We likewise selected several lung cancer cell lines (A549, NCI-H2009, and PC9) for experimental validation in vitro, with bronchial epithelioid cell (HBE) as the control group, and the result suggested that the expression of MIR31HG was also enhanced in lung cancer cell lines compared with the control group (Figure 7I). The gene discussed is MIR31HG; the disease is lung carcinoma.