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肿瘤是一种严重威胁人类生命和健康的多发病、常见病。有人估计,在人类癌症中至少有80—90％是由环境致癌物引起的,或与环境致癌物有密切关系,而其中化学致癌物约占90％左右。因此,在当前环境污染严重而又无法很快消除的情况下,研究化学性肿瘤的防治具有重要的实际意义。目前已经知道,许多化学致癌物在不同程度上均能抑制机体的免疫反应能力,而且剂量越大,免疫力被抑制越厉害,反复多次给药,免疫抑制可出现蓄积现象。由此可见,恢复机体的免疫力是治疗化学性肿瘤的重要途径或必要措施之一。经大量的研究证
Cancer is a frequently-occurring, common disease that seriously threatens human life and health. It has been estimated that at least 80-90% of human cancers are caused by environmental carcinogens or are closely related to environmental carcinogens, of which about 90% are chemical carcinogens. Therefore, it is of great practical significance to study the prevention and treatment of chemical tumors when the current environmental pollution is serious and can not be eliminated quickly. It has been known that many chemical carcinogens can inhibit the immune response of the body to varying degrees, and that the greater the dose, the greater the inhibition of immunity. Repeated administrations may result in accumulation of immunosuppression. It can be seen that restoring the body’s immunity is one of the important ways or necessary measures to treat chemical tumors. After a lot of research certificate