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JÖRIS, M. M; LANKESTER, A. C; VAN WALRAVEN, S. M; VAN ROOD, J. J; CLAAS, F. H. J.j; OUDSHOORN, M; VAN DEM BORNE, P. A; KUBALL, J; BIERINGS, M; CORNELISSEN, J. J; GROENENDIJK-SIJNKE, M. E; VAN DER HOLT, B; HAASNOOT, G. W; VAN DER ZANDEN, H. G. M
Bone marrow transplantation (Basingstoke), 04/2013, Volume: 48, Issue: 4Journal Article
The MHC region on chromosome 6 contains a large number of non-HLA genes next to the HLA genes. Matching for HLA in unrelated hematopoietic SCT (HSCT) does not necessarily mean that these non-HLA genes are also matched. We selected 348 Northwest European patients transplanted with an HLA-A-, -B-, -C-, -DRB1-, -DQB1-matched unrelated donor (MUD) between 1987 and 2008. Patients' haplotypes were identified via descend. We were unable to determine the haplotypes of the donor; therefore we used frequent haplotypes (FH) in high linkage disequilibrium (LD) as a proxy for haplotype matching. Presence of a FH in a patient positively affected the probability and speed of identifying a matched unrelated donor. Competing risk survival analysis showed that patients with one or two FH have a statistically significantly decreased probability of developing ≥ grade II acute GVDH (aGVHD) without increased risk of relapse compared to patients without FH (HR (95% CI): 0.53 (0.31-0.91)). This association was strongest for those FH with the highest LD between both HLA-A and -C or -B, and HLA-C or -B and -DRB1 (HR (95% CI): 0.49 (0.26-0.92)). These results extend evidence that non-HLA allele coding regions have a significant impact on development of ≥ grade II aGVHD. We conclude that there is more to successful HSCT than matching for HLA genes.
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