title: Risk of tuberculosis in rheumatoid arthritis patients on tumour necrosis factor-alpha inhibitor treatment in Taiwan.
abstract: OBJECTIVE
  To quantify the incidence of tuberculosis (TB) in rheumatoid arthritis patients undergoing treatment with tumour necrosis factor-alpha inhibitors (TNFi).
  
  
  METHODS
  In a retrospective cohort study conducted using data from Taiwan's National Health Insurance claims databases, rheumatoid arthritis patients notified during the period 2006-2008 were recruited and classified based on types of TNFi treatment received. Active TB was the primary outcome. TB risk was estimated using Cox's proportional hazard model. The TB screening rate within 30 days of initiating treatment with TNFi was examined.
  
  
  RESULTS
  Respectively 5079 and 829 patients were included in the non-TNFi and TNFi groups. Active TB rates were respectively 1411.3 and 679.5 events per 100,000 person-years in patients treated with adalimumab and etanercept. Significant TB risk was noted in patients treated with TNFi (aHR 4.87, 95%CI 2.14-11.06). No significant difference in active TB was observed between the TNFi subgroups (etanercept as reference, aHR 1.89, 95%CI 0.40-6.04). Only 8.7% (n = 9) of TNFi users underwent screening for TB before the first dose of TNFi.
  
  
  CONCLUSIONS
  Patients on TNFi have a significantly greater risk of active TB than non-TNFi patients in the Taiwanese population. No difference in TB risk between the two available TNFi groups was noted. Screening for TB before initiating treatment with TNFi should be implemented.
authors.affiliation: Division of Drug Safety, Taiwan Drug Relief Foundation, Taipei, Taiwan.
authors.forename: W-M
authors.initials: WM
authors.lastname: Ke
authors.forename: L-S
authors.initials: LS
authors.lastname: Chen
authors.forename: I-M
authors.initials: IM
authors.lastname: Parng
authors.forename: W-W
authors.initials: WW
authors.lastname: Chen
authors.forename: A W F
authors.initials: AW
authors.lastname: On
mesh_terms: D000328:Adult; D000368:Aged; D018501:Antirheumatic Agents / Q000009:adverse effects*; D001172:Arthritis, Rheumatoid / Q000175:diagnosis / Q000188:drug therapy* / Q000276:immunology; D016009:Chi-Square Distribution; D005260:Female; D006801:Humans; D016867:Immunocompromised Host; D015994:Incidence; D008297:Male; D008875:Middle Aged; D009894:Opportunistic Infections / Q000139:chemically induced / Q000453:epidemiology* / Q000276:immunology; D016016:Proportional Hazards Models; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D013624:Taiwan / Q000453:epidemiology; D013997:Time Factors; D014376:Tuberculosis / Q000139:chemically induced / Q000453:epidemiology* / Q000276:immunology; D014409:Tumor Necrosis Factor-alpha / Q000037:antagonists & inhibitors* / Q000378:metabolism
chemical_list: D018501:Antirheumatic Agents; D014409:Tumor Necrosis Factor-alpha