Summary: | The A<sub>2A</sub> adenosine receptor (A<sub>2A</sub>AR) plays critical roles in human physiology and pathophysiology, which makes it an important drug target. Previous drug-discovery efforts targeting the A<sub>2A</sub>AR have been focused on the use of A<sub>2A</sub>AR antagonists for the treatment of Parkinson’s disease. More recently, the A<sub>2A</sub>AR has attracted additional attention for its roles in immuno-oncology, and a number of A<sub>2A</sub>AR antagonists are currently used as lead compounds for antitumor drugs in both preclinical models and clinical trials. This review surveys recent advances in the development of A<sub>2A</sub>AR antagonists for cancer immunotherapy. The therapeutic potential of representative A<sub>2A</sub>AR antagonists is discussed based on both animal efficacy studies and clinical data.
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