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Effectiveness and nephrotoxicity of a 2-year medium dose of cyclosporine in pediatric patients with steroid-dependent nephrotic syndrome: determination of the need for follow-up kidney biopsy

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Abstract

Background

High dose of cyclosporine (CyA) for ≥2 years in children with steroid-dependent nephrotic syndrome (SDNS) increases the risk for nephropathy. Considering this, risk can be lowered with lower doses of CyA; we evaluated the effects of a medium dose of CyA, with target serum level, C2, of 450 ng/ml, over a 2-year period of observation, to determine the need for follow-up kidney biopsy.

Methods

We retrospectively evaluated C2 levels in 38 patients (17 males, 5.2 ± 2.9 years old) with SDNS at treatment initiation, at 6, 12 and 18 months during treatment, and at the time of kidney biopsy, 2-year after treatment initiation. Fifteen patients were also treated with mizoribine or mycophenolate mofetil. A number of relapses-per-patient-per-year, relative to SDNS onset and initiation of CyA treatment, were evaluated. Serum levels of total protein, albumin and total cholesterol, blood urea nitrogen level, and the estimated glomerular filtration rate were measured at treatment initiation and at 1- and 2-year post-treatment initiation.

Results

Only one very mild case of CyA-associated nephrotoxicity was identified based on biopsy results at 2-year post-treatment initiation. C2 concentrations were maintained at 422.2 ± 133.5 ng/ml and the number of relapses decreased from 3.0 relapses-per-patient-per-year prior to CyA treatment to 0.47 relapses-per-patient-per-year after CyA treatment. No effects of the treatment on the estimated glomerular filtration rate were noted.

Conclusion

A 2-year treatment with a medium dose of cyclosporine A with or without other immunosuppressive agents is relatively safe with regard to the development of cyclosporine A nephrotoxicity.

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Correspondence to Yoshiyuki Kuroyanagi.

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Conflict of interest

The authors declare that no conflict of interest exists.

Research involving human participants

All procedures involving human participants were in accordance with the ethical standards of the institution at which the studies were conducted (IRB approval number #201611 at Aichi Children’s Health and Medical Center, #1118 at the Japanese Red Cross Nagoya Daini Hospital, and #2094 at Seirei Hamamatu General Hospital) and with standards of the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed consent

Due to the retrospective nature of our study, an opt-out for informed consent was granted.

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Kuroyanagi, Y., Gotoh, Y., Kasahara, K. et al. Effectiveness and nephrotoxicity of a 2-year medium dose of cyclosporine in pediatric patients with steroid-dependent nephrotic syndrome: determination of the need for follow-up kidney biopsy. Clin Exp Nephrol 22, 413–419 (2018). https://doi.org/10.1007/s10157-017-1444-3

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  • DOI: https://doi.org/10.1007/s10157-017-1444-3

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