title: Interferon-alpha for maintenance of remission in Churg-Strauss syndrome: a long-term observational study.
abstract: BACKGROUND
  Interferon-alpha has been successfully used for induction of remission in patients with Churg-Strauss syndrome, but data on its ability to prevent relapses and its safety during long-term use are lacking.
  
  
  OBJECTIVE
  To examine the safety and efficacy of interferon-alpha for mainten-ance of remission in Churg-Strauss syndrome.
  
  
  METHODS
  In a prospective open-label long-term observational study, 13 patients with CSS in stable remission received interferon-alpha (3 x 3 Mio. I.U/week s.c.) for maintenance of remission. Primary end point was the incidence of relapses. Secondary end points were the doses of concomitant prednisolone and the frequency adverse events.
  
  
  RESULTS
  After a median follow up of 64 month three patients were still on treatment with interferon-alpha all with a dose of 9 million units/week. In nine patients, interferon-alpha was discontinued for lack of efficacy (n=5), due to adverse events (n=2), or both (n=2) after median of 63 months (15-153) of therapy. A total of 3 major and 18 minor relapses occurred in 10 of the 13 patients with a median time to first relapse of 17 months (range 5-46). Sera of relapsing patients did not contain antibodies against interferon-alpha. In 6 relapsing patients treatment was switched to cyclophosphamide (n=4) or methotrexate (n=2). Four episodes of worsened asthmatic symptoms associated with a mild rise of blood eosinophils occurred in 3 patients and resolved following a transient increase of the oral prednisolone dosage. After 49 months one patient died probably due to a relapse. IFN-alpha was ceased prematurely, because of autoimmune-thyreoiditis in one, depression in another and cerebral leukoencephalopathy in two patients. Overall, 18 infectious episodes with need of antimicrobial treatment were observed.CONCLUSIONS. Recombinant interferon-alpha appears to be partially effective in the prevention of major relapses in patients with Churg-Strauss syndrome. Due to numerous side effects and infections during long-term administration its use should be restricted to patients with contraindications against conventional immunosuppressive therapies.
authors.affiliation: Medizinische Klinik II, Krankenhaus der Barmherzigen Brüder Regensburg, Germany. claudia.metzler@barmherzige-regensburg.de
authors.forename: Claudia
authors.initials: C
authors.lastname: Metzler
authors.forename: Elena
authors.initials: E
authors.lastname: Csernok
authors.forename: Wolfgang L
authors.initials: WL
authors.lastname: Gross
authors.forename: Bernhard
authors.initials: B
authors.lastname: Hellmich
mesh_terms: D000328:Adult; D000906:Antibodies / Q000097:blood; D015267:Churg-Strauss Syndrome / Q000188:drug therapy* / Q000453:epidemiology / Q000276:immunology; D015331:Cohort Studies; D018572:Disease-Free Survival; D005260:Female; D006801:Humans; D007155:Immunologic Factors / Q000008:administration & dosage* / Q000009:adverse effects* / Q000276:immunology; D000077190:Interferon alpha-2; D016898:Interferon-alpha / Q000008:administration & dosage* / Q000009:adverse effects* / Q000276:immunology; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011994:Recombinant Proteins; D012074:Remission Induction; D055502:Secondary Prevention; D016036:Seroepidemiologic Studies
chemical_list: D000906:Antibodies; D007155:Immunologic Factors; D000077190:Interferon alpha-2; D016898:Interferon-alpha; D011994:Recombinant Proteins