Optimizing Hydroxyurea use in children with sickle cell disease: low dose regimen is effective

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Sharef Waadallah Sharef1, Maya Al-Hajri, Ismail Beshlawi

  • 1Department of Child Health, Sultan Qaboos University Hospital, Muscat, Oman.

European Journal of Haematology
|March 16, 2013
PubMed

Insights

A lower initial dose of hydroxyurea (HU) in sickle cell disease (SCD) patients is safe and effective. This approach achieved similar clinical benefits to higher doses, reducing vaso-occlusive crises and acute chest syndrome.

Area of Science:

  • Hematology
  • Pediatric Medicine
  • Pharmacology

Background:

  • Hydroxyurea (HU) is the standard treatment for severe sickle cell disease (SCD) in children.
  • Standard HU dosing ranges from 15-20 mg/kg/day, escalating to 35 mg/kg/day.
  • Ethnic neutropenia necessitates careful use of myelosuppressive drugs in certain populations.

Purpose of the Study:

  • To evaluate the efficacy and safety of a lower initial dose of HU with cautious dose escalation in pediatric SCD patients.
  • To determine if a reduced starting dose impacts treatment outcomes compared to standard protocols.

Main Methods:

  • Retrospective and prospective analysis of 161 SCD patients treated with HU at Sultan Qaboos University Hospital (1998-2011).
  • Patients received an initial HU dose of 10-12 mg/kg/day, adjusted based on response and side effects.
  • Patients were categorized into low-dose (10-15.9 mg/kg/day) and high-dose (16-26 mg/kg/day) groups.

Main Results:

  • Significant reductions in annual vaso-occlusive crisis admissions were observed in both low- and high-dose HU groups (P < 0.001).
  • No statistically significant difference in efficacy was found between the low- and high-dose groups (P > 0.05).
  • Both groups showed comparable improvements in laboratory markers (Hb, MCV, ANC) and clinical outcomes like acute chest syndrome; all patients tolerated treatment well with reversible toxicities.

Conclusions:

  • A lower initial dose regimen of HU is a safe and feasible option for managing sickle cell disease in children.
  • This approach maintains treatment efficacy without compromising safety, offering a viable alternative for managing SCD.
  • Cautious dose escalation ensures optimal therapeutic benefits while mitigating risks associated with myelosuppressive agents.
Abstract

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