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目前人们认为肿瘤都是工业化学品引起的。其实,许多致癌原都是天然物质,而工业化学品可能占次要地位。为了预防肿瘤,首先要检测环境中的致癌原和诱变剂,然后区分重要与不重要的致癌原。为什么要建立短期试验方法确定致癌原最好的方法是流行病学调查。例如英国男人肺癌发病率的上升与香烟消耗量的增加有密切关系。在香烟消耗量增加后20年左右,肺癌发病率明显上升,因为肺
At present, people think that tumors are caused by industrial chemicals. In fact, many carcinogens are natural substances, and industrial chemicals may play a minor role. In order to prevent tumors, it is first necessary to detect the carcinogens and mutagens in the environment, and then to distinguish important and unimportant carcinogens. Why establish the short-term test method to determine the best method of carcinogen is epidemiological investigation. For example, the increase in the incidence of lung cancer in British men is closely related to the increase in cigarette consumption. About 20 years after the consumption of cigarettes increased, the incidence of lung cancer increased significantly because of the lungs.