The decreased infiltration and functional deficiency of DCs may also contribute to tumor cells evading from surveillance of immune system.
DC数量减少和功能缺陷，也是肿瘤细胞逃避机体免疫监视的机制之一。
Some tumor cells (e. g., t lymphoma EL4 cells) express CD47 and block phagocytosis of phagocytes in order to escape from the surveillance of immune system.
一些肿瘤细胞譬如T细胞淋巴瘤el 4细胞等也表达CD 47分子，抑制机体吞噬细胞功能逃逸免疫系统的免疫监视。
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