Evidence map›Paper›PMID 41257988›Full record

ArticleCommunications medicine2025

Soft kidney allocation improves HLA matching and maintains allocation order.

Sapir Israeli, Eytan Mor, Maya Mor Cohen, Ronit Pasvolsky Gutman, Ron Loewenthal, Benaya Rosen Zvi, Moshe Israeli, Ruth Rahamimov, Eviatar Nesher, Yoram Louzoun

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Article in Communications medicine, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

Authors and funding

10 authors.

Sapir IsraeliDepartment of Mathematics, Bar-Ilan University, Ramat Gan, Israel.ORCID http://orcid.org/0000-0003-1724-4979
Eytan MorDepartment of Nephrology, Sheba Medical Center, Ramat Gan, Israel.
Maya Mor CohenDepartment of Nephrology, Sheba Medical Center, Ramat Gan, Israel.
Ronit Pasvolsky GutmanTissue Typing Laboratory, Sheba Medical Center, Ramat Gan, Israel.
Ron LoewenthalTissue Typing Laboratory, Sheba Medical Center, Ramat Gan, Israel.
Benaya Rosen ZviDepartment of Nephrology and Hypertension, Rabin Medical Center, Petah Tikva, Israel.
Moshe IsraeliTissue Typing Laboratory, Rabin Medical Center, Petah Tikva, Israel.
Ruth RahamimovOrgan Transplantation Department, Rabin Medical Center, Petah Tikva, Israel.
Eviatar NesherOrgan Transplantation Department, Rabin Medical Center, Petah Tikva, Israel.
Yoram LouzounDepartment of Mathematics, Bar-Ilan University, Ramat Gan, Israel. louzouy@math.biu.ac.il.ORCID http://orcid.org/0000-0003-1714-6148

Funding

Israel Science Foundation (ISF) 870/20
6 · The paper itself

Abstract

backgroundKidney allocation scores aim to balance transplant efficacy and equity but often deprioritize Human Leukocyte Antigen (HLA) matching, leading to reduced graft lifespan and a higher risk of donor-specific antibodies (DSA). This study introduces a "soft allocation" strategy to improve HLA match rates while minimally disrupting the allocation queue or equity.

methodsDonors include directed-living (D-LD), non-directed-living (ND-LD), and deceased (DD) types. In the "soft allocation" system, instead of automatically assigning the kidney to the first person in line, the kidney is offered to the best HLA match among the top patients on the waiting list. The predefined size of the top patient group (typically 5-20 patients) is referred to as K. This approach preserves blood type and age compatibility while protecting patients with rare HLA types.

resultsAnalysis of 95,250 US DD transplants shows an increase in HLA-A&B&DR match scores from 1.45 to 1.77. In 42 recent DD cases and 230 ND-LD transplants in Israel, match scores improved from 2.33 to 2.54 and from 1.34 to 2.03, respectively. Similar enhancements are observed in related donor-recipient pairs using crossover transplants, achieving a three-fold match improvement without worsening any recipient's match.

conclusionsFor predefined allocation rules, soft allocation enables significant HLA matching improvement with minimal impact on allocation order, benefiting both unrelated and related transplants. Future work will extend this approach to include sensitized donations.

Identifiers

PMID41257988
PMCPMC12717165

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