The potential for synergy between the co-administration of A2R antagonists with anti-PD-1 mAb is underscored by the observations that PD-1 blockade enhances A2AR expression on tumor-infiltrating CD8+ T cells (401), as well as that PD-1 blockade is more efficacious, in terms of increasing the survival of tumor-bearing mice, when these mice lack the A2AR (400). The gene discussed is CD8A; the disease is neoplasm.