MMP2 and non-small cell lung carcinoma: To elaborate on whether circ_0000517 affected NSCLC progressionthrough the circ_0000517-miR-326/miR-330-5p-MMP2 axis, miR-326/miR-330-5p inhibitors (orcontrol) were transfected into A549 and H1299 cells along withcirc_0000517 knockdown (Fig .5A).