title: Crohn's disease.
abstract: BACKGROUND
  Crohn's disease is a long-term chronic condition of the gastrointestinal tract. It is characterised by transmural, granulomatous inflammation that occurs in a discontinuous pattern, with a tendency to form fistulae. The cause is unknown but may depend on interactions between genetic predisposition, environmental triggers, and mucosal immunity.
  
  
  METHODS
  We conducted a systematic review and aimed to answer the following clinical questions: What are the effects of medical treatments in adults to induce remission in Crohn's disease? What are the effects of lifestyle interventions in adults with Crohn's disease to maintain remission? What are the effects of surgical interventions in adults with small-bowel Crohn's disease to induce remission? What are the effects of surgical interventions in adults with colonic Crohn's disease to induce remission? What are the effects of medical interventions to maintain remission in adults with Crohn's disease; and to maintain remission following surgery? We searched: Medline, Embase, The Cochrane Library and other important databases up to March 2006 (Clinical Evidence reviews are updated periodically, please check our website for the most up-to-date version of this review). We included harms alerts from relevant organisations such as the US Food and Drug Administration (FDA) and the UK Medicines and Healthcare products Regulatory Agency (MHRA).
  
  
  RESULTS
  We found 60 systematic reviews, RCTs, or observational studies that met our inclusion criteria.
  
  
  CONCLUSIONS
  In this systematic review we present information relating to the effectiveness and safety of the following interventions: aminosalicylates, antibiotics, azathioprine/mercaptopurine, ciclosporin, corticosteroids (oral), enteral nutrition, fish oil, infliximab, methotrexate, probiotics, resection, segmental colectomy, smoking cessation, and strictureplasty.
authors.affiliation: Imperial College, London, UK.
authors.forename: Alexander C
authors.initials: AC
authors.lastname: von Roon
authors.forename: George E
authors.initials: GE
authors.lastname: Reese
authors.forename: Timothy R
authors.initials: TR
authors.lastname: Orchard
authors.forename: Paris P
authors.initials: PP
authors.lastname: Tekkis
mesh_terms: D000284:Administration, Oral; D000305:Adrenal Cortex Hormones / Q000627:therapeutic use; D001379:Azathioprine / Q000627:therapeutic use; D003082:Colectomy; D003424:Crohn Disease / Q000188:drug therapy; D004750:Enteral Nutrition; D006801:Humans; D008019:Life Style; D012074:Remission Induction
chemical_list: D000305:Adrenal Cortex Hormones; D001379:Azathioprine