July 13, 2020

SURF study long term results

Long term outcomes from SURF clinical trial of RFA for low grade dysplasia confirms strong benefit in risk of HGD or esophageal adenocarcinoma.

SURF study long term results

Gastrointest Endoscopy. 2020 Mar 23;S0016-5107(20)33996-1.
doi: 10.1016/j.gie.2020.03.3756. Online ahead of print.

Radiofrequency ablation for low-grade dysplasia in Barrett's esophagus: long-term outcome of a randomized trial

Roos E Pouw  1 , Esther Klaver  1 , K Nadine Phoa  1 , Frederike G van Vilsteren  1 , Bas L Weusten  2 , Raf Bisschops  3 , Erik J Schoon  4 , Oliver Pech  5 , Hendrik Manner  6 , Krish Ragunath  7 , Jacobo Ortiz Fernández-Sordo  7 , Grant Fullarton  8 , Massimiliano Di Pietro  9 , Wladyslaw Januszewicz  9 , Dermot O'Toole  10 , Jacques J Bergman

PMID: 32217112 DOI: 10.1016/j.gie.2020.03.3756 


Background and aims: A prior randomized study (Surveillance versus Radiofrequency Ablation study [SURF study]) demonstrated that radiofrequency ablation (RFA) of Barrett's esophagus (BE) with confirmed low-grade dysplasia (LGD) significantly reduces the risk of esophageal adenocarcinoma. Our aim was to report the long-term outcomes of this study.

Methods: The SURF study randomized BE patients with confirmed LGD to RFA or surveillance. For this retrospective cohort study, all endoscopic and histologic data acquired at the end of the SURF study in May 2013 until December 2017 were collected. The primary outcome was rate of progression to high-grade dysplasia (HGD)/cancer. All 136 patients randomized to RFA (n = 68) or surveillance (n = 68) in the SURF study were included. After closure of the SURF study, 15 surveillance patients underwent RFA based on patient preference and study outcomes.

Results: With 40 additional months (interquartile range, 12-51), the total median follow-up from randomization to last endoscopy was 73 months (interquartile range, 46-85). HGD/cancer was diagnosed in 1 patient in the RFA group (1.5%) and in 23 in the surveillance group (33.8%) (P = .000), resulting in an absolute risk reduction of 32.4% (95% confidence interval [CI], 22.4%-44.2%) with a number needed to treat of 3.1 (95% CI, 2.3-4.5). Seventy-five of 83 patients (90%; 95% CI, 82.1%-95.0%) treated with RFA for BE reached complete clearance of BE and dysplasia. BE recurred in 7 of 75 patients (9%; 95% CI, 4.6%-18.0%), mostly minute islands or tongues, and LGD in 3 of 75 (4%; 95% CI, 1.4%-11.1%).

Conclusions: RFA of BE with confirmed LGD significantly reduces the risk of malignant progression, with sustained clearance of BE in 91% and LGD in 96% of patients, after a median follow-up of 73 months. (Clinical trial registration number: NTR1198.).