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Immunotherapy that inhibits the interaction between programmed death ligand 1 (PD-L1), present on the surface of tumor or antigen-presenting cells, and programmed death 1 (PD-1), present on the surface of activated lymphocytes, is generating much excitement and enthusiasm. Although considerable knowledge has been accumulated on anti-PD-L1 and anti-PD-1 reagents, discovering immunotherapy-associated issues still remains a pressing task for the researchers and clinicians.