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Related Experiment Videos

Evaluation of the permissible mismatch concept

T Wujciak1, G Opelz

  • 1Institute of Immunology, University of Heidelberg, Germany.

Transplant International : Official Journal of the European Society for Organ Transplantation
|January 1, 1996
PubMed
Summary

The study found that the concept of "permissible mismatches" in HLA-A+B+DR mismatched transplants may not be reliable. Current classifications did not show significant outcome differences between permissible and immunogenic categories, questioning their clinical utility.

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Paul I Terasaki (10 September, 1929-25 January, 2016).

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Area of Science:

  • Immunogenetics
  • Transplantation immunology

Background:

  • The classification of Human Leukocyte Antigen (HLA) mismatches is crucial for transplant outcomes.
  • Maruya et al. proposed a method to categorize single HLA-A+B+DR mismatches into permissible and immunogenic groups, suggesting similar outcomes for permissible mismatches as zero mismatches.

Purpose of the Study:

  • To evaluate the validity of the proposed permissible mismatch classification using Collaborative Transplant Study (CTS) data.
  • To determine if the distinction between permissible and immunogenic mismatches holds significant prognostic value in kidney transplantation.

Main Methods:

  • Analysis of a large dataset from the Collaborative Transplant Study (CTS).
  • Comparison of transplant outcomes between zero, permissible, and immunogenic HLA-A+B+DR mismatched groups.

Related Experiment Videos

  • Statistical analysis to assess the significance of outcome differences between categories.

    • Main Results:

    • No significant differences were observed in transplant outcomes between the immunogenic and permissible mismatched groups in the CTS data.
    • While some pairwise comparisons showed significance for cadaveric transplants, the overall results did not support the concept.
    • The reliability of the current classification method is questioned due to small subgroup sizes.

    Conclusions:

    • The findings do not support the concept of permissible mismatches as defined by Maruya et al.
    • A more restrictive definition or alternative classification system for HLA mismatches may be necessary.
    • The current method lacks sufficient reliability for clinical application in predicting transplant outcomes.