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The clinicopathological characteristics of IgA nephropathy in Hong Kong
K N Lai1, F Mac-Moune Lai, P K Li
1Department of Medicine, Chinese University of Hong Kong.
Insights
This study reviews IgA nephropathy in Chinese patients, finding unique features like no male predilection and a significant pediatric presence. Hepatitis B virus infection may also play a role in disease development.
Area of Science:
- Nephrology
- Immunology
- Hepatology
Background:
- Immunoglobulin A (IgA) nephropathy is a common primary glomerulonephritis.
- Understanding ethnic-specific features is crucial for accurate diagnosis and management.
Purpose of the Study:
- To identify clinicopathologic features of IgA nephropathy specific to Chinese patients.
- To investigate the role of hepatitis B virus (HBV) in IgA nephropathy pathogenesis.
Main Methods:
- Retrospective review of clinicopathologic data from 237 Chinese patients with IgA nephropathy.
- Analysis of patient demographics, clinical manifestations, and renal biopsy findings.
- Assessment of hepatitis B virus carrier status and renal viral antigen presence.
Main Results:
- IgA nephropathy is prevalent in the 26-35 age group, with 11% of patients being children.
- Unlike Caucasian populations, a male predilection was not observed (male:female ratio 0.94).
- Common manifestations include microscopic hematuria (25%), macroscopic hematuria (19%), and nephrotic syndrome (15%).
- Proteinuria did not correlate with prognosis; a subset of nephrotic patients showed steroid responsiveness, suggesting a variant.
- Hepatitis B virus carriers (17%) frequently showed viral antigens in renal biopsies (61%), indicating a potential pathogenetic role.
Conclusions:
- IgA nephropathy in Chinese patients exhibits distinct demographic and clinical characteristics compared to Western populations.
- Hepatitis B virus infection may contribute to the pathogenesis of IgA nephropathy in a subset of patients.
- Further research is warranted to explore the steroid-responsive variant and the precise role of HBV.
Abstract:
The clinicopathologic data of 237 Chinese patients with IgA nephropathy from Hong Kong are reviewed in an attempt to identify the features pertinent to Chinese patients. Although the nephropathy is commonest in the 26-35 year age group, 11% of the IgA nephritic patients were children below 16 years. The male predilection reported in Caucasian populations is not observed and the male:female ratio is 0.94 in our series. The commonest renal manifestation is microscopic hematuria (25%) and 19% of the patients present with macroscopic hematuria, not infrequently synpharyngitic. Nephrotic syndrome occurs in 15% of our patients and proteinuria more than 1 gm/day is documented in 58% of these IgA nephritic patients. The degree of proteinuria does not correlate with prognosis. A small proportion of these nephrotic patients respond to steroid therapy, suggesting a variant of IgA nephropathy that resembles lipoid nephrosis in its steroid-responsiveness. Seventeen percent of the patients (18/104) are hepatitis B virus carriers and 61% of these patients demonstrate viral antigens in their renal biopsies, indicating that hepatitis B virus infection may sometimes play a pathogenetic role.