title: Evaluation of international classification criteria (2002) for primary Sjögren's syndrome in Chinese patients.
abstract: OBJECTIVE
  To evaluate the sensitivity and specificity of international classification criteria (2002) for primary Sjögren's syndrome (pSS) and the role of lower lip biopsy in diagnosis of pSS in Chinese patients.
  
  
  METHODS
  Patients who were diagnosed by the experts/rheumatologists as pSS during 1990-2002 from the Department of Rheumatology, Peking Union Medical College Hospital were retrospectively collected as experimental group. Patients who were diagnosed as non-pSS connective tissue diseases or non-connective tissue diseases served as control group. Those with a history of head-neck radiation, hepatitis C virus infection, AIDS, lymphoma, sarcoidosis, graft versus host disease (GVHD), and anti-acetylcholine drug use were exempted. Both groups were required to complete questionnaires about symptoms such as dry eyes and dry mouth, and complete the objective tests of keratoconjunctivitis and xerostomia including Schirmer test, corneal staining, unstimulated salivary flow, sialography, lower lip biopsy, and antinuclear antibodies (including anti-SSA/SSB antibodies) test.
  
  
  RESULTS
  A total of 330 pSS patients were included in experimental group and 185 non-pSS patients in control group. The mean age of both groups matched (47.8 +/- 10.9 years vs. 46.2 +/- 13.6 years, P > 0.05). The sensitivities of the criteria in pSS patients with lower lip biopsy and in pSS patients without lower lip biopsy were 89.2% and 87.2%, respectively; the overall sensitivity was 88.5%. The specificity was 97.3%. A total of 11.3% pSS patients with negative anti-SSA/SSB anti- bodies were diagnosed as pSS by lower lip biopsy.
  
  
  CONCLUSIONS
  The international classification criteria (2002) for pSS is feasible in Chinese patients. It has high sensitivity and specificity, and may serve as diagnosis criteria in routine clinical practice.
authors.affiliation: Department of Rheumatology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730.
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhao
authors.forename: Jian
authors.initials: J
authors.lastname: Kang
authors.forename: Wen-Jie
authors.initials: WJ
authors.lastname: Zheng
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
authors.forename: Xiao-Ping
authors.initials: XP
authors.lastname: Guo
authors.forename: Yan
authors.initials: Y
authors.lastname: Gao
authors.forename: Yi
authors.initials: Y
authors.lastname: Dong
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001706:Biopsy; D002648:Child; D002681:China / Q000453:epidemiology; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D008046:Lip / Q000473:pathology; D008297:Male; D008875:Middle Aged; D017410:Practice Guidelines as Topic / Q000592:standards*; D012680:Sensitivity and Specificity; D012859:Sjogren's Syndrome / Q000145:classification* / Q000175:diagnosis* / Q000453:epidemiology; D011795:Surveys and Questionnaires