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Petersdorf E.W.,Fred Hutchinson Cancer Research Center | Malkki M.,Fred Hutchinson Cancer Research Center | Hsu K.,Sloan Kettering Cancer Center | Bardy P.,Red Cross | And 16 more authors.
International Journal of Immunogenetics

The International Histocompatibility Working Group is a collaborative international effort to understand the HLA and non-HLA genetics of the transplantation barrier. The Working Group is comprised of experts in the fields of histocompatibility and immunogenetics, hematopoietic cell transplantation and outcomes research. Data for 25 855 unrelated donor transplants were submitted in support of research studies for the 16th International Histocompatibility Workshop. Active investigation is in progress in seven key areas: the impact of HLA matching, role of race and ethnicity, identification of permissible HLA mismatches, haplotype-associated determinants, minor histocompatibility antigens, immune response genes and KIR genetics. New hypotheses for the 16th workshop were developed for immunogenetic studies in cord blood and haploidentical-related donor transplantation. © 2012 Blackwell Publishing Ltd. Source

Morishima Y.,Japan Marrow Donor Program | Morishima Y.,Aichi Cancer Center Research Institute | Kawase T.,Japan Marrow Donor Program | Kawase T.,Aichi Cancer Center Research Institute | And 12 more authors.
Biology of Blood and Marrow Transplantation

The significance of patient and donor ethnicity on risk of acute graft-versus-host disease (GVHD) and disease relapse after unrelated donor hematopoietic cell transplantation (HCT) is not known. A total of 4335 patient-donor pairs from the International Histocompatibility Working Group in HCT met the following 3 criteria: (1)HLA-A, -B, -C, -DRB1, and -DQB1 allele matched donor, (2) diagnosis of leukemia, and (3) non-T cell depleted GVHD prophylaxis. Posttransplantation risks of acute GVHD and leukemia relapse were defined in Asian/Pacific Islander, white, African American, Hispanic, and Native American patients that underwent transplantation from donors with the same self-described background. Asian patients had a significantly lower incidence of acute GVHD (Japanese patients: 40.0% grades II to IV and 15.3% grades III to IV; non-Japanese Asian patients: 42.1% grades II to IV and 15.7% grades III to IV) compared with white patients (56.5% grades II to IV and 22.6% grades III to IV) (P<.001). The hazard ratio of acute GVHD for white patients was significantly higher than for Japanese patients. Unexpectedly, the hazard ratio of leukemia relapse in white patients with early disease status was also significantly higher than that in Japanese patients. These results provide a platform for future investigation into the genetic factors for unrelated donor HCT and clinical implications of diverse ethnic background. © 2013 American Society for Blood and Marrow Transplantation. Source

Nishiwaki S.,Red Cross | Inamoto Y.,Nagoya University | Sakamaki H.,Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital | Kurokawa M.,University of Tokyo | And 15 more authors.

To identify factors to improve the outcomes of related and unrelated allogeneic stem cell transplantations (allo-SCT) for Philadelphia chromosome-negative acute lymphocytic leukemia (Ph- ALL) in the first complete remission (CR1), we retrospectively analyzed 1139 Ph- ALL patients using the registry data, particularly the details of 641 patients transplanted in CR1. Overall survival was significantly superior among patients transplanted in CR1, but no significant difference was observed between related and unrelated allo-SCTs (related vs unrelated: 65% vs 62% at 4 years, respectively; P = .19). Among patients transplanted in CR1, relapse rates were significantly higher in related allo-SCT compared with unrelated allo-SCT, and multivariate analysis demonstrated that less than 6 months from diagnosis to allo-SCT alone was associated with relapse. On the other hand, nonrelapse mortality (NRM) was significantly higher in unrelated allo-SCT compared with related allo-SCT, and multivariate analysis demonstrated that 10 months or longer from diagnosis to allo-SCT, human leukocyte antigen mismatch, and abnormal karyotype were associated with NRM. In conclusion, our study showed comparable survival rates but different relapse rates, NRM rates, and risk factors between related and unrelated allo-SCTs. After a close consideration of these factors, the outcome of allo-SCT for adult Ph- ALL in CR1 could be improved. © 2010 by The American Society of Hematology. Source

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