Low-Molecular-Weight Proteins as Prognostic Markers in Idiopathic Membranous Nephropathy
Open Access
- 1 December 2011
- journal article
- Published by Ovid Technologies (Wolters Kluwer Health) in Clinical Journal of the American Society of Nephrology
- Vol. 6 (12), 2846-2853
- https://doi.org/10.2215/cjn.04020411
Abstract
Background Accurate prediction of prognosis in idiopathic membranous nephropathy (iMN) allows restriction of immunosuppressive therapy to patients at high risk for ESRD. Here we re-evaluate urinary low-molecular-weight proteins as prognostic markers and explore causes of misclassification. Design, setting, participants, & measurements In a cohort of 129 patients with serum creatinine concentration Results Median survival time was 25 months, and 47% of patients showed progression. The area under the receiver operating characteristic curve for uβ2m was 0.81 (95% CI: 0.73 to 0.89). Using a threshold value of 1.0 μg/min, sensitivity and specificity were 73% and 75%, respectively. Similar accuracy was observed for the uβ2m-creatinine ratio with sensitivity and specificity of 75% and 73%, respectively, at a threshold of 1.0 μg/10 mmol creatinine. Similar accuracy was found for uα1m and uα1m-creatinine ratio. Blood Pressure and cholesterol contributed to misclassification. Repeated measurements improved accuracy in patients with persistent proteinuria: the positive predictive value of uβ2m increased from 72% to 89% and the negative predictive value from 76% to 100%. Conclusions Urinary excretion of uα2m and uβ2m predict prognosis in iMN. A spot urine sample can be used instead of a timed sample. A repeated measurement after 6 to 12 months increases prognostic accuracy.Keywords
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