IVS assays were performed as described previously (8 (link)). Briefly, PBMCs were stimulated for 6 d in the presence of 10 μg/ml anti-IL-10R and/or anti-PD-1 (clone EH12.2H7, Biolegend) blocking mAb or isotype control antibodies prior to intracellular cytokine staining. Alternatively, cells were harvested and then surface stained with APC-labeled A2/NY-ESO-1 tetramers, and subsequently with CD8-PECy7 and Annexin V-FITC (ApoScreen Annexin V-FITC Apoptosis Kit, Beckman Coulter).