MMP9 and lung adenocarcinoma: Furthermore, miR-145 inhibited cell proliferation and promoted cell apoptosis through negatively regulating mTOR signaling pathway and decreasing MMP-2 and MMP-9 expression, the Bax/Bcl-2 ratio and the activity of the caspase-3 cascade in human lung adenocarcinoma A549 cells [36, 37].