(三)肿瘤免疫近年来,随着免疫学的发展,大量动物实验和临床观察材料表明,在恶性肿瘤的发生发展过程中,确实可以证明一系列免疫现象;肿瘤的发生、恶化或好转,在很大程度上受机体免疫功能,尤其是细胞免疫功能的影响。曾经证明,摘除胸腺或用其他方法(如X线照射,给予大量免疫抑制剂等)使动物的免疫功能降低,往往容易诱发肿瘤。免疫缺陷病患者或免疫功能衰退的老年人,恶性肿瘤的发生率往往明 (C) tumor immunity In recent years, with the development of immunology, a large number of animal experiments and clinical observation of the material shows that in the occurrence and development of malignant tumors, can indeed prove a series of immune phenomena; tumor occurrence, deterioration or improvement in To a large extent by the body’s immune function, especially cellular immune function. Once proved that removal of the thymus or by other means (such as X-ray irradiation, given a large number of immunosuppressive agents, etc.) to reduce the immune function of animals, often easy to induce tumors. Immune deficiency disease or immune dysfunction in the elderly, the incidence of malignant tumors are often bright