免疫系统能使肿瘤处于平衡状态,即肿瘤既不消退也不进展。Smyth和Schreiber等发现了这种平衡状态的证据。免疫系统对肿瘤的发展起着至关重要的作用:它能通过免疫监视发现早期损伤并将其清除;免疫系统能将肿瘤维持在平衡状态;免疫原性减弱的肿瘤细胞或使免疫应答能力减弱的肿瘤 Immune system can make the tumor in balance, that is, the tumor neither subside nor progress. Smyth and Schreiber found evidence of this balance. The immune system plays a crucial role in the development of the tumor: it detects and removes early lesions through immune surveillance; the immune system maintains the tumor in equilibrium; the immunocompromised tumor cells or diminishes the immune response Of the tumor