Abstract
The number of infused cells is a very important factor in cord blood transplant (CBT) engraftment. Prior ex vivo expansion of aliquots of transplanted cord blood (CB) units is being investigated as a procedure to increase engraftment potential, but results are difficult to evaluate due to a lack of markers for assessing the contribution of expanded cells. We transplanted five patients, infusing the best available CB unit and cells from a second donor simultaneously. In two patients, these cells were obtained from another frozen CB unit by CD34+positive selection and culture expansion; the other three patients received uncultured highly purified haploidentical CD34+ cells. The first two patients had DNA from the culture expanded CB cells detected only for a few days around day +11 when the absolute neutrophil count (ANC) was >200/μl; thereafter and when the ANC was <500/μl, only donor DNA from the uncultured CB was detected. For the other three patients, DNA analysis showed early and transient granulocyte engraftment of haploidentical cells, progressively replaced by the CB-derived granulocytes. We concluded that: (1) simultaneous infusion of lymphocyte-depleted HLA highly mismatched haematopoietic progenitor cells has not produced unfavourable effects for CBT; (2) the double transplant model is suitable for evaluating the engraftment potential of ex vivocultured CB cells in the clinical setting; (3) the culture conditions used did not result in early recovery of ANC; and (4) co-transplantation of purified uncultured HLA haploidentical CD34+ cells may reduce the time of neutropenia following CBT.Bone Marrow Transplantation (2001) 28, 355–363.
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Acknowledgements
We wish to thank the ‘Fundación Ramón Areces’ and the ‘Fundación Josep Carreras’ for financial support of this work. Mrs P Dodi is acknowledged for her skilled editorial help.
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Fernández, M., Regidor, C., Cabrera, R. et al. Cord blood transplants: early recovery of neutrophils from co-transplanted sibling haploidentical progenitor cells and lack of engraftment of cultured cord blood cells, as ascertained by analysis of DNA polymorphisms. Bone Marrow Transplant 28, 355–363 (2001). https://doi.org/10.1038/sj.bmt.1703143
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DOI: https://doi.org/10.1038/sj.bmt.1703143
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