Abstract
Background
Immunoglobulin (Ig) G4-associated autoimmune hepatitis (AIH) is a recently identified and possibly new disease entity. However, the epidemiology and clinical features of IgG4-associated AIH remain uncertain. The aim of this study was to determine the prevalence and the clinical, serological, and histological characteristics of IgG4-associated AIH.
Methods
We examined the clinical features, serum IgG4 concentration, liver biopsy histology, and IgG4-bearing plasma cell infiltration of 60 patients with type 1 AIH and 22 patients with autoimmune pancreatitis.
Results
High serum IgG4 concentration (≥135 mg/dL) and IgG4-bearing plasma cell infiltration in the liver (≥10/high-power fields [HPFs]) were found in 2 of the 60 (3.3%) patients with type 1 AIH. These patients had high serum levels of IgE, giant cell change, and rosette formation in the liver. Although corticosteroid therapy reduced the serum IgG4 concentration and normalized liver enzymes and histology, one patient developed IgG4-related sclerosing cholangitis after 5 years of follow-up.
Conclusions
Because IgG4-associated AIH was found in over 3% of Japanese patients with type 1 AIH in our cohort, further studies are needed on this possible new disease entity and its impact on the diagnostic guidelines of AIH.
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Acknowledgments
The authors would like to thank Mr. Trevor Ralph for his editorial assistance, and Professor Ian R. Mackay for critically reading this manuscript. This study was funded in part by a research grant from the Japanese Ministry of Health, Labour, and Welfare and a Shinshu University Grant-in-Aid for Young Scientists in Exploratory Research.
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Umemura, T., Zen, Y., Hamano, H. et al. Clinical significance of immunoglobulin G4-associated autoimmune hepatitis. J Gastroenterol 46 (Suppl 1), 48–55 (2011). https://doi.org/10.1007/s00535-010-0323-4
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DOI: https://doi.org/10.1007/s00535-010-0323-4