PD-1 is actually called PD-1 inhibitor, belongs to the immune checkpoint inhibitors, mainly can be used for malignant tumors, as well as autoimmune disease patients.PD-1 inhibitors are different from the traditional chemotherapy or targeted therapy drugs, mainly through the regulation of the immune system, so that the immune cells, such as T-cells, etc., can recognize the tumor cells, and thus play a role in the attack on the tumor cells, so that the immune system to play the anti-tumor effect. PD-1 inhibitors, which are the hotspots of clinical application and research, can be used to treat a variety of malignant tumors, such as Hodgkin’s lymphoma and other solid tumors, etc. And PD-1 inhibitors are more effective than PD-1 inhibitors. Moreover, PD-1 inhibitors usually have fewer side effects than traditional chemotherapeutic drugs.