PD-1 (programmed cell death protein 1), the programmed death receptor 1, is an important immunosuppressive molecule. Immunomodulation which targets PD-1 is of great importance to anti-tumor, anti-infective, anti-autoimmune diseases, and organ transplant survival. In recent years, scientists have made a number of achievements in the field of PD-1 research. We will share the relevant research here.   1.Science: Scientists confirm that intestinal microbes affect PD-1 / L1 antibody treatment for…