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IgA nephropathy. Evaluation of prognostic factors in patients with moderate disease
1Department of Pathology, University of British Columbia, Shaughnessy Hospital, Vancouver, Canada.
Insights
In IgA nephropathy (IgAN) patients with moderate disease, high proteinuria and segmental glomerulosclerosis predict poor kidney survival. These factors are key for understanding IgAN progression in affected individuals.
Area of Science:
- Nephrology
- Immunology
- Pathology
Background:
- Previous IgA nephropathy (IgAN) studies identified prognostic factors across the full disease spectrum.
- The applicability of these factors to IgAN patients with moderate disease (Grade III) remained unclear.
Purpose of the Study:
- To evaluate prognostic clinical and pathological factors in IgA nephropathy patients with moderate histological disease.
- To determine which factors predict renal survival in this specific patient cohort.
Main Methods:
- Retrospective analysis of 40 IgA nephropathy patients (Grade III).
- Evaluation included clinical data (age, sex, hematuria, hypertension, proteinuria, creatinine) and biopsy findings (segmental glomerulosclerosis, IgG/IgM deposits, crescents, vascular sclerosis).
- Renal survival rates were calculated using life table analysis.
Main Results:
- Proteinuria (≥2.0 g/24 h) and extent of segmental glomerulosclerosis (>10% glomeruli) were significant predictors of poor renal survival (p<0.05 and p<0.025, respectively).
- 60-month and 100-month renal survival rates were 96% and 52%, respectively.
- Other evaluated factors like age, sex, hematuria, hypertension, and crescents did not show prognostic significance in this group.
Conclusions:
- Degree of proteinuria and extent of segmental glomerulosclerosis are crucial prognostic indicators in IgA nephropathy patients with moderate disease.
- These findings help refine risk stratification and management strategies for IgAN patients with specific histological characteristics.
Abstract:
Previous studies of IgA nephropathy have demonstrated a number of prognostically significant clinical and pathological factors in groups of patients with the full histological spectrum of the disease. Whether these factors can be applied to a group of IgA nephropathy patients with disease of moderate degree is unknown. Forty patients (9 females, 31 males) with grade III IgA nephropathy (no more than 10% obsolete glomeruli and little or no interstitial fibrosis) were evaluated with respect to age, sex, degree of proteinuria, history of recurrent gross hematuria, hypertension, extent and type of segmental glomerulosclerosis, demonstration of IgG and/or IgM in deposits, presence of peripheral capillary deposits, whether or not there were crescents, and extent of vascular sclerosis. The mean age was 29.6 +/- (SD) 13.1 years. Sixteen patients presented with recurrent gross hematuria, and 24 had microscopic hematuria and proteinuria as the initial manifestation. Hypertension was seen in 5 patients. The mean serum creatinine concentration was 1.09 +/- 0.47 mg/dl (96.4 +/- 41.5 mumol/l), and the mean 24-hour urinary protein was 1.5 +/- 1.3 g. Nine patients had proteinuria greater than or equal to 2.0 g/24 h. Thirty-two patients demonstrated segmental glomerulosclerosis in their biopsies, 13 of which had more than 10% of the glomeruli involved. Seven patients developed established renal failure (Cr greater than or equal to 2.0 mg/dl; 176.8 mumol/l). The 60-and 100-month renal survival rates were 96 and 52%. Life table analysis disclosed that only the degree of proteinuria (greater than or equal to 2.0 g/24 h; p less than 0.05) and the extent of segmental glomerulosclerosis (p less than 0.025) were of prognostic significance.(ABSTRACT TRUNCATED AT 250 WORDS)