miR-145 overexpression reduces the proliferative potential of A549 and H23 cells. (A) MTT assays reveal reduced cell growth for stable transfected cell lines compared to vector-transfected control. (B) Methylene blue-stained culture plates demonstrated no difference in adherent colony formation in six-well dishes. Values are means of three separate experiments ± SD. *P < 0.05 by Student's paired t-test compared to untreated cells (control).