title: Biopsy surveillance is still necessary in patients with Barrett's oesophagus despite new endoscopic imaging techniques.
abstract: OBJECTIVE
  Endoscopic surveillance including stepwise four quadrant biopsies (4QB) is still regarded as the standard approach in patients with Barrett's oesophagus (BO). Several methods such as dye staining with methylene blue (MB) and tissue autofluorescence (AF) have been advocated to reduce the number of biopsies. We assessed their sensitivity and specificity compared with the standard approach-that is, endoscopy with 4QB-in the surveillance of a mixed BO population.
  
  
  METHODS
  Thirty five consecutive BO patients (mean age 64.9 years; 30 men, five women) were included in the study. AF endoscopy was followed by high resolution video endoscopy (VE) plus tissue staining with 0.5% MB. Biopsies were taken from any suspicious area found on any of the above tests, in addition to 4QB every 2 cm. The results were classified as either positive or negative for the various tests used. Histopathological results were used as the reference standard.
  
  
  RESULTS
  In the 35 study patients, a total of 345 biopsies showed low grade dysplasia (LGD) in 88 biopsies, high grade dysplasia (HGD) in 19 biopsies, and carcinoma in 12 biopsies. The sensitivity and specificity rates for AF and MB for the diagnosis of cancer or dysplasia versus BO mucosa without dysplasia were 21%/91% and 37%/91%, respectively. 4QB revealed five cancer/HGD areas and 76 LGD areas not detected by AF, MB, or VE. The additional yield of MB and AF over VE with 4QB concerned only one HGD area (in the vicinity of a cancer) and seven LGD areas.
  
  
  CONCLUSIONS
  Due to their low sensitivity, AF and MB are not suitable techniques for reducing the high numbers of routine biopsies needed for finding additional foci of HGD or cancer. Careful endoscopic observation and stepwise four quadrant biopsy therefore still represent the gold standard for surveillance of Barrett's oesophagus.
authors.affiliation: Department of Internal Medicine II, Technical University of Munich, Munich, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Egger
authors.forename: M
authors.initials: M
authors.lastname: Werner
authors.forename: A
authors.initials: A
authors.lastname: Meining
authors.forename: R
authors.initials: R
authors.lastname: Ott
authors.forename: H-D
authors.initials: HD
authors.lastname: Allescher
authors.forename: H
authors.initials: H
authors.lastname: Höfler
authors.forename: M
authors.initials: M
authors.lastname: Classen
authors.forename: T
authors.initials: T
authors.lastname: Rösch
mesh_terms: D000230:Adenocarcinoma / Q000473:pathology*; D000328:Adult; D000368:Aged; D001471:Barrett Esophagus / Q000473:pathology*; D001706:Biopsy; D016009:Chi-Square Distribution; D004396:Coloring Agents; D018450:Disease Progression; D004938:Esophageal Neoplasms / Q000473:pathology*; D004945:Esophagoscopy; D004947:Esophagus / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D008751:Methylene Blue; D008875:Middle Aged; D011230:Precancerous Conditions / Q000473:pathology*; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity; D014741:Video Recording
chemical_list: D004396:Coloring Agents; D008751:Methylene Blue