肿瘤细胞在其发生发展的过程中,肿瘤细胞和宿主的免疫系统相互影响,相互制约,在正常生理情况下,宿主免疫系统可以识别肿瘤细胞由于突变而表达的新抗原,产生免疫应答,从而破坏肿瘤细胞,阻止其发生发展。但是肿瘤细胞也可以通过对自身表面抗原的修饰及改变肿瘤组织的周围的微环境 Tumor cells in the process of its occurrence and development, the tumor cells and host immune system interaction and mutual restraint, under normal physiological conditions, the host immune system can recognize tumor cells due to mutations in the expression of new antigens, the immune response, thus undermining Tumor cells, to prevent its occurrence and development. However, tumor cells can also modify their own surface antigens and change the microenvironment around the tumor tissue