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近十年来,实验肿瘤学获得的资料促进了对人类恶性肿瘤产生的原因和机理的了解。其中主要有:1)揭示了化学致癌物的代谢;2)关于癌症发生过程的两阶段学说;3)发现了新的致癌物—亚硝基化合物。业已证明,大多数致癌物在体内受到肝脏和其它器官的酶系统的代谢活
In the past decade, the data obtained from experimental oncology has contributed to the understanding of the causes and mechanisms of human malignancy. Among them are: 1) revealing the metabolism of chemical carcinogens; 2) the two-stage doctrine of the cancer process; 3) the discovery of new carcinogens - nitroso compounds. It has been shown that most carcinogens are metabolized in the body by enzymes of the liver and other organs