Conditioning with cyclophosphamide/antithymocyte globulin for allogeneic bone marrow transplantation from HLA-matched
1Department of Pediatrics and Clinical Immunology, Mie University School of Medicine, Japan.
Insights
Cyclophosphamide (CY) plus antithymocyte globulin (ATG) conditioning effectively prevents graft rejection in children with severe aplastic anemia (SAA) undergoing bone marrow transplantation. This regimen demonstrated durable engraftment without significant graft-versus-host disease (GVHD).
Area of Science:
- Hematology
- Immunology
- Pediatric Oncology
Background:
- Graft rejection is a significant challenge in bone marrow transplantation for severe aplastic anemia (SAA).
- Optimizing conditioning regimens is crucial for successful transplantation outcomes in pediatric SAA patients.
Purpose of the Study:
- To evaluate the efficacy and safety of a conditioning regimen using cyclophosphamide (CY) and antithymocyte globulin (ATG) in children with SAA undergoing bone marrow transplantation.
- To assess the rates of engraftment and graft-versus-host disease (GVHD) in this patient cohort.
Main Methods:
- Ten children with SAA received conditioning with CY (50 mg/kg) and ATG (15 mg/kg) for 4 days.
- Bone marrow infusion was performed 36 hours after the last CY dose.
- Graft-versus-host disease (GVHD) prophylaxis included Cyclosporin A and methotrexate.
Main Results:
- All ten patients achieved durable engraftment.
- Follow-up ranged from 7 to 41+ months (mean, 25 months).
- No significant graft-versus-host disease (GVHD) was observed.
Conclusions:
- The conditioning regimen of cyclophosphamide (CY) and antithymocyte globulin (ATG) is well-tolerated in children with severe aplastic anemia (SAA).
- This regimen is effective in achieving durable engraftment and preventing significant GVHD in pediatric SAA bone marrow transplantation.
- CY/ATG conditioning represents a viable strategy for SAA treatment.
Abstract:
Graft rejection has been a problem after bone marrow transplantation for patients with severe aplastic anemia (SAA). Ten children with SAA were conditioned for bone marrow transplantation from HLA-identical siblings, using cyclophosphamide (CY, 50 mg/kg) plus antithymocyte globulin (ATG, 15 mg/kg) for 4 successive days. Marrow was infused 36 h after the last dose of CY. Cyclosporin A and methotrexate were administered as graft-versus-host disease (GVHD) prophylaxis. All patients achieved durable engraftment at follow-up of 7-41+ months (mean, 25) without significant GVHD. Since investigators have used different sources, doses, and time schedules of ATG, we compared our results with other published reports. We conclude that CY/ATG conditioning is well tolerated and effective in children with SAA.
Related Concept Videos
01:21Stem Cell Therapy for Tissue Regeneration
Types of Stem Cells used in Stem Cell Therapy
The two main cell types that...
01:22Bone Marrow Sampling and Transplants
The transplant begins with high doses of chemotherapy and radiation treatment, which aim to destroy the...