In order to investigate the effects of CDH1 and lncRNA H19 on the proliferation and apoptosis of lung adenocarcinoma cells, we transfected the previously constructed plasmids into A549 cells, followed by sphere‐forming assay, CCK‐8 assay and flow cytometry (Figure 4A,C,E,F). The gene discussed is H19; the disease is lung adenocarcinoma.