PDCD1 and gastric adenocarcinoma: To examine the associations between TMEM119 and immune checkpoint molecules in STAD, the expression of immune checkpoint genes (PDCD1, neuropilin 1 [NRP1], toll like receptor 4 [TLR4], and hepatitis A virus cellular receptor 2 [HAVCR2]) and TMEM119 were analysed by Peason’s correlation coefficient.