title: Hepatitis C virus-related arthritis: characteristics and response to therapy with interferon alpha.
abstract: OBJECTIVE
  To characterize hepatitis C virus (HCV)-related arthropathy and to evaluate the response to treatment with interferon-alpha (INF-alpha).
  
  
  METHODS
  We studied 28 HCV-infected patients with arthritis. All patients underwent complete clinical, laboratory and radiological evaluation, including assessment and follow-up by a rheumatologist. Twenty-five patients were treated with INF-alpha for a median period of 12 months.
  
  
  RESULTS
  All patients were HCV-RNA positive (genotype 1b in 65%). The mean duration of arthropathy-related symptoms prior to the diagnosis of HCV infection was 12 months. 19 patients (68%) had symmetric polyarthritis and 19 (68%) had morning stiffness > or = 60 min. None of the patients had erosive disease or subcutaneous nodules. 12 (43%) had detectable cryoglobulin (mean cryocrit: 3.6 +/- 3.5%), 17 (61%) had rheumatoid factor (RF) (median titer: 1:80), and only 15 (54%) had elevated ESR. 14 patients (50%) had > or = 4 ACR (American College of Rheumatology) criteria for the diagnosis of rheumatoid arthritis (RA), 9 of whom were mistakenly diagnosed and previously treated as RA patients. Only 3 patients had a satisfactory response to previous treatment with anti-inflammatory or disease modifying drugs. Complete or partial response of arthritis-related symptoms in INF-alpha treated patients was observed in 44% and 32%, respectively. Cryoglobulin became undetectable in 9 of 12 patients. However, a complete biochemical and virological end-of-treatment response was achieved in only 8 (36%) and 5 patients (20%), respectively.
  
  
  CONCLUSIONS
  HCV arthropathy should be considered in the differential diagnosis of any patient with arthritis, even in the absence of liver disease. Treatment with interferon-alpha may lead to substantial clinical improvement of HCV-related arthritis even without a complete biochemical or virological response.
authors.affiliation: Department of Internal Medicine A, B'nai Zion Medical Center, Bruce Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa, Israel.
authors.forename: E
authors.initials: E
authors.lastname: Zuckerman
authors.forename: D
authors.initials: D
authors.lastname: Keren
authors.forename: M
authors.initials: M
authors.lastname: Rozenbaum
authors.forename: E
authors.initials: E
authors.lastname: Toubi
authors.forename: G
authors.initials: G
authors.lastname: Slobodin
authors.forename: A
authors.initials: A
authors.lastname: Tamir
authors.forename: J E
authors.initials: JE
authors.lastname: Naschitz
authors.forename: D
authors.initials: D
authors.lastname: Yeshurun
authors.forename: I
authors.initials: I
authors.lastname: Rosner
mesh_terms: D000328:Adult; D000368:Aged; D000893:Anti-Inflammatory Agents / Q000627:therapeutic use; D018501:Antirheumatic Agents / Q000627:therapeutic use; D000998:Antiviral Agents / Q000627:therapeutic use*; D001170:Arthritis, Infectious / Q000097:blood / Q000175:diagnosis / Q000188:drug therapy* / Q000821:virology*; D001172:Arthritis, Rheumatoid / Q000175:diagnosis; D003450:Cryoglobulins / Q000032:analysis; D003937:Diagnosis, Differential; D005260:Female; D016174:Hepacivirus / Q000235:genetics; D019698:Hepatitis C, Chronic / Q000188:drug therapy*; D006801:Humans; D016898:Interferon-alpha / Q000627:therapeutic use*; D008107:Liver Diseases / Q000821:virology; D008297:Male; D008875:Middle Aged; D012333:RNA, Messenger / Q000378:metabolism; D012367:RNA, Viral / Q000235:genetics; D019233:Retreatment; D017211:Treatment Failure; D016896:Treatment Outcome
chemical_list: D000893:Anti-Inflammatory Agents; D018501:Antirheumatic Agents; D000998:Antiviral Agents; D003450:Cryoglobulins; D016898:Interferon-alpha; D012333:RNA, Messenger; D012367:RNA, Viral