到认为癌是一组与外源性病因有联系的疾病,其中有些外因已被认识,有些尚待识别。1976年Terris提出
After 1940, epidemiology was used in addition to population studies of the infectious etiology of the disease, and a growing body of research was focused on the etiology of noncommunicable causes including smoking, asbestos, beta-naphthylamine, vinyl chloride, bischloromethyl ether And radiation research, has accumulated a lot of valuable information. By 1970, the public and the academic community have changed their understanding of cancer. In the past, cancer was considered to be the inevitable result of aging. It was considered that cancer is a group of diseases associated with exogenous causes. Some of these extrinsic Be recognized, some yet to be identified. In 1976, Terris proposed