"miR-431 expression was significantly lower in lung cancer (LCa) tissue samples or cell lines compared to adjacent normal tissues or lung bronchial epithelial cell line respectively. Overexpression of miR-431 significantly inhibited proliferation invasion and migration of A549 cells. Downregulation of miR-431 accelerated cell growth and metastasis of H1650 cells. DDX5 was proved to be a direct target for miR-431 in LCa."xsd:string