RBP4 and metabolic syndrome: The carrier state of the rs738409G allele of the PNPLA3 gene was not related with presumptive inflammatory markers, both direct (LBP, IL-6, and serum cystatin C), and inverse (prealbumin and RBP4), nor with metabolic parameters related to the metabolic syndrome (blood lipids, uric acid, serum ferritin, TSH, and T4) (data not shown).