PDCD1 and gastric cancer: Lastly, we also evaluated the role of CD8 PD-1 positivity in gastric cancer in non-Asian patients using RNAseq data from the TCGA dataset [25] which sequenced tumors from treatment naïve gastric cancer and showed similar trends to improved overall survival with high PDCD1 and CD8A expression (HR 0.711, p = 0.054, Supplementary Fig. 4).