However, the relevance of malondialdehyde as a marker of oxidative stress which is generated by peroxidation of unsaturated fats as well as the role of matrix metalloproteinase-9 in atherosclerosis progression in patients (pts) with chronic kidney disease (CKD) not yet on dialysis compared to patients on peritoneal dialysis is less known, particularly with respect to cardiometabolic syndrome. This evidence concerns the gene MMP9 and atherosclerosis.