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Prepublished online as a Blood First Edition Paper on April 3, 2003; DOI 10.1182/blood-2002-11-3567.
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Blood, 1 August 2003, Vol. 102, No. 3, pp. 820-826
CLINICAL OBSERVATIONS, INTERVENTIONS, AND THERAPEUTIC TRIALS
Conditioning with fludarabine and targeted busulfan for transplantation of allogeneic hematopoietic stem cells
Martin Bornhäuser,
Barry Storer,
John T. Slattery,
Frederick R. Appelbaum,
H. Joachim Deeg,
John Hansen,
Paul J. Martin,
George B. McDonald,
W. Garrett Nichols,
Jerald Radich,
Ann Woolfrey,
Andreas Jenke,
Eberhard Schleyer,
Christian Thiede,
Gerhard Ehninger, and
Claudio Anasetti
From the Medizinische Klinik und Poliklinik I, University Hospital, Dresden, Germany; and the Fred Hutchinson Cancer Research Center, University of Washington, Seattle, WA
A regimen of busulfan and cyclophosphamide is standard therapy before transplantation of allogeneic hematopoietic stem cells in patients with chronic myelogenous leukemia (CML) or myelodysplastic syndrome (MDS). The clinical trial reported here was undertaken to test the hypothesis that fludarabine can replace cyclophosphamide in this regimen and facilitate donor engraftment with reduced toxicity. The conditioning regimen consisted of 30 mg/m2 intravenous fludarabine daily from day -9 to day -6, and oral busulfan given at 1 mg/kg 4 times a day every 6 hours from day -5 to day -2, with doses adjusted to target plasma levels of 900 ± 100 ng/mL at steady state. Cyclosporine and methotrexate were used for prophylaxis for graft-versus-host disease. Enrolled were 42 patients with high-risk CML (n = 4) or MDS (n = 38). The median patient age was 52 years (range, 12-65 years). Mobilized blood stem cells were obtained from HLA-compatible siblings (n = 16) or unrelated donors (n = 26). Engraftment was achieved in all patients, and the day-100 regimen-related mortality was 7%. With a median follow-up of 18 months (range, 13-27 months), the probabilities of overall survival, disease-free survival, and nonrelapse mortality were 42.4%, 34.9%, and 24%, respectively. These data indicate that the combination of fludarabine and targeted busulfan is sufficiently immunosuppressive to facilitate engraftment of blood stem cells from HLA-matched siblings and unrelated donors. Based on these encouraging results, further studies of fludarabine and targeted busulfan are warranted in standard-risk patients.
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