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Allogeneic Stem-Cell Transplantation From Related and Unrelated Donors in Older Patients With Myeloid Leukemia

From the Department of Hematology and Oncology, Albert Ludwigs University Medical Center, Freiburg, Germany.

Address reprint requests to J. Finke, MD, Albert Ludwigs University Medical Center, Department of Hematology/Oncology, Hugstetter Str 55, D-79106 Freiburg, Germany; email: finke{at}mm11.ukl.uni-freiburg.de.

Purpose: To improve outcome for older patients with poor-prognosis myeloid malignancies by using allogeneic hematopoietic stem-cell transplantation (alloHSCT) from unrelated and sibling donors after reduced-intensity conditioning (RIC).

Patients and Methods: Nineteen older patients (median age, 64 years; range, 60 to 70 years) with active myeloid malignancies were treated with an RIC regimen that was based on fludarabine, melphalan, and carmustine followed by alloHSCT from matched unrelated (n = 12) or sibling donors (n = 7). Before transplantation, patients had a median of 50% bone marrow blasts (range, 0% to 70%). Graft-versus-host-disease (GvHD) prophylaxis consisted of cyclosporine and mycophenolate mofetil or methotrexate. Eleven of 12 patients with an unrelated donor also received anti–T-lymphocyte globulin (ATG).

Results: Engraftment was successful for all 19 patients. Seventeen assessable patients achieved complete response (CR). Four patients experienced relapse; three achieved CR again after donor lymphocyte infusion (n = 1) or a second alloHSCT (n = 2). Six patients died as a result of relapse (n = 2), GvHD-associated complications (n = 2), or fungal infections (n = 2), resulting in a 1-year nonrelapse mortality rate of 22%. With a median follow-up of 825 days (range, 595 to 1,028 days), 13 of 19 patients are alive, resulting in a 1-year survival rate of 68% (95% confidence interval, 48% to 89%).

Conclusion: In older patients with untreated poor-prognosis leukemia, this RIC regimen combined with alloHSCT sufficiently reduces the leukemic burden, resulting in a high CR rate. When ATG is added, matched unrelated donor transplantation can be performed safely in older patients. For these patients, early transplantation after diagnosis offers a fair chance of cure.

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