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Published on: March 14, 2011
Salvage allogeneic hematopoietic SCT for primary graft failure in children
M Kato1, K Matsumoto, R Suzuki
1Department of Hematology/Oncology, Saitama Children's Medical Center, Saitama, Japan. katom-tky@umin.ac.jp
Insights
Salvage hematopoietic stem cell transplant (HSCT) can rescue pediatric primary graft failure (pGF). Matched or one-antigen mismatched related donors offer superior survival, while cord blood transplantation is a viable alternative.
Area of Science:
- Pediatric Hematology
- Transplantation Immunology
- Oncology
Background:
- Primary graft failure (pGF) following hematopoietic stem cell transplantation (HSCT) leads to significant morbidity and mortality in children.
- Salvage HSCT offers a potential rescue strategy for pediatric pGF, but optimal donor selection and preconditioning remain unclear.
Purpose of the Study:
- To evaluate the efficacy of different donor sources and preconditioning regimens in pediatric patients undergoing salvage allogeneic HSCT for pGF.
- To identify factors influencing engraftment and overall survival (OS) in this high-risk population.
Main Methods:
- Retrospective analysis of 102 pediatric patients who received salvage allogeneic HSCT for pGF.
- Comparison of outcomes based on donor type (matched/mismatched related donors, cord blood) and preconditioning agents (fludarabine, irradiation, alkylating agents).
Main Results:
- Salvage HSCT from matched or one-antigen mismatched related donors (rMM01) resulted in superior overall survival (OS) compared to more mismatched related donors (rMM23) or cord blood transplantation (CBT).
- Cord blood transplantation (CBT) demonstrated comparable OS to rMM23, despite a trend towards lower and delayed engraftment.
- Preconditioning regimens including fludarabine or irradiation were linked to higher engraftment rates, whereas alkylating agents were associated with better OS.
Conclusions:
- Matched or one-antigen mismatched related donors are the preferred choice for salvage HSCT in pediatric pGF.
- Cord blood transplantation represents an important alternative for patients lacking suitable related donors, offering similar survival outcomes to less-matched related donors.
Abstract:
Primary graft failure (pGF) is associated with considerable morbidity and mortality. Salvage hematopoietic SCT (HSCT) can rescue pGF patients; however, the optimal preconditioning regimen and stem cell source are yet to be determined, particularly in children. In this study, we retrospectively analyzed 102 pediatric patients who received salvage allogeneic HSCT for pGF. Salvage HSCT from matched or one-Ag-mismatched related donors (rMM01) provided superior OS compared with that from two- or three-Ags-mismatched related donors (rMM23) or cord blood transplantation (CBT). CBT showed a trend toward a slightly lower engraftment rate and late engraftment achievement compared with rMM23; however, the OS rate was similar between the two groups (47.6±7.7% for rMM23 and 45.7±8.6% for CBT, at 1 year after salvage HSCT). Multivariate analysis showed that preconditioning regimens with fludarabine or irradiation were associated with a higher engraftment rate and those with alkylating agents were associated with better OS. In conclusion, our results showed that rMM01 was the most suitable donor for salvage HSCT for pediatric pGF, and that CBT was an equally important option compared with rMM23 for patients without rMM01.
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