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Membranous Nephropathy: Quantifying Remission Duration on Outcome

Daniel C Cattran1, Esther D Kim2, Heather Reich2

  • 1Division of Nephrology, Department of Medicine, University Health Network, University of Toronto, Toronto, Ontario, Canada; and daniel.cattran@uhn.ca.

Journal of the American Society of Nephrology : JASN
|November 1, 2016
PubMed

Insights

Remission duration, including partial remission (PR) and complete remission (CR), is a valuable predictor of long-term kidney outcomes in membranous nephropathy (MGN). Even short durations of remission significantly improve renal prognosis compared to relapse.

Area of Science:

  • Nephrology
  • Internal Medicine
  • Clinical Research

Background:

  • Proteinuria changes are used as surrogates for prognosis in membranous nephropathy (MGN).
  • Variability and lag in proteinuria levels limit its utility as a prognostic marker.
  • Prognostic significance of remission duration in idiopathic/primary MGN requires further investigation.

Purpose of the Study:

  • To examine the prognostic significance of remission duration in patients with biopsy-proven idiopathic/primary membranous nephropathy (MGN).
  • To validate and quantify partial remission (PR) and complete remission (CR) as surrogates for long-term outcomes in MGN.

Main Methods:

  • A cohort study of 376 patients with biopsy-proven idiopathic/primary MGN who achieved remission.
  • Defined CR (≤0.3 g/d), PR (0.4-3.4 g/d), and relapse (≥3.5 g/d) based on proteinuria levels.
  • Used Cox proportional hazards models to assess remission status at 3, 6, 12, 24, and 36 months against the primary outcome (ESRD or 50% eGFR reduction).

Main Results:

  • Persistent remission was associated with significantly reduced risk of the primary outcome across all landmark time points after adjustment.
  • Unadjusted hazard ratios for the primary outcome ranged from 0.35 to 0.56 across landmarks.
  • Durable remissions, even as short as 3 months, were linked to improved renal survival compared to relapse.

Conclusions:

  • Remission duration, encompassing both PR and CR, is a validated and quantifiable surrogate for long-term renal outcomes in MGN.
  • Maintaining remission, regardless of duration, is associated with better renal prognosis.
  • This study supports the use of remission status as a reliable predictor of kidney survival in MGN patients.
Keywords:
clinical nephrologyglomerulonephritismembranous nephropathyproteinuriarenal progressionsurvival

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