title: Association of the shared epitope with radiological severity of rheumatoid arthritis.
abstract: OBJECTIVE
  To investigate the association between radiological severity of rheumatoid arthritis (RA) and the presence of the shared epitope.
  
  
  METHODS
  Ninety unrelated adult Spanish patients with RA with a disease duration of at least 3 years, selected according to the American College of Rheumatology criteria, were radiologically assessed (shoulders, elbows, wrists, hands, hips, knees, and feet) and classified as having severe or nonsevere RA. DNA oligotyping was used to determine DR specificities and to detect DR4 and DR1 alleles.
  
  
  RESULTS
  Forty-one patients (45.5%) had severe RA. Sixty-six patients (73.3%) carried the shared epitope and 18 (20%) had double expression of the shared epitope. Thirty-seven (90%) of the 41 patients with severe RA expressed the shared epitope. Logistic regression analysis showed that both single and double expression of the shared epitope were strongly related to the radiological severity of RA (odds ratio = 6.3 and 9.4, respectively).
  
  
  CONCLUSIONS
  Our results show that radiological severity of RA is highly associated to the shared epitope.
authors.affiliation: Rheumatology Service and the Immunology Service, Hospital Universitario Virgen del Rocio, Seville, Spain.
authors.forename: I
authors.initials: I
authors.lastname: Moreno
authors.forename: A
authors.initials: A
authors.lastname: Valenzuela
authors.forename: A
authors.initials: A
authors.lastname: García
authors.forename: J
authors.initials: J
authors.lastname: Yélamos
authors.forename: B
authors.initials: B
authors.lastname: Sánchez
authors.forename: W
authors.initials: W
authors.lastname: Hernánz
mesh_terms: D000328:Adult; D000483:Alleles; D001172:Arthritis, Rheumatoid / Q000000981:diagnostic imaging* / Q000235:genetics* / Q000276:immunology / Q000473:pathology; D000939:Epitopes / Q000235:genetics*; D005260:Female; D008040:Genetic Linkage; D006684:HLA-DR Antigens / Q000235:genetics; D006801:Humans; D007592:Joint Diseases / Q000235:genetics / Q000473:pathology; D016014:Linear Models; D008297:Male; D011446:Prospective Studies; D011859:Radiography; D013997:Time Factors
chemical_list: D000939:Epitopes; D006684:HLA-DR Antigens