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  • Title: Evaluation of appropriate treatment for IgA nephropathy with mild proteinuria and normal renal function.
    Author: Ogura S, Moriyama T, Miyabe Y, Karasawa K, Nitta K.
    Journal: Clin Exp Nephrol; 2021 Oct; 25(10):1103-1110. PubMed ID: 34101029.
    Abstract:
    BACKGROUND: Tonsillectomy and steroid pulse therapy (TSP) for immunoglobulin A nephropathy (IgAN) is frequently employed in many Japanese institutions; however, performing this invasive treatment in patients with mild IgAN is controversial. This study aimed to evaluate the appropriate treatment for IgAN patients with mild proteinuria. METHODS: In this retrospective cohort analysis, 122 IgAN patients with mild proteinuria (0.5-1.0 g/day) and estimated glomerular filtration rate of ≥ 60 mL/min/1.73 m2 were classified into three groups as follows: patients treated with TSP (n = 32), oral prednisolone (oPSL, n = 33), and conservative therapy (CONS, n = 47). The clinical and histological backgrounds, 5-year remission rates of urinary findings, and 10-year renal survival rates were analyzed. RESULTS: The backgrounds were similar among the three groups. The remission rates of hematuria, proteinuria, and both were significantly higher for TSP and oPSL than for CONS; however, they were similar for TSP and oPSL. In the multivariate Cox regression analysis, TSP and oPSL were independent factors for the remission of urinary findings compared with CONS; however, the relapse rates of urinary abnormalities were similar among the three groups. No patient progressed to end-stage renal disease (ESRD) within 10 years. Adverse effects of corticosteroid therapy were significantly more frequent in oPSL than in TSP. CONCLUSION: In IgAN patients with mild proteinuria and stable renal function, similar to oPSL, TSP showed higher remission rates of hematuria and/or proteinuria than CONS, and no case progressed to ESRD regardless of the treatment methods. Therefore, appropriate treatments should be carefully considered for each patient.
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