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Hydroxyurea treatment for sickle cell disease: impact on haematopoietic stem cell transplantation's outcome

C Brachet1, N Azzi, A Demulder

  • 11Haemato-Oncology Unit, Hôpital Universitaire des Enfants-ULB, Brussels, Belgium.

Bone Marrow Transplantation
|February 10, 2004
PubMed

Insights

Hydroxyurea (HU) pre-treatment may improve outcomes for children with severe sickle cell disease (SCD) undergoing hematopoietic stem cell transplantation (HSCT). HU exposure was associated with a lower incidence of graft rejection or absent engraftment in this study.

Area of Science:

  • Hematology
  • Pediatric Medicine
  • Transplantation Immunology

Background:

  • Severe sickle cell disease (SCD) poses significant challenges, necessitating advanced treatments like hematopoietic stem cell transplantation (HSCT).
  • Pre-transplant conditioning regimens and drug exposures can influence HSCT outcomes in pediatric patients.
  • Hydroxyurea (HU) is used to manage SCD complications, but its impact on HSCT engraftment is not fully understood.

Purpose of the Study:

  • To compare the outcomes of HSCT in children with severe SCD based on pre-transplant conditioning regimens and exposure to hydroxyurea (HU).
  • To evaluate the association between pre-transplant HU exposure and the incidence of engraftment failure or rejection after HSCT.

Main Methods:

  • Retrospective analysis of 24 pediatric patients with severe SCD who underwent HSCT between 1988 and the study period.
  • Patients were categorized into three groups based on conditioning regimens: no HU/no antithymocyte globulin (ATG), no HU/ATG, and HU/ATG.
  • Outcomes assessed included engraftment, graft rejection, chimerism, and survival rates.

Main Results:

  • Overall, 20 of 24 patients achieved stable engraftment and remained symptom-free post-HSCT; 19 are alive and cured.
  • The group receiving HU prior to HSCT (HU+, ATG+) showed no instances of absent engraftment, mixed chimerism, or late rejection.
  • Conversely, groups without HU pre-treatment (HU-, ATG- and HU-, ATG+) experienced higher rates of engraftment failure and rejection.

Conclusions:

  • Pre-transplant treatment with hydroxyurea (HU) appears to be associated with a reduced incidence of graft rejection and absent engraftment in children with severe SCD undergoing HSCT.
  • These findings suggest that HU may play a beneficial role in optimizing HSCT outcomes for this patient population.
  • Further validation with larger patient cohorts is warranted to confirm these observations.

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