Here, on the basis of the association of COX-2 expression with VEGF in both NSCLC tumor tissues and cell lines, we treated NSCLC cells with concentrations of COX-2 sufficient to up-regulate VEGF expression and evaluated the signaling pathways that linked COX-2 stimulation with VEGF up-regulation. This evidence concerns the gene PTGS2 and non-small cell lung carcinoma.