title: Absence of antineutrophil cytoplasmic antibodies in relatives of UK patients with primary sclerosing cholangitis and ulcerative colitis.
abstract: OBJECTIVE
  Perinuclear antineutrophil cytoplasmic antibodies (ANCA) have been reported in patients and relatives of patients with ulcerative colitis and primary sclerosing cholangitis, suggesting that ANCA may be a genetic marker of disease susceptibility. The reported frequency of ANCA in relatives has varied greatly, between 0 and 30%. We therefore studied the prevalence of ANCA in unaffected first-degree relatives of British patients with primary sclerosing cholangitis and ulcerative colitis.
  
  
  METHODS
  Thirty-six patients with ulcerative colitis, 33 with primary sclerosing cholangitis and 187 relatives were studied. Ninety-seven relatives were from the primary sclerosing cholangitis proband and 90 were from the ulcerative colitis proband. As an environmental control, 32 spouses were included: 14 from the primary sclerosing cholangitis group and 18 from the ulcerative colitis group. Eighteen healthy volunteers were additional controls.
  
  
  METHODS
  ANCA was detected using immunoalkaline phosphatase method.
  
  
  RESULTS
  Only 3 of 97 (3%) of the primary sclerosing cholangitis proband relatives had ANCA. One of these had ulcerative colitis, one had rheumatoid arthritis and the third systemic lupus erythematosus. Both rheumatoid arthritis and system lupus erythematosus are known to exhibit ANCA. All other sera were negative.
  
  
  CONCLUSIONS
  ANCA was found only in patients with primary cholangitis and ulcerative colitis and not in their healthy first-degree relatives. ANCA is therefore not a genetic marker for increased disease susceptibility to primary sclerosing cholangitis or ulcerative colitis in the British population.
authors.affiliation: Department of Gastroenterology, Oxford Radcliffe Hospital, UK.
authors.forename: D S
authors.initials: DS
authors.lastname: Bansi
authors.forename: S
authors.initials: S
authors.lastname: Lo
authors.forename: R W
authors.initials: RW
authors.lastname: Chapman
authors.forename: K A
authors.initials: KA
authors.lastname: Fleming
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019268:Antibodies, Antineutrophil Cytoplasmic; D001323:Autoantibodies / Q000032:analysis*; D015209:Cholangitis, Sclerosing / Q000276:immunology*; D003093:Colitis, Ulcerative / Q000276:immunology*; D004198:Disease Susceptibility; D005260:Female; D005819:Genetic Markers; D006801:Humans; D008297:Male; D008875:Middle Aged
chemical_list: D019268:Antibodies, Antineutrophil Cytoplasmic; D001323:Autoantibodies; D005819:Genetic Markers