Abstract
Allogeneic hematopoietic cell transplantation (HCT) following nonmyeloablative conditioning has been extensively evaluated in patients with hematologic malignancies who are ineligible for conventional HCT because of age or medical comorbidities. Nonmyeloablative regimens have led to an initial state of mixed hematopoietic chimerism defined as coexistence of donor- and host-derived hematopoiesis. While nonmyeloablative regimens have been associated with reduced regimen-related toxicities in comparison with conventional myeloablative conditioning, graft rejection, graft-versus-host disease (GVHD), and disease progression have remained significant challenges. In this article, after briefly introducing current techniques for chimerism assessment, we describe factors affecting donor chimerism levels after nonmyeloablative conditioning, and then review data suggesting that chimerism assessment early after HCT might help identify patients at risk for graft rejection, GVHD and relapse/progression. Finally, we discuss how these observations have opened the way to further research protocols evaluating manipulation of postgrafting immunosuppression, and/or infusion of donor immune cells.
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Acknowledgements
We acknowledge Barry Storer for help with the figures. We thank Helen Crawford, Bonnie Larson, and Sue Carbonneau for help with this paper preparation. We are grateful to Heather Hildebrant and Deborah Bassuk for data processing, the research nurses Mary Hinds, Michelle Bouvier and John Sedgwick, and the medical nursing and clinical staffs for their dedicated care of the patients. This work was supported by grants CA78902, CA18029, CA15704, DK42716, and HL36444 of the National Institutes of Health, Bethesda, MD. FB is research associate of the National Fund for Scientific Research (FNRS) Belgium and supported in part by postdoctoral grants from the Fulbright Commission and from the Centre Anticancereux près l'ULg.
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Baron, F., Sandmaier, B. Chimerism and outcomes after allogeneic hematopoietic cell transplantation following nonmyeloablative conditioning. Leukemia 20, 1690–1700 (2006). https://doi.org/10.1038/sj.leu.2404335
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DOI: https://doi.org/10.1038/sj.leu.2404335
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