PDCD1 and neoplasm: Except for identifying a negative correlation between the release of IFN-γ in ascites and PD-1 expression among ascites-derived CD4+ T-cells (r = −0.51, p = 0.044) (Supplementary Figure 2), no other correlations between PD-1 expression on CD4+ or CD8+ T-cells and IFN-γ release were found in the different sample types (blood, ascites, and tumor).