Abstract
Tumor immune escape is one of the ten characteristics of tumor occurrence and development. Immunotherapy targeting immune escape has achieved remarkable success in recent years. Immunotherapy involves many factors and links, which are related to the changes of tumor cells themselves and tumor microenvironment, and the mechanism is complex. At present, it still faces great challenges in clinical practice. This article introduces the mechanism of tumor immune escape from several aspects, including the changes of tumor itself, the changes of tumor induced microenvironment, and the tumor microenvironment promoting tumor development. At the same time, in view of these mechanisms, the current treatment strategies were sorted out, including the predicament and progress of immune checkpoint inhibitors, CAR-T therapy and immune cell therapy, aiming to clarify the ideas for the next development of tumor immunotherapy.