title: Argon plasma coagulation ablation versus endoscopic surveillance of Barrett's esophagus: late outcomes from two randomized trials.
abstract: OBJECTIVE
  Argon plasma coagulation (APC) has been used to ablate dysplastic and nondysplastic Barrett's esophagus. We determined the longer-term efficacy of APC ablation within two randomized controlled trials of APC versus surveillance for Barrett's esophagus in patients in whom gastroesophageal reflux was controlled by either surgery or proton pump inhibitors.
  
  
  METHODS
  129 patients (surgical trial 70, medical trial 59) with Barrett's esophagus (nondysplastic or low grade dysplasia) were randomly allocated to either ablation using APC or to continuing endoscopy surveillance. Outcomes were determined at three time points: short-term (12 months), mid-term (42-75 months) and long-term (> 84 months).
  
  
  RESULTS
  In the APC groups, initial ablation of > 95 % of the Barrett's esophagus was achieved in 61 of 63 patients; the > 95 % ablation persisted in 47 of 56 patients at short-term follow-up, in 33 of 49 at mid-term and in 21 of 32 at long-term follow-up. In the surveillance groups, the length of Barrett's esophagus reduced from a mean of 4.2 cm to 2.7 cm at long-term follow-up. High grade dysplasia (HGD) developed in 1 patient in the APC groups and in 3 in the surveillance groups. Low grade dysplasia developed in 1 APC patient and in 6 surveillance patients.
  
  
  CONCLUSIONS
  APC ablation reduced the extent of Barrett's esophagus, and this reduction was maintained in some patients at longer-term follow-up. However, progression to HGD can still occur despite APC ablation, suggesting endoscopic surveillance is still required.
  
  
  BACKGROUND
  ACTRN012607000293460 and ACTRN12607000292471 (Australian Clinical Trials Registry).
authors.affiliation: Flinders University Department of Surgery, Flinders Medical Centre, Bedford Park, South Australia.
authors.forename: Corina
authors.initials: C
authors.lastname: Sie
authors.forename: Tim
authors.initials: T
authors.lastname: Bright
authors.forename: Mark
authors.initials: M
authors.lastname: Schoeman
authors.forename: Philip
authors.initials: P
authors.lastname: Game
authors.forename: William
authors.initials: W
authors.lastname: Tam
authors.forename: Peter
authors.initials: P
authors.lastname: Devitt
authors.forename: David
authors.initials: D
authors.lastname: Watson
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D057908:Argon Plasma Coagulation; D001471:Barrett Esophagus / Q000209:etiology / Q000628:therapy*; D004945:Esophagoscopy; D005500:Follow-Up Studies; D005764:Gastroesophageal Reflux / Q000150:complications / Q000628:therapy; D006801:Humans; D008875:Middle Aged; D016037:Single-Blind Method; D016896:Treatment Outcome; D057832:Watchful Waiting