Abstract
Human leucocyte antigen (HLA)-typing was studied in 82 hepatitis B carriers and 15 cases of autoimmune hepatitis (AIH) to elucidate the genetic factors which may associated with the etio-pathogenesis of chronic hepatitis in Japan. There were two types of HLA phenotypes: HLA A2 was associated with the progression of the disease induced by HBV infection, and HLA A26 and DR5 were related to the retardation of the disease. A family study confirmed the strong association of these HLA phenotypes with the disease induced by HBV infection. In the analysis of AIH, HLA DR4 is a risk factor related to susceptibility of Japanese AIH which shows different clinical manifestations compared to HLA-DR3-positive AIH, dominantly observed in Western countries. These results suggest that genetic background as expressed by HLA, is an important factor in restricting the development of type B hepatitis and AIH, and can explain racial differences of disease susceptibility.
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