- BREN MATTISON Y, Meyer A, Van Putten V, Li H, Kuhn K, Stearman R, et al. Antitumorigenic effects of peroxisome proliferator-activated receptor-gamma in non-small-cell lung cancer cells are mediated by suppression of cyclooxygenase-2 via inhibition of nuclear factor-kappaB. Mol Pharmacol. 2008;73:709-17 pubmed..These data indicate that high levels of PGE(2) as a result of elevated COX-2 expression are critical for promoting lung tumorigenesis and that the antitumorigenic effects of PPARgamma are mediated in part through blocking this pathway. ..