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Blood, 15 April 2007, Vol. 109, No. 8, pp. 3588-3594.
Prepublished online as a Blood First Edition Paper on December 7, 2006; DOI 10.1182/blood-2006-07-036848.
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Submitted July 28, 2006
Accepted November 27, 2006
Reduced intensity conditioning for myeloma: lower non-relapse mortality but higher relapse rates compared to myeloablative conditioning
Charles Crawley*, Simona Iacobelli, Bo Bjorkstrand, Jane F. Apperley, Dietger Niederwieser, and Gosta Gahrton
Addenbrooke's Hospital, Cambridge, United Kingdom
Department of Medical Statistics, Leiden University Medical Center, Leiden, Netherlands
Karolinska University Hospital, Stockholm, Sweden
Imperial College, Hammersmith Hospital, London, United Kingdom
University of Leipzig, Leipzig, Germany
* Corresponding author; email: charles.crawley{at}addenbrookes.nhs.uk.
Despite the widespread adoption of reduced intensity conditioning (RIC) for myeloma there are few data comparing outcomes with RIC with myeloablative conditioning (MAC). We report the outcomes of patients undergoing allogeneic transplants for myeloma and reported to the EBMT. A minimum data set was available on 320 RIC and 196 MAC allografts performed between 1998-2002. The RIC patients were older (51 vs 45yrs) with more progressive disease (28% vs 21%) and more had received a prior transplant (76% vs 11%), In addition there was a longer time to transplant and an increased use of peripheral blood and T cell depletion. The non relapse mortality (NRM) at 2 yrs was 24% and 37% (p=0.002) for RIC and MAC respectively with the overall survival being 38.1% and 50.8% (ns) and progression free survival (PFS) 18.9% vs 34.5% (p=0.001). On multivariate analysis RIC was associated with a reduction in NRM (HR 0.5) but this was offset by an increase in relapse risk (HR 2.0) and the conditioning intensity did not impact on overall survival or retain significance for PFS. These data suggest that there is a continuing need to investigate dose intensity in the conditioning for myeloma allografts.

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