HLA-mismatched unrelated donors as an alternative graft source for allogeneic stem cell transplantation after antithymocyte globulin-containing conditioning regimen.
Between August 1996 and December 2004, 369 patients with a median age of 41 years (range: 1-68 years) received stem cell transplantation (SCT) from unrelated donors after an antithymocyte-globulin (ATG)-containing conditioning regimen. In 268 patients, complete molecular typing (4-digit) of HLA-A, -B, -C, -DRB1, and -DQB1 was available: 110 patients were completely matched for 10 alleles, 91 patients had 1 allele-mismatch (9/10), and 67 patients were mismatched for 2-4 alleles (6-8/10). The incidence of grade II-IV acute graft-versus-host disease (aGVHD) was 33% in the 10/10, 41% in the 9/10, and 40% in the 6-8/10 group, respectively (P = .1). The cumulative incidence of treatment-related mortality (TRM) and relapse among the groups were similar (27%, 31%, and 32%, P = .2; and 28%, 27%, and 26%, P = .9. After a median follow-up of 35 months (range: 3-120 months), the estimated 5-year disease-free survival (DFS) was 42% and did not differ among the 10/10, the 9/10, and the 6-8/10-mismatched groups (45% versus 42% versus 39%) (P = .5). In multivariate analysis, only age (hazard ratio [HR] 1.013) (P = .004) and bad-risk disease (HR 1.975) (P < .001) were independent risk factors for DFS. In conclusion, pretransplant ATG allows allogeneic SCT from unrelated donors with HLA disparities.
Kröger
Nicolaus
N
Department of Stem Cell Transplantation, University Hospital Hamburg-Eppendorf, Hamburg, Germany. nkroeger@uke.uni-hamburg.de
Zabelina
Tatjana
T
Binder
Thomas
T
Ayuk
Francis
F
Bacher
Ulrike
U
Amtsfeld
Gitta
G
Lellek
Heinrich
H
Schrum
Johanna
J
Erttmann
Rolf
R
Eiermann
Thomas
T
Zander
Axel
A
D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000961:Antilymphocyte Serum / Q000008:administration & dosage*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006086:Graft vs Host Disease / Q000401:mortality / Q000517:prevention & control*; D006680:HLA Antigens; D019337:Hematologic Neoplasms / Q000401:mortality / Q000628:therapy*; D006650:Histocompatibility Testing; D006801:Humans; D007166:Immunosuppressive Agents / Q000008:administration & dosage*; D015994:Incidence; D007223:Infant; D019520:Living Donors; D008297:Male; D008875:Middle Aged; D012008:Recurrence; D012189:Retrospective Studies; D012307:Risk Factors; D033581:Stem Cell Transplantation; D015996:Survival Rate; D019172:Transplantation Conditioning
D000961:Antilymphocyte Serum; D006680:HLA Antigens; D007166:Immunosuppressive Agents