title: Risk of mortality and cancer incidence in Barrett's esophagus.
abstract: BACKGROUND
  There are very few prospective follow-up studies of Barrett esophagus (BE) cohorts assessing the risk of extraesophageal cancer incidence or mortality. Such studies are necessary in order to understand the overall risks of cancer and death experienced by patients with BE.
  
  
  METHODS
  A cohort of 502 patients with BE were identified at Leeds General Infirmary, England. Mortality and cancer incidence information were provided by the Office for National Statistics. Standardized mortality ratios (SMR) and standardized incidence ratios (SIR) were calculated using indirect standardization.
  
  
  RESULTS
  All-cause mortality was found to be elevated in patients with BE [SMR, 1.21; 95% confidence interval (95% CI), 1.06, 1.37] and remained so after esophageal cancers were excluded (SMR, 1.16; 95% CI, 1.01-1.32). Increased mortality risks were also found for malignant neoplasms of the esophagus (SMR, 7.26; 95% CI, 3.87-12.42) and diseases of the digestive system (SMR, 2.03; 95% CI, 1.11-3.40). The remaining disease categories produced no altered risk estimates. Circulatory disease mortality was borderline statistically significant (SMR, 1.24; 95% CI, 1.00-1.52; P = 0.053) for those with a specialized intestinal metaplasia diagnosis of BE. In the cancer incidence analyses, esophageal malignancies (SIR, 8.66; 95% CI, 4.73-14.53) and esophageal adenocarcinomas (SIR, 14.29; 95% CI, 7.13-22.56) were found to be increased in BE. All remaining analyses provided unaltered risks, including that of colorectal cancer.
  
  
  CONCLUSIONS
  This study has shown evidence of an increased risk of esophageal cancer incidence and mortality in BE. It has also shown that those who have a histologic BE diagnosis may also have an increased risk of circulatory disease mortality.
authors: Centre for Epidemiology and Biostatistics, Leeds Institute of Genetics, Health, and Therapeutics, University of Leeds, Arthington House, Cookridge Hospital, Leeds LS16 6QB, United Kingdom.
authors: Michael B
authors: MB
authors: Cook
authors: Christopher P
authors: CP
authors: Wild
authors: Simon M
authors: SM
authors: Everett
authors: Laura J
authors: LJ
authors: Hardie
authors: Kamal E
authors: KE
authors: Bani-Hani
authors: Iain G
authors: IG
authors: Martin
authors: David
authors: D
authors: Forman
mesh_terms: D000230:Adenocarcinoma / Q000401:mortality*; D000328:Adult; D000368:Aged; D001471:Barrett Esophagus / Q000401:mortality*; D002294:Carcinoma, Squamous Cell / Q000401:mortality*; D002423:Cause of Death; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D004739:England; D004938:Esophageal Neoplasms / Q000401:mortality*; D005260:Female; D005770:Gastrointestinal Neoplasms / Q000401:mortality; D006801:Humans; D008297:Male; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary / Q000401:mortality*; D011230:Precancerous Conditions / Q000401:mortality*; D012307:Risk Factors; D047368:Tumor Burden