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Blood, 1 August 2006, Vol. 108, No. 3, pp. 836-846.
Prepublished online as a Blood First Edition Paper on April 4, 2006; DOI 10.1182/blood-2005-11-4503.
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Submitted November 15, 2005
Accepted March 3, 2006
Retrospective comparison of reduced intensity conditioning and conventional high dose conditioning for allogeneic hematopoietic stem cell transplantation using HLA identical sibling donors in myelodysplastic syndromes
Rodrigo Martino*, Simona Iacobelli, Ronald Brand, T. Jansen, Anja van Biezen, J. Finke, Andrea Bacigalupo, D. Beelen, J. Reiffers, A. Devergie, E. Alessandrino, G.J. Mufti, R. Barge, Jorge Sierra, T. Ruutu, M. Boogaerts, M. Falda, J.P. Jouet, Dieter Niederwieser, and Theo De Witte
Division of Clinical Hematology, Hospital de la Sant Creu i Sant Pau, Autonomous University of Barcelona, Barcelona, Spain
Department of Medical Statistics, University of Leiden, Leiden, The Netherlands
Chronic Leukemia Working Party Registry Leiden, Leiden, The Netherlands
Department of Medicine, Hematology, and Oncology, University of Freiburg, Freiburg, Germany
Department of Hematolo, Ospedale San Martino, Genova, Italy
Department of Bone Marrow Transplantation, University Hospital, Essen,, Essen, Germany
CHU Bordeaux, Hopital Haut-Leveque, Pessac, France
Department of Hematology, Hopital St. Louis, Paris, France
Policlinico San Matteo IRCCS, Pavia, Italy
Department of Haematology, Kings College London School of Medicine, London, United Kingdom
Department of Hematology, LUMC, Leiden, The Netherlands
Department of Medicine, Helsinki University Central Hospital, Helsinki, Finland
Department of Hematology, University Hospital of Leuven, Leuven, Belgium
Centro Trapianti Midollo, Azienda Ospedaliera S. Giovanni, Torino, Italy
Service de Maladies du Sang, Hopital Claude Huriez, Lille, France
Department Internal Medicine, University Hospital Leipzig, Leipzig, Germany
Department of Hematology, Radboud University Medical Center Nijmegen, Nijmegen, The Netherlands
* Corresponding author; email: rmartino{at}santpau.es.
In this multicenter retrospective study, the outcomes of 836 patients with myelodysplastic syndrome (MDS) who underwent transplantation with an HLA-identical sibling donor were analyzed according to two types of conditioning: reduced-intensity conditioning (RIC) in 215 patients, and standard myeloablative (or high dose) conditioning (SMC) in 621 patients. In multivariate analysis, the 3-year relapse rate was significantly increased after RIC (HR, 1.64; 95% CI, 1.2-2.2; P= 0.001), but the 3-year NRM was decreased in the RIC group (HR,0.61; 95% CI, 0.41-0.91; P= 0.015). The 3-year probabilities of progression-free and overall survivals were similar in both groups (39% after SMC vs. 33% in RIC; multivariate P=0.9; and 45% vs. 41%, respectively; P=0.8). In conclusion, the lower 3-year NRM after RIC is encouraging, since these patients were older (age >50 years in 73% RIC vs. 28% in SMC, p<0.0001) and had more adverse pre-transplant variables. However, based on the higher risk of relapse, patients with no contraindications for SMC should not receive a RIC outside of prospective randomized trials, which are needed to establish the position of RIC-based transplantation in the treatment of patients with MDS.

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