Maciejczyk et al. showed that in children with hypertension, activities of SOD, CAT, and peroxidase, as well as the level of advanced glycation end products, MDA concentration, and nitrosative stress markers (peroxynitrite and nitrotyrosine), were significantly higher in non-stimulated and stimulated whole saliva and erythrocytes [56]. This evidence concerns the gene CAT and hypertensive disorder.