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Willicombe M, Roberts DJ. Transfusion-induced HLA sensitization in wait-list patients and kidney transplant recipients. Kidney Int 2024:S0085-2538(24)00573-8. [PMID: 39181398 DOI: 10.1016/j.kint.2024.07.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 05/18/2024] [Accepted: 07/01/2024] [Indexed: 08/27/2024]
Abstract
Human leukocyte antigen (HLA) sensitization remains an impediment to successful solid organ transplantation, whether it be chances of receiving a transplant offer or subsequent transplant longevity. Current treatments targeting HLA antibodies lack long-term effectiveness; therefore, preventing HLA sensitization should remain a priority in all potential wait-list candidates and transplant recipients. Recent advances in the management of anemia in patients with chronic kidney disease may reduce the need for red cell transfusions. However, data from several anemia intervention studies of novel therapeutic agents have shown that a need for transfusion will remain. It has also been increasingly recognized that blood transfusions following kidney transplantation, especially in the peri-operative period, are common. Routine data on transfusion incidence, indications, and outcomes are not captured by most kidney and transplant registries across the globe. This restricts the evidence to inform both clinicians and patients on the clinical effects of transfusion, which have been considered both an allogeneic stimulus and to be immunomodulatory.This review aims to provide an update on what is currently known about transfusion-induced HLA sensitization in wait-list candidates and transplant recipients, summarizes where evidence is lacking, and demonstrates the distinct need for patient blood management guidelines in the field of kidney transplantation.
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Affiliation(s)
- Michelle Willicombe
- Centre for Inflammatory Disease, Department of Immunology and Inflammation, Imperial College London, London, UK; Imperial College Renal and Transplant Centre, Imperial College Healthcare NHS Trust, Hammersmith Hospital, London, UK.
| | - David J Roberts
- Biomedical Research Centre Haematology Theme, Radcliffe Department of Medicine, University of Oxford, Oxford, UK; NHS Blood and Transplant, John Radcliffe Hospital, Oxford, UK
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Durand G, Desoutter J, Lorriaux C, Poumaredes G, Joris M, Charbonnier A, Lebon D, Paubelle E, Garcon L, Guillaume N. Platelet transfusions in haploidentical haematopoietic stem cell allograft candidates: Protecting HLA-A and HLA-B antigens through eplet analysis. HLA 2024; 103:e15438. [PMID: 38516935 DOI: 10.1111/tan.15438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 01/29/2024] [Accepted: 02/28/2024] [Indexed: 03/23/2024]
Abstract
In patients awaiting an allogeneic haematopoietic stem cell transplantation, platelet transfusion is a risk factor for anti-HLA class I immunization because the resulting donor-specific antibodies complicate the allograft process. The objective of the present study was to determine the feasibility of a novel eplet-based strategy for identifying HLA class I mismatches between potential donors and the recipient when pre-allograft platelet transfusions were required. We included 114 recipient/haploidentical relative pairs. For each pair, we entered HLA-class I typing data into the HLA Eplet Mismatch calculator, defined the list of mismatched eplets (for the recipient versus donor direction) and thus identified the shared HLAs to be avoided. Using this list of HLAs, we defined the theoretical availability of platelet components (PCs) by calculating the virtual panel-reactive antibody (vPRA). We also determined the number of PCs actually available in France by querying the regional transfusion centre's database. The mean ± standard deviation number of highly/moderately exposed eplets to be avoided in platelet transfusions was 5.8 ± 3.3, which led to the prohibition of 38.5 ± 2 HLAs-A and -B. Taking into account the mismatched antigens and the eplet load, the mean ± standard deviation theoretical availability of PCs (according to the vPRA) was respectively 34.49% ± 1.95% for HLA-A and 80% ± 2.3% for HLA-B. A vPRA value below 94.9% for highly or moderately exposed eplets would predict that 10 PCs were actually available nationally. Although epitope protection of HLA molecules is feasible, it significantly restricts the choice of PCs.
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Affiliation(s)
- Gatien Durand
- Department of Haematology and Histocompatibility, Amiens University Hospital, Amiens, France
- EA HEMATIM 4666, Jules Verne University of Picardie, Amiens, France
| | - Judith Desoutter
- Department of Haematology and Histocompatibility, Amiens University Hospital, Amiens, France
- EA HEMATIM 4666, Jules Verne University of Picardie, Amiens, France
| | - Corinne Lorriaux
- Department of Blood Transfusions, Amiens University Hospital, Amiens, France
| | - Géraldine Poumaredes
- Department of Biology, Etablissement Français du Sang (EFS) Hauts de France, Amiens, France
| | - Magalie Joris
- Department of Clinical Haematology and Cellular Therapy, Amiens University Hospital, Amiens, France
| | - Amandine Charbonnier
- Department of Clinical Haematology and Cellular Therapy, Amiens University Hospital, Amiens, France
| | - Delphine Lebon
- EA HEMATIM 4666, Jules Verne University of Picardie, Amiens, France
- Department of Clinical Haematology and Cellular Therapy, Amiens University Hospital, Amiens, France
| | - Etienne Paubelle
- EA HEMATIM 4666, Jules Verne University of Picardie, Amiens, France
- Department of Clinical Haematology and Cellular Therapy, Amiens University Hospital, Amiens, France
| | - Loïc Garcon
- Department of Haematology and Histocompatibility, Amiens University Hospital, Amiens, France
- EA HEMATIM 4666, Jules Verne University of Picardie, Amiens, France
| | - Nicolas Guillaume
- Department of Haematology and Histocompatibility, Amiens University Hospital, Amiens, France
- EA HEMATIM 4666, Jules Verne University of Picardie, Amiens, France
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Julen K, Volken T, Holbro A, Infanti L, Halter JP, Schaub S, Wehmeier C, Diesch T, Rovó A, Passweg JR, Buser A, Drexler B. Transfusions in Aplastic Anemia Patients Cause HLA Alloimmunization: Comparisons of Current and Past Cohorts Demonstrate Progress. Transplant Cell Ther 2021; 27:939.e1-939.e8. [PMID: 34314891 DOI: 10.1016/j.jtct.2021.07.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 07/03/2021] [Accepted: 07/19/2021] [Indexed: 10/20/2022]
Abstract
Transfusions are the mainstay of supportive therapy in patients with aplastic anemia (AA) and may lead to anti- HLA alloimmunization, thereby also increasing the risk for donor-specific antibodies in the setting of HLA-mismatched transplantation. Historically, AA patients were thought to be at particularly high risk for HLA alloimmunization. In past decades, blood product manufacturing (leukoreduction) and HLA antibody testing have improved significantly by single antigen bead (SAB) technology. It is currently unknown how those developments have impacted HLA alloimmunization and treatment outcome in patients with AA. We retrospectively investigated 54 AA patients treated by immunosuppressive therapy or allogeneic hematopoietic cell transplantation after the introduction of the SAB assay at our center. We compared the HLA antibody results to a historical AA cohort (n = 26), treated before introduction of leukoreduced blood products from 1975 to 1995. HLA alloimmunization was detected in 43 of 54 (80%) recently treated patients. Past pregnancy, female gender, disease severity, age, and a history of other transfusions were significantly associated with a larger number or higher intensity (mean fluorescence intensity) of HLA antibodies. Treatment outcome including bleeding episodes, response to treatment, engraftment, graft-versus-host disease, and overall survival was not associated with HLA alloimmunization. In the historical cohort a significantly higher number of HLA antibodies (P < .01) with a higher mean fluorescent intensity (P < .01) was observed. HLA alloimmunization remains frequent in AA tested by current techniques, but it has significantly decreased since prior decades and does not affect treatment outcome. © 2021 American Society for Blood and Marrow Transplantation. Published by Elsevier Inc. All rights reserved.
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Affiliation(s)
- Katja Julen
- Blood Transfusion Center, Swiss Red Cross, Basel, Switzerland; Division of Hematology, University Hospital Basel, Switzerland
| | - Thomas Volken
- School of Health Professions, Zurich University of Applied Sciences, Winterthur, Switzerland
| | - Andreas Holbro
- Blood Transfusion Center, Swiss Red Cross, Basel, Switzerland; Division of Hematology, University Hospital Basel, Switzerland
| | - Laura Infanti
- Blood Transfusion Center, Swiss Red Cross, Basel, Switzerland; Division of Hematology, University Hospital Basel, Switzerland
| | - Jörg P Halter
- Division of Hematology, University Hospital Basel, Switzerland
| | - Stefan Schaub
- Clinic for Transplantation Immunology and Nephrology, University Hospital Basel
| | - Caroline Wehmeier
- Clinic for Transplantation Immunology and Nephrology, University Hospital Basel
| | - Tamara Diesch
- Division of Hematology /Oncology, University Children's Hospital Basel, Switzerland
| | - Alicia Rovó
- Division of Hematology, University Hospital Bern, Switzerland
| | - Jakob R Passweg
- Division of Hematology, University Hospital Basel, Switzerland
| | - Andreas Buser
- Blood Transfusion Center, Swiss Red Cross, Basel, Switzerland; Division of Hematology, University Hospital Basel, Switzerland
| | - Beatrice Drexler
- Blood Transfusion Center, Swiss Red Cross, Basel, Switzerland; Division of Hematology, University Hospital Basel, Switzerland.
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An epitope-based approach of HLA-matched platelets for transfusion: a noninferiority crossover randomized trial. Blood 2021; 137:310-322. [PMID: 33475737 DOI: 10.1182/blood.2020007199] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Accepted: 09/21/2020] [Indexed: 11/20/2022] Open
Abstract
Platelet transfusion refractoriness results in adverse outcomes and increased health care costs. Managing refractoriness resulting from HLA alloimmunization necessitates the use of HLA antigen-matched platelets but requires a large platelet donor pool and does not guarantee full matching. We report the first randomized, double-blind, noninferiority, crossover trial comparing HLA epitope-matched (HEM) platelets with HLA standard antigen-matched (HSM) platelet transfusions. Alloimmunized, platelet-refractory, thrombocytopenic patients with aplastic anemia, myelodysplastic syndrome, or acute myeloid leukemia were eligible. HEM platelets were selected using HLAMatchMaker epitope (specifically eplet) matching. Patients received up to 8 prophylactic HEM and HSM transfusions provided in random order. The primary outcome was 1-hour posttransfusion platelet count increment (PCI). Forty-nine patients were randomized at 14 UK hospitals. For intention to treat, numbers of evaluable transfusions were 107 and 112 for HEM and HSM methods, respectively. Unadjusted mean PCIs for HEM and HSM methods were 23.9 (standard deviation [SD], 15) and 23.5 (SD, 14.1), respectively (adjusted mean difference, -0.1; 95% confidence interval [CI], -2.9 to 2.8). Because the lower limit of the 95% CI was not greater than the predefined noninferiority limit, the HEM approach was declared noninferior to the HSM approach. There were no differences in secondary outcomes of platelet counts, transfusion requirements, and bleeding events. Adequate 1-hour PCI was more frequently observed, with a mean number of 3.2 epitope mismatches, compared with 5.5 epitope mismatches for inadequate 1-hour increments. For every additional epitope mismatch, the likelihood of an adequate PCI decreased by 15%. Epitope-matched platelets should be considered to support HLA alloimmunized patients. This trial was registered at www.isrctn.com as #ISRCTN23996532.
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Kreuter JD. Identifying human leukocyte antigen (HLA)-compatible platelets using the Matchmaker programme in alloimmunised platelet-refractory patients. Transfus Med 2020; 30:5-6. [PMID: 32187786 DOI: 10.1111/tme.12670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 02/04/2020] [Indexed: 11/29/2022]
Affiliation(s)
- Justin D Kreuter
- Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
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