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Marrow versus blood-derived stem cell grafts for allogeneic transplantation from unrelated donors in patients with active myeloid leukemia or myelodysplasia.

Peripheral blood stem cells (PBSCs) are increasingly used as the graft source in allogeneic hematopoietic cell transplantation. We compared long-term outcome after unrelated donor transplantation of 85 consecutive patients with acute myelogenous leukemia or myelodysplastic syndrome regarding disease status (early disease [CR1, refractory anemia); n = 25 and advanced/active disease [>CR1, >refractory anemia]; n = 60) who were treated with conventional conditioning regimens followed by bone marrow (BM) or PBSC grafts. Graft-versus-host disease prophylaxis consisted mainly of cyclosporine A, short-course methotrexate, and anti-T-lymphocyte globulin. After a median follow-up of 118 months (68-174), the 10-year event-free survival rate after peripheral blood stem cell transplantation (PBSCT) was 54.8% (95% confidence interval [CI], 39.7%-69.8%), and after bone marrow transplantation (BMT), it was 27.9% (14.5%-41.3%; P < .004). In the advanced/active disease group, the 10-year event-free survival rate after PBSCT was 50% (30.8%-69.2%), and after BMT, it was 23.5% (9.3%-37.8%; P < .007). Non relapse mortality was less after PBSCT than BMT (14.3% vs 30.2%), respectively. In multivariate Cox regression analysis, PBSCT showed a better overall survival (OS; hazard ratio [HR], 0.43; 95% CI, 0.23-0.79; P = .007) compared to BMT; unfavorable/unknown prognostic impact cytogenetic abnormalities were an adverse factor for all patients (HR, 2.202; 95% CI, 1.19-4.06; P = .011). In patients with advanced disease, the use of PBSCs showed a significant favorable outcome via multivariate analysis (HR, 0.49; 95% CI, 0.24-0.99; P = .046). Outcome of acute myelogenous leukemia/myelodysplastic syndrome after unrelated hematopoietic cell transplantation is adversely affected by cytogenetic abnormalities and state of remission at hematopoietic cell transplantation. PBSC as a graft source has a significant favorable influence on survival.

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