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Effect of oral mizoribine pulse therapy for frequently relapsing steroid-dependent nephrotic syndrome

M Fujieda1, M Ishihara, T Morita

  • 1Department of Pediatrics, Kochi University Medical School, Kochi, Japan. fujiedam@kochi-u.ac.jp

Clinical Nephrology
|April 10, 2008
PubMed
Abstract

Insights

Oral mizoribine (MZB) pulse therapy effectively reduced relapse frequency in children with frequently relapsing steroid-dependent nephrotic syndrome (FR-SDNS). This treatment also lowered the need for prednisolone (PSL), particularly in older pediatric patients.

Area of Science:

  • Nephrology
  • Immunosuppressive Therapy
  • Pediatric Nephrology

Background:

  • Frequently relapsing steroid-dependent nephrotic syndrome (FR-SDNS) poses a significant challenge in pediatric care.
  • Steroid-sparing agents are crucial for managing FR-SDNS and minimizing steroid-related toxicities.

Purpose of the Study:

  • To assess the efficacy of oral mizoribine (MZB) administered twice weekly as pulse therapy for FR-SDNS.
  • To evaluate the impact of MZB pulse therapy on relapse rates and prednisolone (PSL) dosage in pediatric patients.

Main Methods:

  • A Phase II trial involving 16 pediatric patients diagnosed with FR-SDNS.
  • MZB dosage was titrated to achieve a target peak blood level of approximately 3 microg/ml.
  • Therapeutic outcomes were evaluated by comparing relapse incidence and daily PSL requirements pre- and post-therapy.

Main Results:

  • MZB pulse therapy significantly reduced the annual relapse rate (2.4 vs. 3.4 times/year, p < 0.05).
  • A trend towards lower daily PSL dosage was observed post-therapy (0.39 vs. 0.47 mg/kg/d; not significant).
  • PSL discontinuation was achieved in 6 of 12 patients with reduced relapse rates; older patients and higher MZB concentrations correlated with better outcomes.

Conclusions:

  • Oral MZB pulse therapy is an effective treatment for decreasing relapse frequency in pediatric FR-SDNS.
  • The therapy shows potential for reducing PSL dosage, especially in older pediatric patients.
  • MZB pulse therapy was well-tolerated with no observed adverse effects.

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