CA9 and gastric cancer: Additionally, Liu et al. suggested that the expression levels of (ATPase H+/K + Transporting Subunit Alpha (ATP4A), carbonic anhydrase 9 (CA9), Fibrinogen Alpha Chain (FGA), Aldehyde Dehydrogenase 1 Family Member A1 (ALDH1A1), and Ghrelin And Obestatin Prepropeptide (GHRL) were reduced, whereas those of TIMP1, Secreted Phosphoprotein 1 (SPP1), CXCL8, Thy-1 Cell Surface Antigen (THY1), and COL1A1 were increased in GC.