Abstract
We retrospectively analyzed the impact of HLA-DPB1 mismatches in a large cohort of 1342 French patients who underwent 10/10 HLA-matched unrelated HSCT. A significant impact of HLA-DPB1 allelic mismatches (2 vs 0) was observed in severe acute GVHD (aGVHDIII–IV) (risk ratio (RR)=1.73, confidence interval (CI) 95% 1.09–2.73, P=0.019) without impact on OS, TRM, relapse and chronic GVHD (cGVHD). According to the T-cell epitope 3 (TCE3)/TCE4 HLA-DPB1 disparity algorithm, 37.6% and 58.4% pairs had nonpermissive HLA-DPB1, respectively. TCE3 and TCE4 disparities had no statistical impact on OS, TRM, relapse, aGVHD and cGVHD. When TCE3/TCE4 disparities were analyzed in the graft-vs-host or host-vs-graft (HVG) direction, only a significant impact of TCE4 nonpermissive disparities in the HVG direction was observed on relapse (RR=1.34, CI 95% 1.00–1.80, P=0.048). In conclusion, this French retrospective study shows an adverse prognosis of HLA-DPB1 mismatches (2 vs 0) on severe aGVHD and of nonpermissive TCE4 HVG disparities on relapse after HLA-matched 10/10 unrelated HSCT.
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Acknowledgements
We thank Dr Caroline Le Gall and Dr Pierre-Antoine Gourraud (Methodomics, Toulouse, France) for their support concerning statistical analysis, Dr Céline Clément (Agence de la Biomédecine, La Plaine Saint-Denis, France) for her help concerning extractions of HLA typing from French registry and Dr Florent Malard (CHU Hotel Dieu, Nantes, France) for his comments. This work was supported by grants from IRGHET (International Research Group on HEmatopoeitic cell Transplantation).
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Gagne, K., Loiseau, P., Dubois, V. et al. Is there any impact of HLA-DPB1 disparity in 10/10 HLA-matched unrelated hematopoietic SCT? Results of a French multicentric retrospective study. Bone Marrow Transplant 50, 232–236 (2015). https://doi.org/10.1038/bmt.2014.253
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DOI: https://doi.org/10.1038/bmt.2014.253
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