Thus, in order to investigate the expression and possible role of CEACAM6 in gastric mucosa carcinogenesis, the mRNA sequencing was performed on gastric mucosa specimens with CSG, CAG+IM, Dys, and Cancer, and the genes of CEA family member were verified by RT-qPCR method (only the data of CEACAM6 mRNA was showed). This evidence concerns the gene CEACAM5 and cancer.