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Kopczynska M, Ratcliffe E, Yalamanchili H, Thompson A, Nimri A, Britton J, Ang Y. Barrett's oesophagus with indefinite for dysplasia shows high rates of prevalent and incident neoplasia in a UK multicentre cohort. J Clin Pathol 2023; 76:847-854. [PMID: 36150885 DOI: 10.1136/jcp-2022-208524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 09/14/2022] [Indexed: 11/04/2022]
Abstract
AIMS Barrett's oesophagus with indefinite for dysplasia (IDD) carries a risk of prevalent and incident dysplasia and oesophageal adenocarcinoma. This study seeks to determine the risk of neoplasia in a multicentre prospective IDD cohort, along with determining adherence to British Society of Gastroenterology (BSG) guidelines for management and histology reporting. METHODS This was a cohort study using prospectively collected data from pathology databases from two centres in the North West of England (UK). Cases with IDD were identified over a 10-year period. Data were obtained on patient demographics, Barrett's endoscopy findings and histology, outcomes and histological reporting. RESULTS 102 biopsies with IDD diagnosis in 88 patients were identified. Endoscopy was repeated in 78/88 (88%) patients. 12/78 progressed to low-grade dysplasia (15% or 2.6 per 100 person years), 6/78 (7.7%, 1.3 per 100 person years) progressed to high-grade dysplasia and 6/78 (7.7%, 1.3 per 100 person years) progressed to oesophageal adenocarcinoma. The overall incidence rate for progression to any type of dysplasia was 5.1 per 100 person years. Cox regression analysis identified longer Barrett's segment, multifocal and persistent IDD as predictors of progression to dysplasia. Histology reporting did not meet 100% adherence to the BSG histology reporting minimum dataset prior to or after the introduction of the guidelines. CONCLUSIONS IDD carries significant risk of progression to dysplasia or neoplasia. Therefore, careful diagnosis and management aided by clear histological reporting of these cases is required to diagnose prevalent and incident neoplasia.
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Affiliation(s)
- Maja Kopczynska
- Gastroenterology Department, Northern Care Alliance NHS Foundation Trust, Salford, Manchester, UK
- Faculty of Medical and Human Sciences, The University of Manchester, Manchester, UK
| | - Elizabeth Ratcliffe
- Faculty of Medical and Human Sciences, The University of Manchester, Manchester, UK
- Gastroenterology Department, Wrightington Wigan and Leigh NHS Foundation Trust, Wigan, UK
| | - Harika Yalamanchili
- Gastroenterology Department, Wrightington Wigan and Leigh NHS Foundation Trust, Wigan, UK
| | - Anna Thompson
- Gastroenterology Department, Northern Care Alliance NHS Foundation Trust, Salford, Manchester, UK
| | - Adib Nimri
- Gastroenterology Department, Northern Care Alliance NHS Foundation Trust, Salford, Manchester, UK
| | - James Britton
- Gastroenterology Department, Northern Care Alliance NHS Foundation Trust, Salford, Manchester, UK
| | - Yeng Ang
- Gastroenterology Department, Northern Care Alliance NHS Foundation Trust, Salford, Manchester, UK
- Faculty of Medical and Human Sciences, The University of Manchester, Manchester, UK
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Davison JM, Goldblum JR, Duits LC, Khoshiwal AM, Bergman JJ, Falk GW, Diehl DL, Khara HS, Smolko C, Arora M, Siegel JJ, Critchley-Thorne RJ, Thota PN. A Tissue Systems Pathology Test Outperforms the Standard-of-Care Variables in Predicting Progression in Patients With Barrett's Esophagus. Clin Transl Gastroenterol 2023; 14:e00631. [PMID: 37622544 PMCID: PMC10684217 DOI: 10.14309/ctg.0000000000000631] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 07/25/2023] [Indexed: 08/26/2023] Open
Abstract
INTRODUCTION Objective risk stratification is needed for patients with Barrett's esophagus (BE) to enable risk-aligned management to improve health outcomes. This study evaluated the predictive performance of a tissue systems pathology [TSP-9] test (TissueCypher) vs current clinicopathologic variables in a multicenter cohort of patients with BE. METHODS Data from 699 patients with BE from 5 published studies on the TSP-9 test were evaluated. Five hundred nine patients did not progress during surveillance, 40 were diagnosed with high-grade dysplasia/esophageal adenocarcinoma (HGD/EAC) within 12 months, and 150 progressed to HGD/EAC after 12 months. Age, sex, segment length, hiatal hernia, original and expert pathology review diagnoses, and TSP-9 risk classes were collected. The predictive performance of clinicopathologic variables and the TSP-9 test was compared, and the TSP-9 test was evaluated in clinically relevant patient subsets. RESULTS The sensitivity of the TSP-9 test in detecting progressors was 62.3% compared with 28.3% for expert-confirmed low-grade dysplasia (LGD), while the original diagnosis abstracted from medical records did not provide any significant risk stratification. The TSP-9 test identified 57% of progressors with nondysplastic Barrett's esophagus (NDBE) ( P < 0.0001). Patients with NDBE who scored TSP-9 high risk progressed at a similar rate (3.2%/yr) to patients with expert-confirmed LGD (3.7%/yr). The TSP-9 test provided significant risk stratification in clinically low-risk patients (NDBE, female, short-segment BE) and clinically high-risk patients (IND/LGD, male, long-segment BE) ( P < 0.0001 for comparison of high-risk classes vs low-risk classes). DISCUSSION The TSP-9 test predicts risk of progression to HGD/EAC independently of current clinicopathologic variables in patients with BE. The test provides objective risk stratification results that may guide management decisions to improve health outcomes for patients with BE.
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Affiliation(s)
- Jon M. Davison
- University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | | | - Lucas C. Duits
- Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | | | | | - Gary W. Falk
- Perelman School of Medicine University of Pennsylvania, Philadelphia, Pennsylvania, USA
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Perisetti A, Desai M, Bourke MJ, Penman I, Repici A, Reddy DN, Tajiri H, Rex DK, Hassan C, Sharma P. Production and possible reduction of greenhouse gases produced during GI endoscopy activity: a systematic review of available literature. Gut 2023; 72:493-500. [PMID: 36522150 DOI: 10.1136/gutjnl-2022-328369] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Accepted: 10/29/2022] [Indexed: 01/07/2023]
Abstract
BACKGROUND AND AIMS Greenhouse gases (GHGs) that trap heat in the atmosphere are composed of carbon dioxide (CO2), methane, nitrous oxide and fluorinated gases (synthetic hydrofluorocarbons, perfluorocarbons and nitrogen trifluoride). In the USA, the health sector accounts for 8.5% of total GHG emissions. The primary objective of this systematic review was to critically analyse the carbon emissions data from GI endoscopic activity. DESIGN The GI endoscopy carbon cycle was evaluated at preprocedural, intraprocedural and postprocedural levels. We performed a systematic literature search of articles published on these issues until 30 June 2022 and discussed these available data on endoscopy unit GHG carbon cycle, barriers to reduce GHG emissions and potential solutions. The inclusion criteria were any full-text articles (observational, clinical trials, brief communications, case series and editorials) reporting waste generation from GI endoscopy. Abstracts, news articles and conference proceedings were excluded. RESULTS Our search yielded 393 records in PubMed, 1708 in Embase and 24 in Google Scholar. After application of inclusion and exclusion factors, we focused on 9 fulllength articles in detail, only 3 of them were cross-sectional studies (all from the USA), the others reviews or position statements. Therefore, the quality of the studies could not be assessed due to heterogeneity in definitions and amount of emissions. CONCLUSIONS Recognition of carbon emissions generated by GI endoscopy activity is critical. Although multiple limitations exists for quantification of these emission, there is an urgent need for collecting proper data as well as examining novel methods for reduction of these emissions for a sustainable endoscopic practices in the future.
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Affiliation(s)
- Abhilash Perisetti
- Gastroenterology and Hepatology, Kansas City VA Medical Center, Kansas City, Missouri, USA
| | - Madhav Desai
- Gastroenterology, Kansas City VA Medical Center, Kansas City, Missouri, USA
| | - Michael J Bourke
- Gastroenterology and Hepatology, Westmead Hospital, Westmead, New South Wales, Australia
| | - Ian Penman
- Gastroenterology and Hepatology, Centre for Liver & Digestive Disorders, Royal Infirmary Edinburgh, Edinburgh, UK
| | - Alessandro Repici
- Department of Gastroenterology, IRCCS Istituto Clinico Humanitas, Rozzano, Milano, Italy.,Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Milano, Italy
| | - Duvvur Nageshwar Reddy
- Asian Healthcare Foundation, Asian Institute of Gastroenterology, Hyderabad, Andhra Pradesh, India
| | - Hisao Tajiri
- Endoscopy, The Jikei University School of Medicine, Tokyo, Japan
| | - Douglas K Rex
- Gastroenterology and Hepatology, Indiana University School of Medicine, Indiana University Hospital, Indianapolis, Indiana, USA
| | - Cesare Hassan
- Department of Gastroenterology, IRCCS Istituto Clinico Humanitas, Rozzano, Milano, Italy.,Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Milano, Italy
| | - Prateek Sharma
- Gastroenterology and Hepatology, Kansas City VA Medical Center, Kansas City, Missouri, USA .,Department of Internal Medicine, University of Kansas School of Medicine, Kansas City, Missouri, USA
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Shah SN, Chehade NEH, Tavangar A, Choi A, Monachese M, Chang KJ, Samarasena JB. Hybrid argon plasma coagulation in Barrett's esophagus: a systematic review and meta-analysis. Clin Endosc 2023; 56:38-49. [PMID: 36733989 PMCID: PMC9902689 DOI: 10.5946/ce.2022.179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2022] [Accepted: 08/01/2022] [Indexed: 01/31/2023] Open
Abstract
BACKGROUND/AIMS Patients with Barrett's esophagus are at increased risk of developing esophageal adenocarcinoma. Endoscopic therapies aim to eradicate dysplastic and metaplastic tissues. Hybrid argon plasma coagulation (hybrid-APC) utilizes submucosal fluid injection to create a protective cushion prior to ablation that shields the submucosa from injury. We performed a pooled meta-analysis to evaluate the safety and efficacy of hybrid-APC. METHODS We conducted a systematic search of major electronic databases in April 2022. Studies that included patients with dysplastic and non-dysplastic Barrett's esophagus undergoing treatment with hybrid-APC were eligible for inclusion. Outcome measures included complete remission of intestinal metaplasia (CR-IM), stricture formation, serious adverse events, and number of sessions necessary to achieve CR-IM. RESULTS Overall pooled CR-IM rate for patients undergoing hybrid-APC was 90.8% (95% confidence interval [CI], 0.872-0.939; I2=0%). Pooled stricture rate was 2.0% (95% CI, 0.005-0.042; I2=0%). Overall serious adverse event rate was 2.7% (95% CI, 0.007-0.055; I2=0%). CONCLUSION Results of the current meta-analysis suggest that hybrid-APC is associated with high rates of CR-IM and a favorable safety profile. Interpretation of these results is limited by the inclusion of retrospective cohort and case series data. Randomized controlled trials that standardize treatment and outcome evaluation protocols are necessary to understand how this treatment option is comparable to the current standards of care.
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Affiliation(s)
- Sagar N. Shah
- Department of Internal Medicine, Los Angeles Medical Center, University of California, Los Angeles, CA, USA
| | - Nabil El Hage Chehade
- Division of Internal Medicine, MetroHealth Medical Center, Case Western Reserve University, Cleveland, OH, USA
| | - Amirali Tavangar
- H.H. Chao Comprehensive Digestive Disease Center and Division of Gastroenterology/Hepatology, University of California, Irvine, CA, USA
| | - Alyssa Choi
- H.H. Chao Comprehensive Digestive Disease Center and Division of Gastroenterology/Hepatology, University of California, Irvine, CA, USA
| | - Marc Monachese
- H.H. Chao Comprehensive Digestive Disease Center and Division of Gastroenterology/Hepatology, University of California, Irvine, CA, USA
| | - Kenneth J. Chang
- H.H. Chao Comprehensive Digestive Disease Center and Division of Gastroenterology/Hepatology, University of California, Irvine, CA, USA
| | - Jason B. Samarasena
- H.H. Chao Comprehensive Digestive Disease Center and Division of Gastroenterology/Hepatology, University of California, Irvine, CA, USA,Correspondence: Jason B. Samarasena H.H. Chao Comprehensive Digestive Disease Center and Division of Gastroenterology/Hepatology, University of California, Irvine 333 City Blvd West Suite 400, Orange, CA 92868, USA E-mail:
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Wolfson P, Ho KMA, Wilson A, McBain H, Hogan A, Lipman G, Dunn J, Haidry R, Novelli M, Olivo A, Lovat LB. Endoscopic eradication therapy for Barrett's esophagus-related neoplasia: a final 10-year report from the UK National HALO Radiofrequency Ablation Registry. Gastrointest Endosc 2022; 96:223-233. [PMID: 35189088 DOI: 10.1016/j.gie.2022.02.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Accepted: 02/09/2022] [Indexed: 12/11/2022]
Abstract
BACKGROUND AND AIMS Long-term durability data for effectiveness of radiofrequency ablation (RFA) to prevent esophageal adenocarcinoma in patients with dysplastic Barrett's esophagus (BE) are lacking. METHODS We prospectively collected data from 2535 patients with BE (mean length, 5.2 cm; range, 1-20) and neoplasia (20% low-grade dysplasia, 54% high-grade dysplasia, 26% intramucosal carcinoma) who underwent RFA therapy across 28 UK hospitals. We assessed rates of invasive cancer and performed detailed analyses of 1175 patients to assess clearance rates of dysplasia (CR-D) and intestinal metaplasia (CR-IM) within 2 years of starting RFA therapy. We assessed relapses and rates of return to CR-D (CR-D2) and CR-IM (CR-IM2) after further therapy. CR-D and CR-IM were confirmed by an absence of dysplasia and intestinal metaplasia on biopsy samples taken at 2 consecutive endoscopies. RESULTS Ten years after starting treatment, the Kaplan-Meier (KM) cancer rate was 4.1% with a crude incidence rate of .52 per 100 patient-years. CR-D and CR-IM after 2 years of therapy were 88% and 62.6%, respectively. KM relapse rates were 5.9% from CR-D and 18.7% from CR-IM at 8 years, with most occurring in the first 2 years. Both were successfully retreated with rates of CR-D2 of 63.4% and CR-IM2 of 70.0% 2 years after retreatment. EMR before RFA increased the likelihood of rescue EMR from 17.2% to 41.7% but did not affect the rate of CR-D, whereas rescue EMR after RFA commenced reduced CR-D from 91.4% to 79.7% (χ2P < .001). CONCLUSIONS RFA treatment is effective and durable to prevent esophageal adenocarcinoma. Most treatment relapses occur early and can be successfully retreated.
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Affiliation(s)
- Paul Wolfson
- Wellcome/EPSRC Centre for Interventional & Surgical Sciences, University College London, London, UK; Division of Surgery and Interventional Sciences, University College London, London, UK
| | - Kai Man Alexander Ho
- Wellcome/EPSRC Centre for Interventional & Surgical Sciences, University College London, London, UK; Division of Surgery and Interventional Sciences, University College London, London, UK; Gastrointestinal Services, University College London Hospital, London, UK
| | - Ash Wilson
- Division of Surgery and Interventional Sciences, University College London, London, UK
| | - Hazel McBain
- Gastrointestinal Services, University College London Hospital, London, UK
| | - Aine Hogan
- Division of Surgery and Interventional Sciences, University College London, London, UK
| | - Gideon Lipman
- Division of Surgery and Interventional Sciences, University College London, London, UK
| | - Jason Dunn
- Division of Surgery and Interventional Sciences, University College London, London, UK
| | - Rehan Haidry
- Division of Surgery and Interventional Sciences, University College London, London, UK; Gastrointestinal Services, University College London Hospital, London, UK
| | - Marco Novelli
- Research Department of Pathology, Cancer Institute, University College London Hospital, London, UK
| | - Alessandro Olivo
- Wellcome/EPSRC Centre for Interventional & Surgical Sciences, University College London, London, UK
| | - Laurence B Lovat
- Wellcome/EPSRC Centre for Interventional & Surgical Sciences, University College London, London, UK; Division of Surgery and Interventional Sciences, University College London, London, UK; Gastrointestinal Services, University College London Hospital, London, UK
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Spadaccini M, Vespa E, Chandrasekar VT, Desai M, Patel HK, Maselli R, Fugazza A, Carrara S, Anderloni A, Franchellucci G, De Marco A, Hassan C, Bhandari P, Sharma P, Repici A. Advanced imaging and artificial intelligence for Barrett's esophagus: What we should and soon will do. World J Gastroenterol 2022; 28:1113-1122. [PMID: 35431503 PMCID: PMC8985480 DOI: 10.3748/wjg.v28.i11.1113] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 08/12/2021] [Accepted: 02/13/2022] [Indexed: 02/06/2023] Open
Abstract
Barrett’s esophagus (BE) is a well-established risk factor for esophageal adenocarcinoma. It is recommended that patients have regular endoscopic surveillance, with the ultimate goal of detecting early-stage neoplastic lesions before they can progress to invasive carcinoma. Detection of both dysplasia or early adenocarcinoma permits curative endoscopic treatments, and with this aim, thorough endoscopic assessment is crucial and improves outcomes. The burden of missed neoplasia in BE is still far from being negligible, likely due to inappropriate endoscopic surveillance. Over the last two decades, advanced imaging techniques, moving from traditional dye-spray chromoendoscopy to more practical virtual chromoendoscopy technologies, have been introduced with the aim to enhance neoplasia detection in BE. As witnessed in other fields, artificial intelligence (AI) has revolutionized the field of diagnostic endoscopy and is set to cover a pivotal role in BE as well. The aim of this commentary is to comprehensively summarize present evidence, recent research advances, and future perspectives regarding advanced imaging technology and AI in BE; the combination of computer-aided diagnosis to a widespread adoption of advanced imaging technologies is eagerly awaited. It will also provide a useful step-by-step approach for performing high-quality endoscopy in BE, in order to increase the diagnostic yield of endoscopy in clinical practice.
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Affiliation(s)
- Marco Spadaccini
- Department of Endoscopy, Humanitas Research Hospital, IRCCS, Rozzano 20089, Italy
- Department of Biomedical Sciences, Humanitas University, Rozzano 20089, Italy
| | - Edoardo Vespa
- Department of Endoscopy, Humanitas Research Hospital, IRCCS, Rozzano 20089, Italy
- Department of Biomedical Sciences, Humanitas University, Rozzano 20089, Italy
| | | | - Madhav Desai
- Department of Gastroenterology and Hepatology, Kansas City VA Medical Center, Kansas City, MO 66045, United States
| | - Harsh K Patel
- Department of Internal Medicine, Ochsner Clinic Foundation, New Orleans, LA 70124, United States
| | - Roberta Maselli
- Department of Endoscopy, Humanitas Research Hospital, IRCCS, Rozzano 20089, Italy
- Department of Biomedical Sciences, Humanitas University, Rozzano 20089, Italy
| | - Alessandro Fugazza
- Department of Endoscopy, Humanitas Research Hospital, IRCCS, Rozzano 20089, Italy
| | - Silvia Carrara
- Department of Endoscopy, Humanitas Research Hospital, IRCCS, Rozzano 20089, Italy
| | - Andrea Anderloni
- Department of Endoscopy, Humanitas Research Hospital, IRCCS, Rozzano 20089, Italy
| | - Gianluca Franchellucci
- Department of Endoscopy, Humanitas Research Hospital, IRCCS, Rozzano 20089, Italy
- Department of Biomedical Sciences, Humanitas University, Rozzano 20089, Italy
| | - Alessandro De Marco
- Department of Endoscopy, Humanitas Research Hospital, IRCCS, Rozzano 20089, Italy
- Department of Biomedical Sciences, Humanitas University, Rozzano 20089, Italy
| | - Cesare Hassan
- Endoscopy Unit, Nuovo Regina Margherita Hospital, Roma 00153, Italy
| | - Pradeep Bhandari
- Department of Gastroenterology, Portsmouth Hospitals University NHS Trust, Portsmouth PO6 3LY, United Kingdom
- School of Pharmacy and Biomedical Sciences, University of Portsmouth, Portsmouth PO6 3LY, United Kingdom
| | - Prateek Sharma
- Department of Gastroenterology and Hepatology, Kansas City VA Medical Center, Kansas City, MO 66045, United States
| | - Alessandro Repici
- Department of Endoscopy, Humanitas Research Hospital, IRCCS, Rozzano 20089, Italy
- Department of Biomedical Sciences, Humanitas University, Rozzano 20089, Italy
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Hybrid APC in Combination With Resection for the Endoscopic Treatment of Neoplastic Barrett's Esophagus: A Prospective, Multicenter Study. Am J Gastroenterol 2022; 117:110-119. [PMID: 34845994 PMCID: PMC8715998 DOI: 10.14309/ajg.0000000000001539] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 09/27/2021] [Indexed: 12/11/2022]
Abstract
INTRODUCTION The current therapy of neoplastic Barrett's esophagus (BE) consists of endoscopic resection plus ablation, with radiofrequency ablation as the best studied technique. This prospective trial assesses a potential alternative, namely hybrid argon plasma ablation. METHODS Consecutive patients with neoplastic BE undergoing ablation after curative endoscopic resection (89.6%) or primarily were included into this prospective trial in 9 European centers. Up to 5 ablation sessions were allowed for complete eradication of BE (initial complete eradication of intestinal metaplasia [CE-IM]), by definition including BE-associated neoplasia, documented by 1 negative endoscopy with biopsies. The main outcome was the rate of initial CE-IM in intention-to-treat (ITT) and per-protocol (PP) samples at 2 years. The secondary end points were the rate of recurrence-free cases (sustained CE-IM) documented by negative follow-up endoscopies with biopsies and immediate/delayed adverse events. RESULTS One hundred fifty-four patients (133 men and 21 women, mean age 64 years) received a mean of 1.2 resection and 2.7 ablation sessions (range 1-5). Initial CE-IM was achieved in 87.2% of 148 cases in the PP analysis (ITT 88.4%); initial BE-associated neoplasia was 98.0%. On 2-year follow-up of the 129 successfully treated cases, 70.8% (PP) or 65.9% (ITT) showed sustained CE-IM; recurrences were mostly endoscopy-negative biopsy-proven BE epithelium and neoplasia in 3 cases. Adverse events were seen in 6.1%. DISCUSSION Eradication and recurrence rates of Barrett's intestinal metaplasia and neoplasia by means of hybrid argon plasma coagulation at 2 years seem to be within expected ranges. Final evidence in comparison to radiofrequency ablation can only be provided by a randomized comparative trial.
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