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由于人类一些常见癌症的病因与发病条件至今尚未能明确鉴定,使预防癌症的问题难于解决,即使今后查明了各种病因因素,也未见得可以从环境中全部排除或完全避免接触,例如有致癌危险的亚硝基化合物可以在人体内形成。近年来对癌症预防的观念已有一些新的认识,认为除了应致力于消除或避免环境中的病因因素以外,还应包括对致癌过程中的干预作用以阻断癌症的发生和发展,其中采用化学药物来干预致癌过程称为“化学预防”。在许多动物癌症实验研究中已发现一些化学
As the etiology and condition of some common cancers have not yet been clearly identified so that the problem of cancer prevention is difficult to solve, and even if various etiological factors are identified in the future, it can not be completely eliminated or completely avoided from the environment, for example, There are carcinogenic nitroso compounds can form in the human body. In recent years, the concept of cancer prevention has some new understanding that, in addition to efforts should be made to eliminate or avoid the cause of environmental factors, should also include the role of cancer in the intervention to prevent the occurrence and development of cancer, which adopted Chemotherapy to interfere with the carcinogenic process known as “chemical prevention.” Some chemistry has been found in many animal cancer experimental studies