Journal
BRITISH JOURNAL OF HAEMATOLOGY
Volume 148, Issue 2, Pages 323-331Publisher
WILEY-BLACKWELL PUBLISHING, INC
DOI: 10.1111/j.1365-2141.2009.07984.x
Keywords
multiple myeloma; unrelated donor; allogeneic stem cell transplantation; reduced intensity conditioning; graft-versus-myeloma effect
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P>From 2002 to 2007, 49 myeloma patients who relapsed following autologous SCT were included in a prospective multicenter trial to determine the efficacy of a reduced melphalan/fludarabine regimen followed by allogeneic SCT from unrelated donors. All patients showed leucocyte and platelet engraftment after a median of 15 and 19 d, respectively. Grade II-IV acute graft-versus-host disease (GvHD) occurred in 25% of patients and 35% had chronic GvHD. Overall response rate at day 100 was 95% including 46% complete remission (CR). Cumulative incidence of non-relapse mortality at 1 year was 25% [95% confidence interval (CI): 13-37%] and was significantly lower for human leucocyte antigen (HLA)-matched compared to -mismatched SCT (10% vs. 53%, P = 0 center dot 001). The cumulative incidence of relapse at 3 years was 55% (95% CI: 40-70%). After a median follow up of 43 months, the estimated 5-year progression-free and overall survival rates were 20% and 26% respectively and were significantly better for matched in CR at day 100 (41% vs. 7%, P = 0 center dot 04 and 56% vs. 16%, P = 0 center dot 02). We conclude that optimal donor selection is mandatory for a low non-relapse mortality and high relapse incidence, which remains a major concern, should be improved by including post-transplant strategies to upgrade remission status.
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