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Maintenance therapy with dose-adjusted 6-mercaptopurine in idiopathic pulmonary hemosiderosis

Xue-Qun Luo1, Zhi-Yong Ke1, Li-Bin Huang1

  • 1Department of Pediatric, The First Affiliated Hospital of Sun Yat-Sen University, Zhongshan Er Lu, Guangzhou 510080, China.

Pediatric Pulmonology
|October 31, 2008
PubMed

Insights

Idiopathic pulmonary hemosiderosis (IPH) in children can be challenging to diagnose and treat. Dose-adjusted 6-mercaptopurine (6MP) maintenance therapy may lead to steroid-free remission, with relative leukopenia as a predictor of response.

Area of Science:

  • Pediatric Pulmonology
  • Clinical Immunology
  • Pharmacology

Background:

  • Idiopathic pulmonary hemosiderosis (IPH) presents diagnostic and therapeutic challenges in children.
  • Delayed diagnosis is frequent due to the absence of the classical IPH triad in many pediatric cases.

Purpose of the Study:

  • To review IPH diagnosis in children.
  • To evaluate the efficacy of maintenance therapy with dose-adjusted 6-mercaptopurine (6MP) in pediatric IPH patients.

Main Methods:

  • Fifteen children with IPH were enrolled in the study.
  • Initial treatment involved prednisone (2 mg/kg/day) followed by a taper.
  • Maintenance therapy with 6MP (60 mg/m²/day) was administered for 3 years, with dose adjustments based on leukopenia.

Main Results:

  • All patients responded to initial prednisone treatment.
  • Patients with relative leukopenia on 6MP maintenance had significantly lower recurrence rates (1/8) compared to those without (5/7, P < 0.05).
  • Four of five patients who recurred became recurrence-free after upward dose adjustment of 6MP to maintain relative leukopenia.

Conclusions:

  • Children with IPH can achieve long-term, steroid-free remission with 6MP maintenance therapy.
  • Relative leukopenia during 6MP therapy may serve as a predictive marker for clinical response in pediatric IPH.

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