Firstly, to determine the differential expression of GCSC markers, the mRNA expression of EPCAM, ICAM1, ALDH1, THY1, PROM1, TFRC, CD24, OCT4, SOX2, LGR5, NANOG, ABCB1, ABCG2, CXCR4, ALCAM, DCLK1, ITGA6, and MSI1 in GC and normal stomach tissues were analyzed using the Oncomine and GEPIA databases, respectively. The gene discussed is THY1; the disease is gastric cancer.