Abstract
We have conducted a retrospective study on 251 patients from three centers in France and Switzerland between 2004 and 2010 with the goal to evaluate the impact of HLA-DRB3/B4/B5 allele mismatching after HLA-10/10-matched unrelated allogeneic hematopoietic stem cell transplantation (HSCT). Fourteen (5.5%) patients receiving HSCT from an HLA-10/10-matched unrelated donor had a mismatched DRB4 donor, 23 (9.5%) patients had a mismatched DRB3 donor and 214 (85%) had a fully matched unrelated donor (HLA-10/10) without DRB3- or DRB4-mismatched donor. We compared the outcomes of 37 patients with a DRB3 or DRB4 mismatch with the rest of the population. The median survival for a patient without DRB3/4 mismatch was 18 months (95% confidence interval (CI), 13–29), for DRB3-mismatched patients 32 months (95% CI, 13-NR) and for DRB4-mismatched patients 7 months (95% CI, 3-NR). The multivariate analysis showed a significant impact of DRB4 mismatching on survival (Hazards ratio (HR)=2.1 (95% CI, 1.01–4.67), P=0.045), acute GvHD (HR=2.66 (95% CI, 0.99–7.09) P=0.05) and on transplant-related mortality (HR=2.8; (95% CI, 1.7−4.4) P=0.024). In the view of an impact of DRB4 locus mismatch on clinical outcome, it would be important to confirm this observation in a prospective study as it may be worth considering DRB4 in the unrelated donor selection.
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Acknowledgements
We acknowledge the contribution of Elodie Morais, Sylvie Rey and all technicians of the different laboratories, the medical and nursing staff of the three centers.
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Detrait, M., Morisset, S., Chalandon, Y. et al. Suggestive evidence of a role of HLA-DRB4 mismatches in the outcome of allogeneic hematopoietic stem cell transplantation with HLA-10/10-matched unrelated donors: a French–Swiss retrospective study. Bone Marrow Transplant 50, 1316–1320 (2015). https://doi.org/10.1038/bmt.2015.157
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DOI: https://doi.org/10.1038/bmt.2015.157
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