An in vitro cell adhesion assay revealed that Cx43- and Cx43T154A-expressing BGC-823 and SGC-7901 cells exhibited more efficient adhesion to the mesothelial cell monolayers than empty vector cells and that the adhesion efficiency of Cx43T154A-expressing tumor cells was similar to Cx43-expressing cells. The gene discussed is GJA1; the disease is neoplasm.