Immune Checkpoint inhibitor Therapy in Various Cancers

Abstract

Immune checkpoint inhibitors (ICIs) are a new way of immunotherapy, not simply refers to the improvement of immunity to the body, but by improving the immune microenvironment around the tumor, thereby activating immune cell activity in vivo to achieve anti-tumor purposes. Now, CTLA‐4 and PD‐1 or PD‐L1 monoclonal antibody are mainly developed relatively successfully for immune checkpoints, in addition to other new immune checkpoints that have been discovered and clinically tested. However, while immune checkpoint inhibitors have been developed successively, some vague problems still need to be solved, such as the large gap between the immunotherapy effects of different patients. These issues are critical to the selection of immune checkpoint inhibitors. In this review, based on the study of the immunosuppressive mechanism of CTLA-4 and PD-1/PD-L1, the application of related immune checkpoint inhibitors in cancer treatment is discussed starting from three representative types of cancer. At the same time, according to the existing problems, some common immune-related adverse events and newly discovered immune checkpoints are summarized, and the future research direction of ICIs is further explored.