PTGS2 and gastric adenocarcinoma: Further Cao et al. reported that canolol, an antioxidant prevent the incidence of H. pylori associated gastric adenocarcinomas by scavenging oxygen radicals and reducing the levels of cyclooxygenase-2 (COX-2), inducible nitric oxide synthase (iNOS), and serum 8-hydroxy-2’-deoxyguanosine (8-OHdG) in gerbils (Cao et al., 2008).