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关于环境与肿瘤的关系问题,文献报导已经浩如烟海。之所以引起预防医学的如此重视,原因很多,但主要有二点:一是目前各国家的死亡病例中,约有1/4～1/8死于肿瘤;二是这些肿瘤的病因约80～90％与环境因素有关。在环境致癌因素中,化学因素是主因。因此,化学致癌作用又是目前环境致癌的探讨主题。一、化学致癌物截至1977年11月止,据美国化学学会化学文摘部门登记资料,全世界化学物质总数为4,039,907种,并正按每年平均增加6000种的速度在上升,其中常用的化学物质为63000种,约有2500种食物添加剂被作为食用和调味品,约有2000种被用作赋形
On the relationship between environment and cancer, literary reports have been numerous. The reason why prevention medicine so much attention, for many reasons, but there are two main points: First, the current death toll in various countries, about 1/4 ~ 1/8 died of cancer; second is the cause of these tumors is about 80 ~ 90% and environmental factors. In the environment of carcinogenic factors, chemical factors is the main cause. Therefore, the role of chemical carcinogens is the current theme of carcinogenic environment. I. Chemical carcinogens As of November 1977, according to the registration information of the Chemical Abstracts Service of the American Chemical Society, the total number of chemical substances in the world is 4,039,907 and is increasing at an average rate of 6,000 annually, of which the commonly used chemical substances are About 63,000 species, about 2,500 kinds of food additives are used as food and condiments, about 2,000 are used as shaping