H19 and intraepithelial neoplasia: To verify the expression of the six differentially expressed lncRNAs identified by sequencing analysis, we used RT-qPCR to evaluate the expression levels of lncRNA H19, LINC00895, lnc-SRGAP2C-16, lnc-HLA-C-2, lnc-APOC1-1, and lnc-B3GALT2-1 in 15 samples of chronic non-atrophic gastritis (gastritis), gastric mucosal low-grade/high-grade intraepithelial neoplasia (GIN), and GC (Gastric Cancer) tissues.