FGF21 and diabetic kidney disease: The persistent predictability of the renal events by FGF-21 more than 1.40 pg/dl in the model 3 of regression and consistent associations with FGF-21 ≥1.40 pg/dl and the renal outcomes of the subjects with and without the use of RAS blockades proved that 1.40 pg/dl of FGF-21 can be a threshold to determine whether the subjects with an intensive management of the DKD were at a risk of the occurrence of the renal events or not.