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Electron-dense deposition patterns and the outcomes of idiopathic membranous nephropathy in Japanese
Hitoshi Yokoyama1, Keiichi Yoshimoto, Takashi Wada
1Division of Blood Purification, Department of Gastroenterology and Nephrology, Graduate School of Medical Science, Kanazawa University, 13-1 Takara-machi, Kanazawa 920-8641, Japan. dialysis@medf.m.kanazawa-u.ac.jp
Abstract:
A considerable diversity in prognosis is seen with membranous nephropathy (MN). In terms of pathological findings, the presence of tubulointerstitial lesions was emphasized as a poor prognostic factor. However, the glomerular factors affecting the long-term outcome of idiopathic human MN have remained unclear. We reviewed the initial clinicopathological factors affecting the primary and secondary outcomes in 105 patients with primary MN, as well as reviewing previous reports. Based on electron microscopic (EM) findings, we could divide patients into two subtypes and one subgroup; i.e., homogeneous type with a synchronous phase of electron-dense deposits, with large dense deposits (deep subgroup) and heterogeneous type with various phases of dense deposits. The homogeneous type showed no endstage renal failure, and had earlier remission as compared with the heterogeneous type. For the secondary outcome, heterogeneous type and deep subgroup were also independent risk factors. However, there was no significant difference in the final primary or secondary outcome for any treatment subgroups. These results indicated that our category of EM findings was a beneficial marker of the primary and secondary outcomes in MN; the homogeneous type of MN with synchronous phase of electron-dense deposits (except for the "deep" subgroup) had a good outcome.
Insights
Electron microscopy findings in membranous nephropathy (MN) predict patient outcomes. The homogeneous type of MN generally indicates a good prognosis, while the heterogeneous type suggests a poorer outcome.
Area of Science:
- Nephrology
- Pathology
- Electron Microscopy
Background:
- Membranous nephropathy (MN) exhibits variable prognoses.
- Tubulointerstitial lesions are known poor prognostic indicators in MN.
- Glomerular factors influencing long-term outcomes in idiopathic MN remain poorly understood.
Purpose of the Study:
- To identify initial clinicopathological factors predicting primary and secondary outcomes in primary MN.
- To investigate the utility of electron microscopic findings in stratifying MN patient prognosis.
Main Methods:
- Retrospective review of 105 patients with primary MN.
- Classification of patients into subtypes based on electron microscopy (EM) findings of electron-dense deposits.
- Analysis of clinicopathological factors and patient outcomes (primary and secondary).
Main Results:
- Patients were categorized into homogeneous and heterogeneous types based on EM findings.
- The homogeneous type demonstrated no end-stage renal failure and earlier remission compared to the heterogeneous type.
- Heterogeneous type and a specific subgroup ('deep') were identified as independent risk factors for secondary outcomes.
Conclusions:
- Electron microscopy-based classification is a valuable prognostic marker for membranous nephropathy.
- The homogeneous type of MN, excluding the 'deep' subgroup, is associated with a favorable prognosis.
- Treatment subgroups did not significantly alter the observed primary or secondary outcomes based on EM classification.
