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Antimitochondrial antibodies are of considerable importance for the diagnosis of primary biliary cirrhosis. Several subtypes of antimitochondrial antibodies have been identified and the pattern has been associated with prognosis of the disease in the long term course. 22 patients with primary biliary cirrhosis (19 female, 3 male; age 29-66, mean 49 years) were examined for the occurrence of the subtypes of antimitochondrial antibodies anti M2, anti M4 and anti M9. Diagnosis of primary biliary cirrhosis was based on elevated cholestatic enzymes, antimitochondrial antibodies, histology and exclusion of other chronic liver disease in all patients and elevated serum IgM concentration in 18/22 patients. Most patients were included in a study protocol of the Swiss Association for the Study of the Liver and treated with 10 mg/kg/day oral ursodeoxycholic acid. According to the subtype pattern of antimitochondrial antibodies, patients were divided into 4 groups A to D (A: anti M2-, anti M4-, anti M9+; B: anti M2+, anti M4-, anti M9+; C: anti M2+, anti M4-, anti M9- and D: anti M2+, anti M4+, anti M9-). The groups were compared with respect to the prognostically relevant parameters age, bilirubin, albumin, prothrombin time and peripheral edema, as well as the occurrence of granulomas in liver biopsy, galactose elimination capacity and response to treatment with ursodeoxycholic acid during one year. Treatment response was expressed as decrease of the serum concentration of IgM, GPT, alkaline phosphatase, gamma glutamyl transpeptidase and bilirubin. No significant differences between the four groups were found with respect to the prognostically relevant parameters, histology and galactose elimination capacity at study entry.(ABSTRACT TRUNCATED AT 250 WORDS)