Prognostic Value of Tubulointerstitial Lesions, Urinary N-Acetyl-β-d-Glucosaminidase, and Urinary β2-Microglobulin in Patients with Type 2 Diabetes and Biopsy-Proven Diabetic Nephropathy

Clinical Journal of the American Society of Nephrology : CJASN
Koki MiseYoshifumi Ubara

Abstract

Some biomarkers of renal tubular injury are reported to be useful for predicting renal prognosis in the early stage of diabetic nephropathy (DN). Our study compared predictions of the renal prognosis by such biomarkers and by histologic tubulointerstitial damage. Among 210 patients with type 2 diabetes and biopsy-proven DN managed from 1985 to 2011, 149 patients with urinary N-acetyl-β-d-glucosaminidase (NAG) and urinary β2-microglobulin (β2-MG) data at the time of renal biopsy were enrolled. The primary outcome was a decline in eGFR of ≥50% from baseline or commencement of dialysis for ESRD. The median follow-up period was 2.3 years (interquartile range, 1.1-5.3), and the primary outcome was noted in 94 patients. Mean eGFR was 46.3±23.2 ml/min per 1.73 m(2), and 132 patients (89%) had overt proteinuria at baseline. Cox proportional hazards analysis revealed that the association of urinary NAG and β2-MG with the outcome was attenuated after adjustment for known promoters of progression (+1 SD for log NAG: hazard ratio [HR], 1.14; 95% confidence interval [95% CI], 0.84 to 1.55; +1 SD for log β2-MG: HR, 1.23; 95% CI, 0.94 to 1.62). In contrast, the interstitial fibrosis and tubular atrophy (IFTA) score was still significantly cor...Continue Reading

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