Abstract
In two previous randomized controlled trials we showed that treatment of severe childhood immunoglobulin A nephropathy (IgA-N) using prednisolone, azathioprine, heparin–warfarin, and dipyridamole prevented any increase of sclerosed glomeruli and that prednisolone alone did not prevent a further increase of sclerosed glomeruli. Accordingly, the immunosuppressant is considered to be important. Often, however, we were unable to complete azathioprine regimen due to toxicity. Therefore, a different but effective immunosuppressant may be worth trying. Mizoribine, like azathioprine, is an antimetabolite that exerts its immunosuppressant effect by inhibiting lymphocyte proliferation. In this pilot study, we administered mizoribine instead of azathioprine as part of the combination therapy for treating 23 children with severe IgA-N and evaluated the efficacy and safety. Eighteen patients reached the primary endpoint (urine protein/creatinine ratio <0.2) during the 2-year treatment period. The cumulative disappearance rate of proteinuria determined by Kaplan–Meier was 80.4%. Median protein excretion was reduced from 1.19 g/m2/day to 0.05 g/m2/day (p < 0.0001). After treatment, the median percentage of glomeruli showing sclerosis was unchanged in comparison with that before treatment. No patients required a change of treatment. In conclusion, the efficacy and safety of the mizoribine combination seems to be acceptable for treating children with severe IgA-N.
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Acknowledgments
This study was supported in part by Health and Labor Sciences Research Grants (Research on Children and Families) from the Japanese Ministry of Health Labor and Welfare and in part by a research grant from Asahi Kasei Pharma.
Part of this study was presented in the 14th Congress of IPNA, Budapest, Hungary, 2007, and the 40th Annual Meeting of the ASN, San Francisco, CA, USA, 2007, and was published in abstract form (J Am Soc Nephrol 18:559A, 2007).
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Appendix
Appendix
The Japanese Pediatric IgA Nephropathy Treatment Study Group
Coordinating committee: H. Ito (Tokyo), N. Yoshikawa (Wakayama).
Statistics committee: T. Kawamura (Nagoya).
Investigators: S. Hoshii (Sapporo); K. Kawamura (Sakura); M. Honda, M. Ikeda, H. Hataya, K. Ishikura, K. Iijima, (Tokyo); S. Ito (Yokohama); K. Nakanishi (Wakayama); K. Nozu (Kobe); A. Furuse (Kumamoto).
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Yoshikawa, N., Nakanishi, K., Ishikura, K. et al. Combination therapy with mizoribine for severe childhood IgA nephropathy: a pilot study. Pediatr Nephrol 23, 757–763 (2008). https://doi.org/10.1007/s00467-007-0731-8
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DOI: https://doi.org/10.1007/s00467-007-0731-8