FOLR2 and kidney disorder: The level in urine of angiopoetin-like 4 (Angptl4), L-selectin, tripeptidyl peptidase 1 (TPPI), transforming growth factor-β1 (TGFβ1), thrombospondin-1, folate receptor beta (FOLR2), platelet-derived growth factor receptor-β, and peroxiredoxin 2 (PRX2) allowed to differentiate between active and inactive renal disease.