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      Remission of proteinuria improves prognosis in IgA nephropathy.

      Journal of the American Society of Nephrology : JASN

      Remission Induction, Treatment Outcome, Female, Glomerular Filtration Rate, Glomerulonephritis, IGA, Aged, diagnosis, therapy, urine, Humans, Kidney, pathology, Male, Middle Aged, Multivariate Analysis, Prognosis, Proteinuria, Adolescent, Adult

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          Abstract

          Proteinuria has been shown to be an adverse prognostic factor in IgA nephropathy. The benefit of achieving a partial remission of proteinuria, however, has not been well described. We studied 542 patients with biopsy-proven primary IgA nephropathy in the Toronto Glomerulonephritis Registry and found that glomerular filtration rate (GFR) declined at -0.38 +/- 0.61 ml/min per 1.73 m2/mo overall, with 30% of subjects reaching end-stage renal disease. Multivariate analysis revealed that proteinuria during follow-up was the most important predictor of the rate of GFR decline. Among the 171 patients with <1 g/d of sustained proteinuria, the rate of decline was 90% slower than the mean rate. The rate of decline increased with the amount of proteinuria, such that those with sustained proteinuria >3 g/d (n = 121) lost renal function 25-fold faster than those with <1 g/d. Patients who presented with > or =3 g/d who achieved a partial remission (<1 g/d) had a similar course to patients who had < or =1 g/d throughout, and fared far better than patients who never achieved remission. These results underscore the relationship between proteinuria and prognosis in IgA nephropathy and establish the importance of remission.

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          Journal
          10.1681/ASN.2007050526
          17978307

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