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Pathologic findings of initial biopsies reflect the outcomes of membranous nephropathy
Keiichi Yoshimoto1, Hitoshi Yokoyama, Takashi Wada
1Department of Gastroenterology and Nephrology, and Division of Blood Purification, Kanazawa University Graduate School of Medical Science, Kanazawa, Japan.
Background:
A considerable diversity of prognosis is seen with idiopathic membranous nephropathy (IMN). The initial factors affecting long-term outcome remain unclear.
Methods:
We studied retrospectively 105 patients with IMN who had been followed up for at least 5 years, or until end-stage renal failure (ESRF) (primary outcome), or death (secondary outcome). We analyzed the initial clinicopathologic factors affecting primary and secondary outcomes. We assigned the patients to two groups and one subgroup, based on the electron microscopic findings. The groupings were: homogeneous type with synchronous electron dense deposits; homogeneous type with large dense deposits (deep subgroup); and heterogeneous type with various phases of dense deposits.
Results:
No differences in the initial clinicopathologic states were seen between the homogeneous (N= 60) and heterogeneous types (N= 45), apart from hypertension and disease history before biopsy. In the homogeneous type, only one patient developed ESRF, which was drug-induced, and remission occurred earlier than in the heterogeneous type. With regard to secondary outcomes, increased age, male gender, heterogeneous type, and deep subgroup were independent risk factors. There were no significant differences attributable to therapeutic regime with respect to primary or secondary outcome in either group.
Conclusion:
Our results indicate that an electron microscopic classification, at initial biopsy, as heterogeneous type or deep subgroup type with dense deposits are independent indicators of poor prognosis in IMN.
Insights
Idiopathic membranous nephropathy (IMN) prognosis varies. Electron microscopy at biopsy, identifying heterogeneous or deep subgroup types, indicates a poorer outcome in IMN patients.
Area of Science:
- Nephrology
- Pathology
Background:
- Idiopathic membranous nephropathy (IMN) exhibits diverse prognoses.
- Initial factors influencing long-term outcomes in IMN are not well-defined.
Purpose of the Study:
- To identify initial clinicopathologic factors predicting long-term outcomes in idiopathic membranous nephropathy.
- To investigate the prognostic value of electron microscopic classifications in IMN.
Main Methods:
- Retrospective analysis of 105 IMN patients with a minimum 5-year follow-up or until end-stage renal failure (ESRF) or death.
- Patients were classified into homogeneous (synchronous deposits) and heterogeneous (various phases of deposits) types based on electron microscopy, with a deep subgroup identified within the homogeneous type.
- Clinicopathologic factors were analyzed for their association with primary (ESRF) and secondary (death) outcomes.
Main Results:
- No significant initial clinicopathologic differences between homogeneous and heterogeneous types, except for hypertension and prior disease history.
- The homogeneous type showed earlier remission and only one drug-induced ESRF case.
- Independent risk factors for poor prognosis included older age, male gender, heterogeneous type, and the deep subgroup. Treatment regimens did not significantly impact outcomes.
Conclusions:
- Electron microscopic classification at initial biopsy is crucial for predicting IMN prognosis.
- Heterogeneous type and deep subgroup classifications are independent indicators of poor prognosis in idiopathic membranous nephropathy.
