PTGS2 and non-small cell lung carcinoma: To determine whether the inhibitory effect of honokiol on NSCLC cell migration is mediated through its inhibitory effect on COX-2 expression, equal numbers of A549 and H1299 cells were subjected to the cell migration assay after treatment with various concentrations of celecoxib (0, 5, 10, 20 μM) for 24 h.