根据免疫监视理论,免疫系统的主要功能之一是控制恶性肿瘤的发生。在动物实验及人体肿瘤的研究中已证实肿瘤是有特异性及相关性抗原,肿瘤引起宿主的免疫反应已是公认的事实。但为什么恶性肿瘤能逃脱宿主免疫攻击而继续生长、转移、发展呢?这一问题是近年来肿瘤免疫的重心所在。目前有关的认识有以下一些方面:一、恶性肿瘤与宿主免疫力的比势在动物实验中发现,免疫淋巴细胞要数 According to immunosurveillance theory, one of the main functions of the immune system is to control the occurrence of malignant tumors. In animal studies and studies of human tumors, it has been confirmed that tumors are specific and related antigens, and tumor-induced immune responses in the host are recognized facts. But why can malignant tumors escape the host immune attack and continue to grow, metastasize, and develop? This problem is the focus of cancer immunity in recent years. Current understandings include the following aspects: First, the odds of malignancy and host immunity are found in animal experiments.