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Pediatric Transplants

Early evaluation of immune reconstitution following allogeneic CD3/CD19-depleted grafts from alternative donors in childhood acute leukemia

Abstract

Graft engineering procedures for hematopoietic SCT (HSCT) may improve the chance of success in matched unrelated donor (MUD) and haploidentical donor transplantations. Successful donor immune reconstitution is important to mediate GVL effects in reduced-intensity conditioning (RIC) HSCT. We prospectively investigated early immune reconstitution and clinical outcome in 30 CD3/CD19-depleted MUD (n=15) or HP (n=15) HSCTs for high-risk childhood leukemia using a fludarabine-based RIC without serotherapy. The graft consisted of a mean of 10.5 × 106/kg CD34+, 77 × 103/kg CD3+ and 39 × 106/kg CD56+ cells. After transplantation, 86% of the patients engrafted. In all, 13% of patients had >grade 3 acute GVHD. Natural killer (NK) cell, DC and T-cell recovery achieved normal values within the first 60 days after transplantation. DC recovery was dominated by the DC2 subset. NK-cell phenotype was altered and cytotoxicity was lower compared with their donors. EFS was 50±9% (73±11% for those in CR1 and 26±11% for those with advanced disease). Faster DC2 recovery was associated with better outcome, especially in the MUD setting. In summary, CD3/CD19-depleted HSCT with fludarabine-based RIC without serotherapy resulted in favorable patient survival, and rapid NK, DC and T-cell recovery.

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Acknowledgements

We would like to acknowledge Dr W Leung from St Jude Children's Research Hospital for the critical review of the manuscript. We would also like to thank Hannah Maxwell from Cardiff University for the English edition of the manuscript. This work was supported in part by National Health Service of Spain grant FIS PS09/02393, Fundación Mutua Madrileña and ‘La hucha de Tomás’ project (http://www.lahuchadetomas.com/).

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Correspondence to A Pérez-Martínez.

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Pérez-Martínez, A., González-Vicent, M., Valentín, J. et al. Early evaluation of immune reconstitution following allogeneic CD3/CD19-depleted grafts from alternative donors in childhood acute leukemia. Bone Marrow Transplant 47, 1419–1427 (2012). https://doi.org/10.1038/bmt.2012.43

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