OLFM4 and chronic gastritis: We confirmed the up-regulation of LRP1 (Low density lipoprotein receptor-related protein 1), SLCO2A1 (Solute Carrier Organic Anion Transporter Family Member 2A1), and MUC17 (Mucin 17) in chronic gastritis and of PROM1 (Prominin 1), OLFM4 (Olfactomedin 4), and LGR5 (Leucine-rich repeat containing G protein-coupled Receptor 5) in intestinal metaplasia.