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Autoimmune liver diseases including autoimmune hepatitis (AIH) and primary biliary cholangitis (PBC) are rare diseases. The aim of this review is to examine the epidemiology and clinical characteristics of AIH and PBC in South Korea. There were 4,085 patients registered as AIH in the Rare Intractable Disease Registry of Korea between 2009-2013, with a median age of 56 years and female-to male ratio of 6.4. The age-adjusted incidence and prevalence of AIH were 1.07/100,000/year and 4.82/100,000 persons, respectively. Among the patients, 1.1% underwent liver transplantation, and case fatality was 2.18%. Liver cirrhosis at diagnosis was accompanied in 23%; liver biopsy was performed in 75.2%, and prednisolone therapy or prednisolone and azathioprine combination therapy was done in 73% with a remission rate of 86%. There were 2,824 patients with PBC (≥20 years) registered in Korea between 2009-2013 with a median age of 57 years and female-to male ratio of 6.2. The age-adjusted incidence and prevalence of PBC were 0.86/100,000/year and 4.75/100,000 persons, respectively. Among the patients, 2.5% underwent liver transplantation, and case fatality was 2.2% with a 5-year transplantation-free survival of 95.4%. Ursodeoxycholic acid (UDCA) was prescribed in 90% of the patients with a UDCA inadequate response rate of 30%. In conclusion, AIH and PBC are rare but mostly treatable diseases if diagnosed in the early stages. However, scarce data, low awareness, delayed diagnosis and non-availability of 2nd line therapeutics are important issues to be solved. Therefore, governmental support for research and drug development and nationwide cooperative studies are warranted.
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Saera Jung, M.D., Han Chu Lee, M.D., Young Hwan Park, M.D., Sang Soo Lee, M.D.,
Hee Gon Song, M.D., Seung Il Pyo, M.D., Byung-Cheol Song, M.D.* ,
Young-Hwa Chung, M.D., Yung Sang Lee, M.D., and Dong Jin Suh, M.D.
Background/Aims There are no pathognomonic features of autoimmune hepatitis (AIH). Its diagnosis requires the exclusion of various other conditions. The aim of this study was to validate indirectly the International Autoimmune Hepatitis Group (IAHG) scoring system in diagnosing AIH. Methods: Twenty-six patients with Type 1 AIH and female patients with chronic hepatitis B (n=34), chronic hepatitis C (n=25), or toxic hepatitis (n=13) were evaluated according to 9 categories of pretreatment minimum required parameters proposed by IAHG. Aggregate scores of AIH to those of non-AIH groups, which were assessed before and after extracting the proportions of etiologic factors, were also compared and evaluated. Results: While aggregate scores of non-AIH groups, before extracting the proportions of etiologic factors, were 5.2±1.8, 5.6±1.1, and 7.4±1.2 in that order, those of AIH groups were 12.8±1.7. These were significantly higher than those of non-AIH groups (p<0.01). All patients in AIH groups and only 1 patient in a non-AIH group showed aggregate scores of more than 10. Aggregate scores after extracting the proportions of etiologic factors were more than 4 in all, except 2, patients. These should have been consistent with 10 if there were no etiologic factors in non-AIH groups. Conclusion: The IAHG scoring system might have a relatively excessive importance to the scores of categories excluding distinct etiologies from AIH. It might be difficult to differentiate AIH from chronic liver diseases of indistinct cause based on the IAHG scoring system.(Korean J Hepatol 2002;8:35-43)