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Serum Albumin at Partial Remission Predicts Outcomes in Membranous Nephropathy

Taewoo Lee1,2, Yunro Chung3,4, Caroline J Poulton1

  • 1UNC Kidney Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.

Kidney International Reports
|May 15, 2020
PubMed
Abstract

Insights

In primary membranous nephropathy, achieving partial remission (PR) with serum albumin above 3.5 g/dL reduces the risk of relapse and kidney failure. Normalizing albumin in PR may be a better indicator of recovery than current standards.

Area of Science:

  • Nephrology
  • Internal Medicine
  • Clinical Research

Background:

  • Primary membranous nephropathy (MN) patients achieving partial remission (PR) face higher risks of relapse and end-stage kidney disease (ESKD) than those in complete remission (CR).
  • Current definitions of PR may not fully capture long-term renal outcomes.
  • Identifying robust predictors of relapse and renal failure in PR is crucial for patient management.

Purpose of the Study:

  • To identify factors associated with relapse or renal failure in patients with primary membranous nephropathy who achieve partial remission.
  • To evaluate the prognostic significance of serum albumin levels at the time of partial remission.

Main Methods:

  • A cohort of 267 patients with MN and nephrotic syndrome was followed for over 12 months.
  • Data on partial remission (PR), complete remission (CR), relapse, and a composite of doubling serum creatinine or ESKD were collected.
  • Time-to-event analysis was used to assess characteristics at PR linked to the composite outcome or relapse.

Main Results:

  • Serum albumin at PR and duration of nephrotic proteinuria were independent risk factors for the composite endpoint (renal failure or doubling of creatinine).
  • Lower serum albumin at PR (<4.0 g/dL) and longer duration of proteinuria were associated with increased risk.
  • A serum albumin cutoff of ≤3.5 g/dL at PR best predicted relapse and the composite outcome.

Conclusions:

  • Patients achieving PR with serum albumin >3.5 g/dL exhibit a lower risk of adverse renal outcomes compared to those with lower albumin levels.
  • A revised definition of PR incorporating normalized serum albumin may serve as a more reliable surrogate endpoint in MN.
  • These findings suggest refining PR criteria to improve prediction of long-term kidney health in MN patients.
Keywords:
albuminemiamembranous nephropathynephrotic syndromeproteinuriaremissionsurrogate endpoint

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