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Altered effect of killer immunoglobulin-like receptor–ligand mismatch by graft versus host disease prophylaxis in cord blood transplantation

Abstract

The role of killer immunoglobulin-like receptor–ligand mismatch (KIR–ligand mismatch) between donors and recipients undergoing cord blood transplantation (CBT) is controversial. If each immunosuppressant differently affects natural killer (NK) cell function, the effect of KIR–ligand mismatch may be altered depending on the type of graft versus host disease (GVHD) prophylaxis. To verify this hypothesis, the difference in the effect of KIR–ligand mismatch was retrospectively assessed between patients who received CBT for acute leukemia, myelodysplastic syndrome, or chronic myeloid leukemia, as well as GVHD prophylaxis comprising tacrolimus plus methotrexate (MTX) or mycophenolate mofetil (MMF). In the MMF group (n = 1363), KIR–ligand mismatch augmented the incidence of non-relapse mortality (NRM; hazard ratio [HR], 1.40; P = 0.008), which worsened overall survival (OS; HR, 1.30, P = 0.0077). In the analysis of each KIR–ligand mismatch type, HLA-C2 mismatch had a favorable effect on relapse incidence (HR, 0.56; P = 0.0043) and OS (HR, 0.72; P = 0.037) only in the MTX group. In the MMF group, HLA-A3/A11 mismatch worsened NRM (HR, 1.93; P < 0.001) and OS (HR, 1.48; P = 0.014). These results imply that the effects of KIR–ligand mismatch differ with the type of GVHD prophylaxis and that assessing the KIR–ligand mismatch status is important for CBT.

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Fig. 1: Effect of KIR–ligand mismatch on CBT outcomes in patients who received tacrolimus plus MTX or tacrolimus plus MMF as GVHD prophylaxis.
Fig. 2: Multivariate analysis of the effect of a KIR–ligand mismatch on the incidence of relapse, aGVHD III–IV, cGVHD, NRM, and OS in patients undergoing CBT who received tacrolimus plus MTX or tacrolimus plus MMF for GVHD prophylaxis.
Fig. 3: Multivariate analysis of the effect of HLA-C2, -Bw4, and -A3/A11 mismatch on relapse and non-relapse mortality in patients undergoing CBT who received tacrolimus plus MTX or tacrolimus plus MMF as GVHD prophylaxis.
Fig. 4: Effect of HLA-C2, -Bw4, and -A3/A11 mismatch on overall survival following CBT in patients who received tacrolimus plus MTX or tacrolimus plus MMF as GVHD prophylaxis.
Fig. 5: Multivariate analysis of the effect of HLA-C2, -Bw4, and -A3/A11 mismatch on overall survival following CBT in patients who received tacrolimus plus MTX or tacrolimus plus MMF as GVHD prophylaxis.
Fig. 6: Impact of HLA-C2 and -A3/A11 mismatch on overall survival in patients with acute myeloid leukemia receiving CBT and tacrolimus plus MTX or tacrolimus plus MMF as GVHD prophylaxis.

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Acknowledgements

The authors would like to thank all the physicians and data managers who provided valuable data available from the Japanese Society for Transplantation and Cellular Therapy. The authors would also like to thank the staff at the Japanese Data Center for Hematopoietic Cell Transplantation for their contributions.

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HY, MH, YT, ST, and SM designed the study. NU, MT, MO, YO, DO, YK, AW, MS, HK, YM, and KO collected the data. TK, JK, TF, and YA managed the data. HY, MH, YT, ST, and SM analyzed and interpreted the data. HY wrote the first draft of the manuscript. ST and SM were responsible for the GvHD Working Group and HLA Working Group of JSHCT. All the authors reviewed and revised the manuscript.

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Correspondence to Hisayuki Yokoyama.

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Yokoyama, H., Hirayama, M., Takahashi, Y. et al. Altered effect of killer immunoglobulin-like receptor–ligand mismatch by graft versus host disease prophylaxis in cord blood transplantation. Bone Marrow Transplant 56, 3059–3067 (2021). https://doi.org/10.1038/s41409-021-01469-6

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