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Published on: July 8, 2020
Microangiopathy associated with poor outcome of immunoglobulin A nephropathy: a cohort study and meta-analysis
Lei Dong1, Yuncan Hu2, Dan Yang1
1Division of Nephrology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
Background:
Microangiopathy (MA) lesions are not rare in immunoglobulin A nephropathy (IgAN) and have been suggested to have a potential role in increasing risk in renal function decline. However, this suggestion has not been universally accepted. We aimed to investigate its role in our cohort and in multiple studies through a systematic meta-analysis.
Methods:
This cohort study included 450 IgAN patients, confirmed by renal biopsy, at Tongji Hospital, China, from January 2012 to December 2016. Clinical data were collected and analysed. We systematically searched PubMed and Web of Science for studies investigating the association between MA lesions and IgAN.
Results:
In our cohort, IgAN patients with MA were significantly older and had higher blood pressure, more proteinuria, worse kidney function and increased uric acid levels compared with patients without MA. When comparing pathological features with the non-MA group, the MA group exhibited more global glomerulosclerosis and interstitial fibrosis/tubular atrophy. MA lesions were independently associated with a composite kidney outcome in IgAN patients {adjusted hazard ratio 2.115 [95% confidence interval (CI) 1.035-4.320], P = .040}. Furthermore, this relationship was validated in a meta-analysis involving 2098 individuals from five independent cohorts. The combined data showed a 187% adjusted risk of poor renal outcome in IgAN patients with MA compared with patients without MA [adjusted risk ratio 2.87 (95% CI 2.05-4.02; I2 = 53%).
Conclusion:
MA lesions could serve as a valuable predictor for disease progression in patients with IgAN, extending beyond the widely recognized Oxford MEST-C score.
Insights
Microangiopathy (MA) lesions in immunoglobulin A nephropathy (IgAN) predict worse kidney outcomes. This finding was confirmed in a large meta-analysis, highlighting MA as a key risk factor for IgAN progression.
Area of Science:
- Nephrology
- Pathology
- Clinical Medicine
Background:
- Microangiopathy (MA) lesions are observed in IgA nephropathy (IgAN).
- Their role in IgAN progression and renal function decline is debated.
- This study investigates the association between MA and IgAN outcomes.
Purpose of the Study:
- To investigate the role of microangiopathy (MA) lesions in immunoglobulin A nephropathy (IgAN) progression.
- To analyze the association between MA and kidney outcomes in a Chinese cohort.
- To validate findings through a systematic meta-analysis.
Main Methods:
- A cohort study of 450 IgAN patients confirmed by renal biopsy.
- Clinical data collection and analysis.
- Systematic literature search of PubMed and Web of Science for relevant studies.
Main Results:
- IgAN patients with MA were older, with higher blood pressure, proteinuria, worse kidney function, and elevated uric acid.
- MA group showed more global glomerulosclerosis and interstitial fibrosis/tubular atrophy.
- MA lesions independently predicted adverse kidney outcomes (aHR 2.115) and were validated in a meta-analysis (aRR 2.87).
Conclusions:
- Microangiopathy lesions are significant predictors of disease progression in IgAN.
- MA offers prognostic value beyond the established Oxford MEST-C score.
- MA lesions are a valuable biomarker for identifying high-risk IgAN patients.
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