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Blood, 15 March 2002, Vol. 99, No. 6, pp. 1943-1951
CLINICAL OBSERVATIONS, INTERVENTIONS, AND THERAPEUTIC TRIALS
Unrelated donor marrow transplantation for
myelodysplastic syndromes: outcome analysis in 510 transplants
facilitated by the National Marrow Donor Program
Hugo Castro-Malaspina,
Richard E. Harris,
James Gajewski,
Norma Ramsay,
Robert Collins,
Bernie Dharan,
Roberta King, and
H. Joachim Deeg
From the National Marrow Donor Program, Minneapolis,
MN; Memorial Sloan-Kettering Cancer Center, New York, NY; Children's
Hospital Medical Center, Cincinnati, OH; MD Anderson Cancer Center,
Houston, TX; University of Minnesota, Minneapolis; Baylor-Sammons
Cancer Center and University of Texas Southwestern Medical Center,
Dallas; and Fred Hutchinson Cancer Center, Seattle, WA.
Between April 1988 and July 1998, 510 patients with myelodysplastic
syndromes (MDS) underwent unrelated donor bone marrow transplantation
(BMT) facilitated by the National Marrow Donor Program. Median age was
38 years (range, <1-62 years). Several conditioning regimens
and graft-versus-host disease (GVHD) prophylaxis methods were used, and
T-cell depletion was used in 121 patients. Donors were serologically
matched for HLA-A, -B, and -DRB1 antigens for 74% of patients. Of 437 patients evaluable for engraftment, 24 (5% cumulative incidence, with
95% confidence interval [CI] of 3%-7%) failed to engraft,
and an additional 33 (8% cumulative incidence; 95% CI, 6%-10%) had
late graft failure. Grades II to IV GVHD developed in 47% of patients
(95% CI, 43%-49%), and limited and extensive chronic GVHD developed
at 2 years in 27% (95% CI, 24%-30%). The incidence of relapse at 2 years was 14% (95% CI, 11%-17%). Greater relapse was independently
associated with advanced MDS subtype and no acute GVHD. The estimated
probability of disease-free survival (DFS) at 2 years was 29% (95%
CI, 25%-33%). Improved DFS was independently associated with less
advanced MDS subtype, higher cell dose, recipient cytomegalovirus (CMV)
seronegativity, shorter interval from diagnosis to transplantation, and
transplantation in recent years. Common causes of death were
treatment-related complications accounting for 82% of fatalities. The
2-year cumulative incidence of treatment-related mortality (TRM) was
54% (95% CI, 53%-61%). Sixty-nine percent of TRM occurred within
the first 100 days, and 93% occurred within the first year of
transplantation. Higher TRM was independently associated with older
recipient and donor age, HLA mismatch, and recipient CMV
seropositivity. This study demonstrates that unrelated donor BMT cures
a significant proportion of patients with MDS. TRM is the major problem
limiting the success of unrelated donor BMT in MDS. The observations
made in this study should facilitate the design of prospective trials aimed at improving the results of unrelated donor stem cell
transplantation for MDS.

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