根据当前较多研究者的看法,肿瘤宿主不能有效地排斥肿瘤,并非由于其免疫系统在功能上有缺陷,而是免疫调节异常所致。这种异常现象主要表现在向下调节(down fegulation)占了优势,从而导致了低免疫状态(depressed immunity)。这可能是宿主对肿瘤排斥失效的原因之一。已知参与免疫调节的成分(调节细胞和调节分 According to many current researchers, the tumor host can not effectively exclude the tumor, not because of its immune system is functionally defective, but due to abnormal immune regulation. This anomaly predominantly manifests itself in the advantage of down fegulation, leading to depressed immunity. This may be one of the reasons host failure of tumor rejection. Known to participate in immune regulation of the ingredients (regulatory cells and regulatory points