title: Characterization of M2 antibodies in asymptomatic Chinese population.
abstract: OBJECTIVE
  To investigate the presence of M2 antibodies specific for primary biliary cirrhosis (PBC) in asymptomatic Chinese and identify patients with early PBC.
  
  
  METHODS
  Enzyme-linked immunosorbent assay (ELISA) tests for M2 antibodies to recombinant protein were performed in 5 011 subjects (age range, 26-85 years; mean age: 45.81+/-15.02 years) who took an annual physical examination. M2-positive subjects were further analyzed for immunoglobulin (Ig) classes and subclasses of M2 antibodies. Clinical, biochemical and immunological data were obtained for M2-positive subjects. In addition, ultrasonography (US) or endoscopic retrograde cholangio-pancreatography (ERCP) was performed to exclude any disorders other than PBC.
  
  
  RESULTS
  M2 antibodies were detected in 8 (0.16 %) of the 5 011 subjects studied. Of the 8 subjects, 7 were female and 1 was male (age range: 40-74 years). An unexplained increase of serum alkaline phosphatase (ALP) and gamma glutamyl transpeptidase (gamma-GT) values, often to striking levels, was detected in 4 M2-positive subjects, 3 of them accorded with the diagnostic criteria recommended by the American Association for the Study of Liver Diseases, even though they had no symptoms of PBC (such as fatigue, pruritus or jaundice). Liver biopsy was performed in two M2-positive subjects and the histology was compatible with PBC in both cases.
  
  
  CONCLUSIONS
  Our data, while not assessing the true prevalence of asymptomatic PBC in the general population, suggest that asymptomatic PBC is much more common in China than has been supposed.
authors.affiliation: Department of Laboratory Medicine, 85 Hospital of Chinese PLA, Huashan Road, Shanghai 200052, China. jhlulu@citiz.net
authors.forename: Xiao-Hua
authors.initials: XH
authors.lastname: Jiang
authors.forename: Ren-Qian
authors.initials: RQ
authors.lastname: Zhong
authors.forename: Xiao-Yun
authors.initials: XY
authors.lastname: Fan
authors.forename: Yin
authors.initials: Y
authors.lastname: Hu
authors.forename: Feng
authors.initials: F
authors.lastname: An
authors.forename: Jian-Wen
authors.initials: JW
authors.lastname: Sun
authors.forename: Xian-Tao
authors.initials: XT
authors.lastname: Kong
mesh_terms: D000328:Adult; D000368:Aged; D000469:Alkaline Phosphatase / Q000097:blood; D001323:Autoantibodies / Q000032:analysis*; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D008099:Liver / Q000473:pathology; D008105:Liver Cirrhosis, Biliary / Q000175:diagnosis* / Q000276:immunology* / Q000473:pathology / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D008930:Mitochondria, Liver / Q000276:immunology*; D005723:gamma-Glutamyltransferase / Q000097:blood
chemical_list: D001323:Autoantibodies; D005723:gamma-Glutamyltransferase; D000469:Alkaline Phosphatase