Abstract
We investigated whether a T cell-reduced allogeneic stem cell transplant (SCT) with minimal conditioning and subsequent donor lymphocyte infusions (DLI) could reduce the incidence and severity of GVHD while retaining stable engraftment. Five patients with hematological malignancies (three MM, one CLL, one Chediak-Higashi syndrome) were conditioned with TBI (200 cGy). One patient additionally received fludarabine (120 mg/m2). CsA and mofetyl-mycophenolate (MMF) were administered to prevent GVHD. All patients were grafted with >3 × 106/kg highly purified CD34+ cells together with 2 × 106/kg CD3+ cells (three patients) or 1 × 105/kg CD3+ cells (two patients). Quick hematopoietic recovery and initial mixed donor chimerism was observed. Treatment-related toxicity was minimal in all but one patient who died of treatment-refractory GVHD on day 112. The four other patients only achieved partial donor T cell chimerism. BM and PBMC donor chimerism was lost between day 40 and 209 despite DLI. Three patients are alive with disease and one is in CR. We conclude that T cell-reduced SCT using 200 cGy as the conditioning regimen does not result in stable hematopoietic engraftment. Predominant donor T cell chimerism is not a prerequisite for initial allogeneic hematopoietic proliferation. However for sustained long-term engraftment it is of major importance. Bone Marrow Transplantation (2001) 28, 157–161.
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Acknowledgements
We would like to thank Beate Stradmann-Bellinghausen and Jutta Lummer for their excellent technical assistance. This work was supported by a grant from the Deutsche Krebshilfe (No. 70–2428-Schm 2). Martin Schuler is a fellow of the Dr Mildred Scheel Stiftung für Krebsforschung.
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Kreiter, S., Winkelmann, N., Schneider, P. et al. Failure of sustained engraftment after non-myeloablative conditioning with low-dose TBI and T cell-reduced allogeneic peripheral stem cell transplantation. Bone Marrow Transplant 28, 157–161 (2001). https://doi.org/10.1038/sj.bmt.1703107
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DOI: https://doi.org/10.1038/sj.bmt.1703107
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