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Blood, 15 October 2007, Vol. 110, No. 8, pp. 3064-3070. Prepublished online as a Blood First Edition Paper on June 14, 2007; DOI 10.1182/blood-2007-04-067215.
Submitted April 24, 2007
Division of Medical Hematology, Oncology & Transplantation, Blood and Marrow Transplant Program, University of Minnesota Medical School, Minneapolis, MN, United States * Corresponding author; email: bruns072{at}umn.edu.
We evaluated the efficacy of UCB in the setting of a nonmyeloablative regimen consisting of fludarabine (200 mg/m2), cyclophosphamide (50 mg/kg) and a single fraction of total body irradiation (200 cGy) with cyclosporine and mycophenolate mofetil for posttransplantation immunoprophylaxis. The target cell dose for the UCB graft was 3.0 x 107 nucleated cells/kg resulting in the selection of a second partially HLA matched UCB unit in 85%. One-hundred and ten patients (median age: 51 years) with hematological disease were enrolled. Neutrophil recovery was achieved in 92% at median of 12 days. Incidences of grades III-IV acute and chronic graft-versus-host disease (GVHD) were 22% and 23%, respectively. Transplant-related mortality was 26% at 3 years. Survival and event-free survival (EFS) at 3 years were 45% and 38%, respectively. Favorable risk factors were absence of high risk clinical features (Karnofsky 50-60, serious organ dysfunction, recent fungal infection, p<0.01) and absence of severe GVHD (p=0.04) for survival, and absence of high risk clinical features ( p<0.01) and use of two UCB units (p=0.07) for EFS. These findings support the use of UCB after a nonmyeloablative conditioning as a strategy for extending the availability of transplant therapy particularly for older patients.
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