HLA-Matched Sibling Transplantation for Severe Aplastic Anemia: Impact of HLA DR15 Antigen Status on Engraftment, Graft-versus-Host Disease, and Overall Survival. | Aplastic Anemia and MDS International Foundation

HLA-Matched Sibling Transplantation for Severe Aplastic Anemia: Impact of HLA DR15 Antigen Status on Engraftment, Graft-versus-Host Disease, and Overall Survival.

Journal Title: 
Biol Blood Marrow Transplant
Author(s): 
Battiwalla M, Wang T, Carreras J, Deeg HJ, Ayas M, Bajwa RP, George B, Gupta V, Pasquini R, Schrezenmeier H, Passweg JR, Schultz KR, Eapen M.
Primary Author: 
Battiwalla M
Original Publication Date: 
Tuesday, February 28, 2012

The HLA class II DRB1 antigen DR15 (common alleles *1501, *1502) is an important marker in the pathobiology of severe aplastic anemia (SAA). We studied 1204 recipients of HLA-matched sibling bone marrow transplantation for SAA to determine whether HLA DR15 status (as determined by allele-level typing) affected hematopoietic recovery, graft-versus-host disease (GVHD), or overall survival (OS). In multivariate analysis, secondary graft failure rate at 2 years was lower in patients who were HLA DR15+ (hazard ratio = 0.46, P = .01). However, neutrophil recovery at day -28, platelet recovery at day -100, acute GVHD, chronic GVHD, and overall mortality were independent of DR15 status. The 5-year probabilities of OS, after adjusting for age, race, performance score, transplant-conditioning regimen, and year of transplantation, were 78% and 81% for patients who were HLA DR15+ and HLA DR15-, respectively (P = .35). In conclusion, DR15 status is associated with secondary graft failure after HLA-matched sibling bone marrow transplantation for SAA but has no significant impact on survival.

Bone Marrow Diseases: