Effect of graft-versus-host disease on outcomes after pediatric single cord blood transplantation

Area of Science:

• Hematology
• Transplantation immunology

Background:

• Graft-versus-host disease (GVHD) is a major complication after hematopoietic stem cell transplantation.
• The impact of GVHD on outcomes following unrelated cord blood transplantation (UCBT) in pediatric patients requires further clarification.

Purpose of the Study:

• To investigate the association between acute and chronic GVHD and transplant outcomes in pediatric patients undergoing their first UCBT.

Main Methods:

• Retrospective analysis of 740 pediatric patients (0-15 years) with acute leukemia or myelodysplastic syndrome who received their first UCBT.
• Evaluation of the incidence of grade I-II and grade III-IV acute GVHD and limited chronic GVHD.
• Statistical analysis of the impact of GVHD on non-relapse mortality (NRM), relapse risk, and overall survival.

Main Results:

• Grade III-IV acute GVHD was significantly associated with higher NRM (HR 4.07) and overall mortality (HR 1.68).
• Grade I-II acute GVHD did not impact NRM or relapse risk, nor did it confer a survival benefit.
• Limited chronic GVHD was associated with a reduced risk of overall mortality (HR 0.60).

Conclusions:

• Severe acute GVHD (grade III-IV) adversely affects survival and increases NRM in pediatric UCBT and should be prevented.
• Mild acute GVHD (grade I-II) does not offer survival advantages.
• Mild chronic GVHD may have a protective effect on survival after pediatric UCBT.