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Prepublished online as a Blood First Edition Paper on April 30, 2002; DOI 10.1182/blood-2001-12-0304.

Submitted December 21, 2001
Accepted March 13, 2002
Transplantation of mobilized peripheral blood cells to HLA-identical siblings with standard-risk leukemia
Norbert Schmitz*, Meral Beksac, Dirk Hasenclever, Andrea Bacigalupo, Tapani Ruutu, Arnon Nagler, Eliane Gluckman, Nigel Russell, Jane F Apperley, Norbert C Gorin, Jeff Szer, Ken Bradstock, Agnes Buzyn, Peter Clark, Keith Borkett, and Alois Gratwohl
* Corresponding author; email: Norbert.Schmitz{at}ak-stgeorg.lbk-hh.de.
Allogeneic mobilized peripheral blood progenitor cells instead of bone marrow are increasingly used to restore hematopoiesis after myeloablative therapy.Data supporting this important change of clinical practice are scarce. We therefore, assigned patients with early leukemias to peripheral blood or bone marrow transplantation; the occurrence of acute and chronic graft-versus-host disease, survival, trans-plant-related mortality, and relapse rates were compared. Three hundred and fifty patients between 18 and 55 years of age with acute leukemias in re-mission or chronic myelogenous leukemia in first chronic phase were randomized to receive either fil-grastim-mobilized peripheral blood progenitor cells or bone marrow cells from HLA-identical sibling do-nors after standard high-dose chemoradiotherapy. Neutrophil and platelet recovery occurred significantly faster after transplantation of peripheral blood progenitor cells than after bone marrow transplantation. Acute graft-versus-host disease of grades II-IV was significantly more frequent in recipients of peripheral blood progenitor cells than in recipients of marrow cells (52% versus 39%, odds ratio 1.74, 95% confidence interval 1.12 to 2.69, P = 0.013). The cumulative incidence of chronic graft-versus-host disease was 67% with peripheral blood progenitor cell transplants and 54% with bone marrow cells (hazard ratio 1.67, 95% confidence interval 1.15 to 2.42, P = 0.0066). The estimated overall probability of survival at two years was 65% with either source of stem cells (hazard ratio 1.15, 95% confidence interval 0.79 to 1.67, P = 0.46). Disease-free survival, transplant-related mortality at day 100, and relapse rates did not significantly differ between treatment arms. Peripheral blood is an equivalent source of hematopoietic stem cells compared to bone marrow if administered to patients with standard-risk leukemias. Long-term observation of patients with different diseases and stages of disease is necessary to ultimately define the role of both sources of stem cells.

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