人类在长期与癌症作斗争中取得了许多经验,也遇到不少困难和矛盾,主要困难之一是抗肿瘤药剂不易选择浓集于肿瘤组织,不仅难以达到有效的治癌浓度,而且还会对被其普遍播散分布的健康内脏组织以至全身产生毒性效应,因而如何提高抗癌药物在肿瘤组织内的选择浓集度,己成为许多医学、生物学工作者关心的重要课题。免疫反应的高度特异性使人们 Human beings have obtained a lot of experience in the fight against cancer for a long time and encountered many difficulties and contradictions. One of the major difficulties is that antitumor agents are not easy to concentrate on tumor tissues, and it is not only difficult to achieve effective cancer concentration, but also It has a toxic effect on healthy visceral tissues and its systemic distribution. Therefore, how to increase the concentration of anticancer drugs in tumor tissues has become an important subject for many medical and biological workers. The highly specific nature of the immune response makes people