title: Low incidence of adenocarcinoma and high-grade intraepithelial neoplasia in patients with Barrett's esophagus: a prospective cohort study.
abstract: OBJECTIVE
  Barrett's esophagus is a premalignant condition. The risk of developing high grade intraepithelial neoplasia (HGIN) or adenocarcinoma is currently a matter of debate. Due to several shortcomings, previous studies have probably overestimated the risk. The main aim of our study was to investigate the incidence of HGD and adenocarcinoma in a cohort of patients with Barrett's esophagus.
  
  
  METHODS
  In a prospective, cohort study, all patients had intestinal metaplasia and macroscopic evidence of short- or long-segment (< 3 cm or > or = 3 cm) Barrett's esophagus. All patients underwent a standard protocol including regular endoscopies with biopsies and were treated with a proton pump inhibitor or antireflux surgery.
  
  
  RESULTS
  A total of 135 patients underwent 623 endoscopies during 700 patient-years (mean follow-up 5.2 +/- 2.3 years). Simultaneous HGIN and adenocarcinoma were detected in two patients with long-segment Barrett's esophagus (1.5%; 2 and 6 years after the index endoscopy). Low grade intraepithelial neoplasia (LGIN) was detected in 25 patients (18.5%); in 11 of these patients (44%), LGIN was not confirmed in later biopsies. Our study shows an incidence of HGIN/adenocarcinoma of 1/350 patient-years. Endoscopic regression of Barrett's esophagus was seen in 20.7% of patients.
  
  
  CONCLUSIONS
  The incidence of HGIN/adenocarcinoma is low in patients with adequately treated Barrett's esophagus. The annual risk of developing HGIN/adenocarcinoma is 0.21% (1.6% in long-segment Barrett's esophagus).
authors.affiliation: Department of Hepatogastroenterology, IKEM (Institute for Clinical and Experimental Medicine), Prague, Czech Republic. jan.martinek@volny.cz
authors.forename: J
authors.initials: J
authors.lastname: Martinek
authors.forename: M
authors.initials: M
authors.lastname: Benes
authors.forename: P
authors.initials: P
authors.lastname: Brandtl
authors.forename: T
authors.initials: T
authors.lastname: Hucl
authors.forename: M
authors.initials: M
authors.lastname: Vasicek
authors.forename: L
authors.initials: L
authors.lastname: Voska
authors.forename: V
authors.initials: V
authors.lastname: Lanska
authors.forename: V
authors.initials: V
authors.lastname: Nosek
authors.forename: J
authors.initials: J
authors.lastname: Spicak
mesh_terms: D000230:Adenocarcinoma / Q000453:epidemiology*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001471:Barrett Esophagus / Q000453:epidemiology*; D002278:Carcinoma in Situ / Q000453:epidemiology*; D015331:Cohort Studies; D015897:Comorbidity; D004724:Endoscopy; D005260:Female; D016481:Helicobacter Infections / Q000453:epidemiology; D016480:Helicobacter pylori; D006551:Hernia, Hiatal / Q000453:epidemiology; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D018570:Risk Assessment