Summary:
We analyzed predictive factors for the outcome of 113 acute myeloid leukemia patients receiving reduced-intensity conditioning prior to allogeneic hematopoietic stem cell transplantation (HSCT). Patients were ineligible for conventional-intensity HSCT. Conditioning consisted of fludarabine and 50% of the conventional dose of busulfan (n=93) or total body irradiation (n=20). The source of stem cells was blood in 102 patients, marrow in 10, and both in one. In total, 50 (44.2%) donors were HLA-matched siblings, 50 (44.2%) unrelated fully matched and 13 (11.5%) partially mismatched family (n=1) or unrelated (n=12) donors. In all, 107 (94.6%) patients showed neutrophil and platelet engraftment after a median time of 13.5 and 13 days. The probabilities of event-free survival (EFS) (median follow-up: 12 months) were 49% for patients with less than 5% blasts in the marrow, 24% for patients with 5–20% blasts (P=0.002) and 14% with >20% blasts (P⩽0.001). Death occurred because of relapse in 29 patients (25.6%), infection in 12 patients (10.6%), acute graft-versus-host disease in eight patients (7.0%) and organ toxicity in nine patients (7.9%). In multivariate analysis, higher number of blasts in the marrow, alternative donors and low Karnofsky performance score were independent adverse prognostic factors for EFS.
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Acknowledgements
We thank all of the physicians and nursing staff in the participating study centers that have been involved in the care of the patients. This work was supported in part by the Kompetenznetz ‘Akute und Chronische Leukämien’. Parts of the study were presented at the 43rd Annual Meeting of the American Society of Hematology in Orlando Florida, December 2001.
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Sayer, H., Kröger, M., Beyer, J. et al. Reduced intensity conditioning for allogeneic hematopoietic stem cell transplantation in patients with acute myeloid leukemia: disease status by marrow blasts is the strongest prognostic factor. Bone Marrow Transplant 31, 1089–1095 (2003). https://doi.org/10.1038/sj.bmt.1704062
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DOI: https://doi.org/10.1038/sj.bmt.1704062
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