Reduced-intensity conditioning for myeloma: lower nonrelapse mortality but higher relapse rates compared with myeloablative conditioning.
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 transplantations for myeloma and reported to the EBMT. A minimum data set was available on 320 RIC and 196 MAC allografts performed between 1998 and 2002. The RIC patients were older (51 vs 45 years) 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 transplantation and an increased use of peripheral blood and T-cell depletion. For RIC and MAC, respectively, the nonrelapse mortality (NRM) at 2 years was 24% and 37% (P = .002); overall survival, 38.1% and 50.8% (not significant [ns]); and progression-free survival (PFS), 18.9% and 34.5% (P = .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.
Crawley
Charles
C
Department of Haematology, Addenbrooke's Hospital, Hills Road, Cambridge, UK. charles.crawley@addenbrookes.nhs.uk
Iacobelli
Simona
S
Björkstrand
Bo
B
Apperley
Jane F
JF
Niederwieser
Dietger
D
Gahrton
Gösta
G
D000328:Adult; D000368:Aged; D018572:Disease-Free Survival; D005260:Female; D006801:Humans; D008212:Lymphocyte Depletion; D008297:Male; D008875:Middle Aged; D009101:Multiple Myeloma / Q000401:mortality* / Q000628:therapy*; D036102:Peripheral Blood Stem Cell Transplantation; D012008:Recurrence; D012189:Retrospective Studies; D012307:Risk Factors; D015996:Survival Rate; D019172:Transplantation Conditioning; D014184:Transplantation, Homologous