AQP9 and gastric adenocarcinoma: The genes correlated with AQP9 were significantly enriched in pathways like ‘Natural killer cell mediated cytotoxicity’ in BRCA; ‘Leukocyte transendothelial migration’ in COAD; ‘T cell receptor signaling pathway’ in LUAD; ‘Toll-like receptor signaling pathway’ in LUSC; and ‘Chemokine signaling pathway’ in STAD.