PDCD1 and neoplasm: Interestingly, we found a similar correlation pattern between immune modulators and PD-1 across 30 tumor types in which the majority of immunoinhibitors and immunostimulators were correlated with PD-1 positively (Figures S2 and S3), while only a small number of immunoinhibitors and immunostimulators were negatively correlated with PD-1.