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The long-term outcome of idiopathic membranous nephropathy
Abstract:
Thirty-five consecutive patients with renal biopsy appearances of idiopathic membranous nephropathy, who were initially studied between 1960 and 1969, were reevaluated in 1979 to determine (a) the long-term outcome of idiopathic membranous nephropathy, and (b) whether any clinical or biopsy features at onset would permit prediction of long-term outcome. After fifteen years, actuarial analysis showed that approximately half the patients would be in remission; the rest dead or on dialysis/transplantation programs. Entry into renal failure, in those who ran this course, started at three years after diagnosis and continued steadily for at least another ten years. Likewise, remission was seen as early as one year from onset, but patients were still going into remission after thirteen years of proteinuria. No feature in the glomeruli predicted outcome, but interstitial and vascular changes were seen more frequently in those whose disease persisted or worsened. No onset feature predicted a poor outcome reliably, but younger patients did better than older, and all three children with initial macroscopic hematuria went into remission.
Insights
Idiopathic membranous nephropathy has a variable long-term outcome, with about half of patients achieving remission within fifteen years. Early clinical or biopsy features did not reliably predict prognosis in this cohort study.
Area of Science:
- Nephrology
- Internal Medicine
- Pathology
Background:
- Idiopathic membranous nephropathy (IMN) is a primary glomerular disease.
- Long-term prognosis and predictive factors for IMN remain incompletely understood.
Purpose of the Study:
- To determine the long-term outcome of idiopathic membranous nephropathy.
- To identify clinical or biopsy features at onset that predict long-term outcome.
Main Methods:
- Retrospective cohort study of 35 patients with IMN diagnosed between 1960-1969.
- Reevaluation in 1979 to assess long-term outcomes.
- Actuarial analysis of remission, death, and renal failure rates.
- Correlation of initial clinical and biopsy findings with outcomes.
Main Results:
- After 15 years, approximately 50% of patients achieved remission.
- Renal failure developed in the other 50%, starting around 3 years post-diagnosis.
- Remissions and progression continued for over 13 years.
- Glomerular features did not predict outcome; interstitial/vascular changes were associated with worse prognosis.
- Younger age and macroscopic hematuria in children were associated with better outcomes.
Conclusions:
- Idiopathic membranous nephropathy has a protracted course with significant long-term variability.
- Interstitial and vascular changes on biopsy may indicate a poorer prognosis.
- Predicting individual patient outcomes based on initial presentation remains challenging.