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HLA and chronic active hepatitis

M C Mazzilli, S Trabace, F D Raimondo

    Digestion
    |January 1, 1977
    PubMed
    Summary
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    This study found a significant association between HLA-A3 and chronic active hepatitis (CAH) in patients. The HLA-A3/Bw35 combination also showed increased frequency and risk in individuals with CAH.

    Area of Science:

    • Immunogenetics
    • Hepatology
    • Human Leukocyte Antigen (HLA) system

    Background:

    • Chronic active hepatitis (CAH) is an inflammatory liver condition.
    • The Human Leukocyte Antigen (HLA) system plays a crucial role in immune responses.
    • Genetic predispositions, particularly HLA associations, are investigated in various diseases.

    Purpose of the Study:

    • To investigate the association between specific HLA alleles and chronic active hepatitis (CAH).
    • To determine the frequency of HLA-A and HLA-B loci alleles in CAH patients.
    • To evaluate the relative risk associated with specific HLA allele combinations in CAH.

    Main Methods:

    • HLA typing for 24 alleles of the A and B loci was performed on 42 patients diagnosed with CAH.
    • Diagnosis adhered to European Association for the Study of the Liver criteria.

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  • Case-control comparison with 266 healthy individuals.

    • Main Results:

    • A significantly increased frequency of HLA-A3 was observed in CAH patients (47.6%) compared to controls (19.1%), with a relative risk of 3.83.
    • The phenotypic association HLA-A3/Bw35 was also significantly increased in CAH patients (28.5%) versus controls (6.0%), yielding a relative risk of 6.25.
    • Family studies confirmed the presence of the HLA-A3/Bw35 haplotype in affected families.

    Conclusions:

    • The HLA-A3 allele is strongly associated with chronic active hepatitis.
    • The combined HLA-A3/Bw35 haplotype represents a significant genetic risk factor for developing CAH.
    • These findings contribute to understanding the immunogenetic basis of CAH.