title: Azathioprine versus mesalazine for prevention of postoperative clinical recurrence in patients with Crohn's disease with endoscopic recurrence: efficacy and safety results of a randomised, double-blind, double-dummy, multicentre trial.
abstract: OBJECTIVE
  The aim of the study was to compare azathioprine versus mesalazine tablets for the prevention of clinical recurrence in patients with postoperative Crohn's disease (CD) with moderate or severe endoscopic recurrence.
  
  
  METHODS
  This was a 1 year, double-blind, double-dummy, randomised study which took place in 21 gastroenterology centres in Austria, the Czech Republic, Germany and Israel. The study participants were 78 adults with CD who had undergone resection with ileocolonic anastomosis in the preceding 6-24 months without subsequent clinical recurrence and with a Crohn's disease activity index (CDAI) score <200, but with moderate or severe endoscopic recurrence. The study drugs were azathioprine 2.0-2.5 mg/kg/day or mesalazine 4 g/day over 1 year. The primary end point was therapeutic failure during 1 year, defined as a CDAI score > or = 200 and an increase of > or = 60 points from baseline, or study drug discontinuation due to lack of efficacy or intolerable adverse drug reaction.
  
  
  RESULTS
  Treatment failure occurred in 22.0% (9/41) of azathioprine-treated patients and 10.8% (4/37) of mesalazine-treated patients, a difference of 11.1% (95% CI -5.0% to 27.3%, p=0.19). Clinical recurrence was significantly less frequent with azathioprine versus mesalazine (0/41 (0%) vs 4/37 (10.8%), p=0.031), whereas study drug discontinuation due to adverse drug reactions only occurred in azathioprine-treated patients (9/41 (22.0%) vs 0%, p=0.002). The proportion of patients showing > or = 1 point reduction in Rutgeerts score between baseline and month 12 was 63.3% (19/30) and 34.4% (11/32) in the azathioprine and mesalazine groups, respectively (p=0.023).
  
  
  CONCLUSIONS
  In this population of patients with postoperative CD at high risk of clinical recurrence, superiority for azathioprine versus mesalazine could not be demonstrated for therapeutic failure.
authors.affiliation: Abteilung Gastroenterologie and Hepatologie, Universitätsklinik für Innere Medizin III, Abteilung Gastroenterologie and Hepatologie, Waehringer Guertel 18-20, A-1090 Vienna, Austria. walter.reinisch@meduniwien.ac.at
authors.forename: Walter
authors.initials: W
authors.lastname: Reinisch
authors.forename: Sieglinde
authors.initials: S
authors.lastname: Angelberger
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Petritsch
authors.forename: Olga
authors.initials: O
authors.lastname: Shonova
authors.forename: Milan
authors.initials: M
authors.lastname: Lukas
authors.forename: Simon
authors.initials: S
authors.lastname: Bar-Meir
authors.forename: Alexander
authors.initials: A
authors.lastname: Teml
authors.forename: Elke
authors.initials: E
authors.lastname: Schaeffeler
authors.forename: Matthias
authors.initials: M
authors.lastname: Schwab
authors.forename: Karin
authors.initials: K
authors.lastname: Dilger
authors.forename: Roland
authors.initials: R
authors.lastname: Greinwald
authors.forename: Ralph
authors.initials: R
authors.lastname: Mueller
authors.forename: Eduard F
authors.initials: EF
authors.lastname: Stange
authors.forename: Klaus R
authors.initials: KR
authors.lastname: Herrlinger
mesh_terms: D000328:Adult; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000627:therapeutic use*; D001379:Azathioprine / Q000009:adverse effects / Q000627:therapeutic use*; D003113:Colonoscopy; D003424:Crohn Disease / Q000517:prevention & control* / Q000601:surgery; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007166:Immunosuppressive Agents / Q000627:therapeutic use*; D008297:Male; D019804:Mesalamine / Q000009:adverse effects / Q000627:therapeutic use*; D008780:Methyltransferases / Q000097:blood; D008875:Middle Aged; D018579:Patient Selection; D055502:Secondary Prevention; D012720:Severity of Illness Index; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D007166:Immunosuppressive Agents; D019804:Mesalamine; D008780:Methyltransferases; C022745:thiopurine methyltransferase; D001379:Azathioprine