title: Medical risk factors for small-bowel adenocarcinoma with focus on Crohn disease: a European population-based case-control study.
abstract: BACKGROUND
  Crohn disease and biliary diseases have been associated with small-bowel adenocarcinoma (SBA). We examined how medical conditions affect the risk of SBA.
  
  
  METHODS
  A population-based European multicentre case-control study during the period 1995-97 including 95 histologically verified cases of SBA along with 3335 population controls; 70 cases (74%) and 2070 (62%) controls were interviewed about previous medical conditions.
  
  
  RESULTS
  Crohn disease was identified in two SBA cases (both located in ileum) and two controls; odds ratio (OR) 53.6 (6.0-477) (95% CI in parentheses). Only one case and no controls had had long-standing Crohn disease. Coeliac disease was associated with SBA (2 cases, 0 controls), but one of the cases was diagnosed at the same time as the SBA. Overall, people with a history of gallstones had no increased risk of SBA. The OR was exclusively increased during the 3-year period preceding the SBA diagnosis. Previous gallstone surgery, which may be a sign of severe gallstone disease, was not associated with SBA. Liver cirrhosis, hepatitis or medical treatments with radioactive substances or corticosteroid tablets were not associated with this disease. Cases with SBA had an increased prevalence of anaemia; OR 15.3 (2.5-92.1). An association between low educational level and SBA was found; OR 1.75 (1.0-3.0).
  
  
  CONCLUSIONS
  This study supports Crohn disease and coeliac disease being strong but rare risk factors for SBA. Previous gallstones were unrelated to SBA, and detection bias may account for the findings in earlier studies.
authors: Dept. of Epidemiology and Social Medicine, University of Aarhus, Vennelyst Boulevard 6, DK-8000 Aarhus C, Denmark. L.Kaerlev@dadlnet.dk
authors: L
authors: L
authors: Kaerlev
authors: P S
authors: PS
authors: Teglbjaerg
authors: S
authors: S
authors: Sabroe
authors: H A
authors: HA
authors: Kolstad
authors: W
authors: W
authors: Ahrens
authors: M
authors: M
authors: Eriksson
authors: P
authors: P
authors: Guénel
authors: L
authors: L
authors: Hardell
authors: G
authors: G
authors: Launoy
authors: E
authors: E
authors: Merler
authors: F
authors: F
authors: Merletti
authors: A
authors: A
authors: Stang
mesh_terms: D000230:Adenocarcinoma / Q000453:epidemiology*; D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D002446:Celiac Disease / Q000453:epidemiology; D002769:Cholelithiasis / Q000453:epidemiology; D003424:Crohn Disease / Q000453:epidemiology*; D005060:Europe / Q000453:epidemiology; D005260:Female; D006801:Humans; D007414:Intestinal Neoplasms / Q000453:epidemiology*; D007421:Intestine, Small; D008297:Male; D008875:Middle Aged; D012307:Risk Factors