['Metabolic syndrome contributes to the development of albuminuria and to the decrease of glomerular filtration rate (GFR) in type 2 diabetes patients. The aim of this study was to analyze the effect of MS treatment on the progression of diabetic nephropathy (DN).', 'This was a retrospective and comparative cohort study. Baseline and follow-up data related to the presence of metabolic syndrome, microalbuminuria (mA), and GFR were obtained in individuals with type 2 diabetes. Subjects were classified in two groups: (1) With correction of metabolic syndrome and (2) without correction of metabolic syndrome at follow-up. Furthermore, they were stratified in four subgroups: (A) Without metabolic syndrome at baseline and at follow-up, (B) with metabolic syndrome and correction of metabolic syndrome, (C) without metabolic syndrome and development of metabolic syndrome, and (D) with metabolic syndrome and persistence of metabolic syndrome.', 'Final GFR and mA were lower and higher, respectively, in group 2 versus 1 [89.8±3 2.3 vs. 98.3±32.0\u2009mL/min, P=0.010, and 51.0 (13.5-195) vs. 7.9 (4-31) mg/day, P<0.001, respectively]. Lack of metabolic syndrome correction [hazard ratio (HR)=2.8, 95% confidence interval (CI) 1.9-4.2, P<0.001], being in subgroups C (HR=2.05, 95% CI 1.03-4.1, P=0.04) and D (HR=3.3, 95% CI 2.0-5.3, P<0.001), and the presence of two (HR=3.4, 95% CI 1.9-6.1, P<0.001), three (HR=5.0, 95% CI 2.5-9.9, P<0.001), and four (HR=4.2, 95% CI 1.5-12.1, P=0.006) metabolic syndrome components were independent factors associated with development of mA in Cox regression analysis adjusted for age, gender, baseline mA and GFR, glycosylated hemoglobin (HbA1c), hypertension, and obesity.'] Does treatment of metabolic syndrome slow progression of diabetic nephropathy?