Effect of over-expression or knockdown of miR-18a on proliferation, apoptosis and migration of ASMC intervened by PDGF-BB. A) MTT assay outcome on cell proliferation in each group, B) Flow cytometry detection of apoptosis in each treatment group, C) Quantitative analysis by flow cytometry. D) Transwell detection of cell migration in each treatment group. E) Quantitative analysis of transwell detection. *P<0.05, **P<0.01, ***P<0.001.