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United European Gastroenterology Journal logoLink to United European Gastroenterology Journal
. 2020 Jul 6;8(9):1086–1105. doi: 10.1177/2050640620939376

The global prevalence of Barrett’s esophagus: A systematic review of the published literature

Inês Marques de Sá 1,, Pedro Marcos 2, Prateek Sharma 3,4, Mário Dinis-Ribeiro 1,5
PMCID: PMC7724547  PMID: 32631176

Abstract

Background

Determining the prevalence of Barrett’s esophagus is important for defining screening strategies. We aimed to synthesize the available data, determine Barrett’s esophagus prevalence, and assess variability.

Methods

Three databases were searched. Subgroup, sensitivity, and meta-regression analyses were conducted and pooled prevalence was computed.

Results

Of 3510 studies, 103 were included. In the general population, we estimated a prevalence for endoscopic suspicion of Barrett’s esophagus of (a) any length with histologic confirmation of intestinal metaplasia as 0.96% (95% confidence interval: 0.85–1.07), (b) ≥1 cm of length with histologic confirmation of intestinal metaplasia as 0.96% (95% confidence interval: 0.75–1.18) and (c) for any length with histologic confirmation of columnar metaplasia as 3.89% (95% confidence interval: 2.25–5.54) . By excluding studies with high-risk of bias, the prevalence decreased to: (a) 0.70% (95% confidence interval: 0.61–0.79) and (b) 0.82% (95% confidence interval: 0.63–1.01). In gastroesophageal reflux disease patients, we estimated the prevalence with afore-mentioned criteria to be: (a) 7.21% (95% confidence interval: 5.61–8.81) (b) 6.72% (95% confidence interval: 3.61–9.83) and (c) 7.80% (95% confidence interval: 4.26–11.34). The Barrett’s esophagus prevalence was significantly influenced by time period, region, Barrett’s esophagus definition, Seattle protocol, and study design. There was a significant gradient East-West and North-South. There were minimal to no data available for several countries. Moreover, there was significant heterogeneity between studies.

Conclusion

There is a need to reassess the true prevalence of Barrett’s esophagus using the current guidelines in most regions. Having knowledge about the precise Barrett’s esophagus prevalence, diverse attitudes from educational to screening programs could be taken.

Keywords: Barrett metaplasia, epidemiology, prevalence, worldwide

Introduction

The incidence of esophageal adenocarcinoma (EAC) has been increasing.1 The poor prognosis of EAC has focused interest on Barrett’s esophagus (BE). Identification of BE with treatment of dysplasia is important to prevent invasive cancer. On the other hand, gastroesophageal reflux disease (GERD) has been associated with an increased risk of BE. Despite recommendations against population-based screening, the majority of guidelines recommend considering screening of chronic GERD patients. However, 50% of EAC patients report no previous GERD.25 Therefore, understanding the epidemiology of BE is difficult because the majority remain undiagnosed. Indeed, the prevalence of BE is unknown: some studies estimate a 15% prevalence in chronic GERD patients and 1–2% in the general population.6 The BE prevalence (priori probability) is important to define and evaluate screening strategy.

BE has been an area of controversy.13 Its definition and practice have varied along time and across the world.7,8 The Prague classification, described in 2006, has improved BE diagnosis and increased reliability in reporting.9 While the European, American Society for Gastrointestinal Endoscopy and American College of Gastroenterology define BE as intestinal metaplasia (IM) lining in the distal esophagus with a minimum length of 1 cm, the American Gastroenterological Association defines it as any extent of intestinal metaplasia and the British Society as any columnar metaplasia (CM) (fundic type, cardiac type, and intestinal type) lining in the distal esophagus with a minimum length of 1 cm.25

We aimed to synthesize the data of all studies assessing BE prevalence and determine its prevalence. We also aimed to assess the variability of BE prevalence according to the definition, geographical region, time period, and method used in order to identify the best methodology to determine it.

Methods

Search strategy

We conducted a systematic review according to the PRISMA guidelines. The research question was defined using the PICO acronym (P-population, I-intervention, C-comparator, O-outcome): what is the BE prevalence (O) in different settings (P) and which are the methodologies used (I). A sensitive search in PubMed, Scopus and Web of Knowledge was performed using the following query: “(prevalence(Title) OR epidemiolog*(Title) OR incidence(Title) OR risk(Title) OR screen*(Title)) AND (Barrett’s esophagus(Title/Abstract) OR Barrett(Title/Abstract) OR columnar-lined esophagus(Title/Abstract)).”

Selection of manuscripts

Inclusion criteria were original full-text articles published up to September 2018 and addressing BE in general and the GERD population, that met the globally accepted criteria for BE (endoscopic suspicion of BE (ESBE) with or without histologic confirmation of any CM or IM) and with a sample size of ≥100 individuals. The general population was defined as any population with or without gastrointestinal symptoms or with or without indication for esophagogastroduodenoscopy (EGD). Exclusion criteria were reviews, case-reports, case-control studies with BE cases, and non-English, non-French, non-Spanish, and non-Portuguese language. An attempt to contact corresponding authors was made when the full text was not available. When similar data was identified, we included the most recent report.

After all references (n = 3510) were imported and duplicated records were discarded, the records (n = 1531) were screened by title and abstract by two independent investigators (gastroenterology trainees). Concordance between the reviewers was measured by proportion of agreement and k-statistics achieving a good agreement (83% of agreement). Full-text eligibility was done by the same investigators. Conflicts were resolved through discussion.

Data extraction and quality assessment

A data extraction sheet was developed. Data were extracted independently by both investigators and then cross-checked by one. Studies were divided into the general and GERD population. The pooled BE prevalence was estimated according to its definition: ESBE with histologic confirmation of IM (any length or ≥1 cm of length), ESBE with histologic confirmation of CM (any length or ≥1 cm of length) and ESBE only (any length or ≥1 cm of length). The group “ESBE any length” included the studies from the group “ESBE≥1 cm of length.” For studies assessing ESBE with histologic confirmation of IM, sources of variability were evaluated.

The appraisal of study quality was done independently by both investigators using the STrengthening the Reporting of OBservational studies in Epidemiology (STROBE) checklist and the NewCastle-Ottawa Scale. Discrepancies were resolved through discussion.

Statistical analysis

The pooled prevalence was calculated using the random-effect model. Heterogeneity across studies was assessed by I2 statistic (<30%, 30–60%, 60–75% and >75% suggestive of low, moderate, substantial, and considerable heterogeneity, respectively). We explored sources of heterogeneity by subgroup analysis, sensitivity analysis, and meta-regression. We used the z-test for the logit of the prevalence to examine the impact of different factors (year of publication, geographical setting, sample size, percentage of male, type of sampling, Seattle protocol, and ESBE length) on estimates. After logit transformation, we analyzed publication bias using funnel plot and Egger’s test. Statistical significance was set at p<0.05. The STATA software was used.

Results

Study characteristics

After screening, 175 records were assessed for eligibility (Figure 1). We did not have access to 3% of these articles, with 66% unrecoverable records dating before 2006. We finally included 80 studies assessing BE prevalence in the general population (ESBE with IM: 49, ESBE with CM: 8 and ESBE only: 23) and 23 in the GERD population (ESBE with IM: 17, ESBE with CM: 1 and ESBE only: 5). Characteristics of studies are depicted in Table 1.10112 Of the 80 studies in the general population, 12 studies performed a subgroup analysis in GERD patients: 11 studies were included in the GERD analysis,10,15,19,23,27,30,32,42,43,56,79 but one was not included due to the small sample (n = 26). There was considerable heterogeneity among studies. There was no data available regarding BE prevalence in the general and GERD populations for the majority of countries (Figures 1 and 2, Supplementary Material).

Figure 1.

Figure 1.

Flowchart of study selection. (*51 articles only published as abstracts). BE: Barrett’s esophagus.

Table 1.

Characteristics of included studies.


General population
Study first author (year) Country Sampling Sample size Male (%) Mean age Caucasian (%)/African-American (%)/Asian (%) Quality of endoscopy reported ? How EGJ was defined ? Seattle protocol used? Esophagitis present during BE diagnosis? Prevalence (%)
Endoscopic suspicion of BE (ESBE) with histologic confirmation of intestinal metaplasia
ESBE≥1 cm
Prospective study
Crews (2016)10 USA Prospective population cohort 205 46 70 98.5/−/− Yes Gastric folds Unknown No 7.8
Jacobson (2011)11 USA Women that underwent EGD 20,167 0 30–55 (range) −/−/− No Unknown Unknown Unknown 0.73
Jung (2011)12 USA Prospective population cohort 182,605 63 89/−/− Yes Gastric folds Unknown Yes 0.22
Connor (2004)13 USA Patients with dyspepsia that underwent EGD 264 95 57 73/22/- Yes Gastric folds Unknown Yes 6.1
Pascarenco (2014)14 Romania Patients that underwent EGD 286 52.4 59.9 −/−/− Yes Gastric folds Yes Yes 6.6
Kuo (2010)15 Taiwan Patients that underwent EGD 736 51 50.5 −/−/− Yes Unknown Yes Yes 1.8
Cross-sectional study
Rex (2003)16 USA Patients that underwent colonoscopy 961 59.5 59 78/20.3/- Yes Gastric folds Yes No 3.3
Retrospective study
Khoury (2012)17 USA Patients that underwent EGD 7308 36.4 57.3 83/14/- Yes Gastric folds Yes Unknown 1.57
Kula (2007)18 Poland Patients that underwent EGD 6326 −/−/− Yes Unknown Yes Unknown 1.1
Elizondo (2017)19 Mexico Patients that underwent EGD 500 37.6 54 −/−/− Yes Gastric folds Yes No 1.8
Kim (2007)20 South Korea Patients that underwent 1st EGD 70,103 51 −/−/− Yes Gastric folds Unknown Yes 0.22
ESBE irrespective of length
Prospective study
Gerson (2002)21 USA Asymptomatic patients that underwent colonoscopy 110 91,8 61 73/14/4 Yes Gastric folds Yes Unknown 25
Gerson (2009)22 USA Asymptomatic women that underwent colonoscopy or EGD before bariatric surgery 126 0 58 (colonoscopy)42 (bariatric) 72/2/20 (colonoscopy) 71/19/2 (bariatric) Yes Unknown Yes Unknown 6
Zagari (2008)23 Italy Prospective population cohort 1033 −/−/− No Unknown Unknown Unknown 1.3
Zaninotto (2001)24 Italy Patients with dyspepsia that underwent their 1st EGD 240 51.7 56 −/−/− Yes Gastric folds No Unknown 0.83
GOSPE (1991)25 Italy Patients that underwent EGD 14,898 57.3 57 −/−/− Yes Unknown No Yes 0.46
Katsinelos (2013)26 Greece Patients with dyspepsia that underwent an EGD 1990 52 47.48 −/−/− Yes Gastric folds Yes Yes 3.8
Dina (2015)27 Romania Patients that underwent EGD 1261 53 57 −/−/− No Unknown Unknown Unknown 2.85
Jonaitis (2011)28 Lithuania Patients n with upper gastrointestinal symptoms that underwent EGD 4032 39.6 45.13 −/−/− Yes Gastric folds Yes Yes 0.82
Fagundes (2003)29 Brazil Patients that underwent EGD 1276 100/−/− No Unknown Unknown Unknown 0.63
Csendes (2000)30 Chile Patients with dyspepsia 306 32.7 48 −/−/− Yes Gastric folds No Yes 0
Amano (2006)31 Japan Patients that underwent EGD 1668 57.2 63.5 −/−/− Yes Gastric folds No Yes 6.4
Peng (2009)32 China Patients that underwent EGD 2580 49.5 45 −/−/− Yes Gastric folds Yes Yes 1.05
Zhang (2012)33 China Patients that underwent EGD 139,416 −/−/− Yes Gastric folds Yes Yes 0,17
Wong (2002)34 China Patients that underwent EGD 16,606 67.4 −/−/− No Unknown Unknown Yes 0.06
Yeh (1997)35 Taiwan Patients that underwent 1st EGD 464 43.3 47 −/−/96 No Unknown Unknown Unknown 1.98
Khamechian (2013)36 Iran Patients with dyspepsia that underwent their 1st EGD 1144 45.2 −/−/− Yes Unknown No Yes 3.7
Cross-sectional study
Chak (2014)37 USA Hospital cohort 177 100 58 41/58/- No Unknown Unknown Unknown 4.5
Ward (2006)38 USA Patients that underwent colonoscopy 300 54 71.8 (median) 83/14/2 Yes Unknown Yes Unknown 16.7
Spechler (1994)39 USA Patients that underwent EGD 156 48.7 53 90/7/1 Yes Gastric folds No Yes 10
van Zanten (2006)40 Canada Patients with dyspepsia that underwent their 1st EGD 1040 95/−/− No Unknown No Unknown 2.4
Johansson (2005)41 Sweden Patients that underwent 1st EGD 769 43 53 −/−/− Yes Gastric folds No Yes 3.8
Ronkainen (2005)42 Sweden Population sample 1000 49 53.5 (median) −/−/− Yes Gastric folds No Yes 1.6
Voutilaine (2000)43 Finland Patients that underwent EGD 1128 42 47 (median) −/−/− No Unknown Unknown Unknown 0.98
de Mas (1999)44 Germany Patients that underwent EGD 370 48.4 58.7 −/−/− No Unknown Unknown Unknown 10
Freitas (2008)45 Brazil Patients that underwent 1st EGD 104 49 65 85.6/−/− Yes Unknown Yes Unknown 3.8
Cárdenas (2010)46 Peru Patients that underwent EGD 11,970 −/−/− Yes Unknown No Yes 0.25
Chacaltana (2009)47 Peru Population cohort 2273 −/−/− No Unknown Unknown Unknown 0.48
Toruner (2004)48 Turkey Patients that underwent EGD 395 43.3 57 −/−/− Yes Gastric folds Yes Yes 7.4
Lee (2011)49 Malaysia Patients that underwent 1st EGD 1895 −/−/− No Unknown Unknown Yes 0.37
Rosaida (2004)50 Malaysia Patients with dyspepsia that underwent EGD 1000 44.2 51.1 −/−/68.9 No Unknown Unknown Unknown 2
Xiong (2010)51 China Patients that underwent EGD 2022 52 46.97 −/−/− Yes Gastric folds Yes Unknown 1.04
Lee (2003)52 South Korea Patients n with upper gastrointestinal symptoms that underwent EGD 1553 −/−/− Yes Intramucosal vessels No Yes 0.32
Fireman (2001)53 Israel Patients that underwent EGD 112 51.8 49.8 −/−/− Yes Unknown No Yes 2.7
Retrospective study
Bersentes (1998)54 USA Patients that underwent EGD 1541 98 65 75.9/1.7/<0.1 No Unknown Unknown Unknown 12.4
Robles (1995)55 Spain Patients that underwent EGD 5303 −/−/− No Unknown Unknown Unknown 0.53
De Carli (2017)56 Brazil Patients that underwent EGD 5996 −/−/− No Unknown Unknown Unknown 0.78
Peña (2005)57 Mexico Patients that underwent EGD 4947 −/−/− No Unknown Unknown Unknown 0.26
Yilmaz (2006)58 Turkey Patients that underwent EGD 18,766 −/−/− Yes Unknown Yes Yes 0.4
Endoscopic suspicion of BE (ESBE) with histologic confirmation of columnar metaplasia
ESBE≥1 cm
ESBE irrespective of length
Cross-sectional study
Siwiec (2012)59 USA Volunteers 150 −/−/− No Unknown Unknown Unknown 3.3
Connio (2001)60 USA Database with EGD Unknown −/−/− No Unknown Unknown Unknown 0.08
Cameron (1990)61 USA Autopsy with endoscopy performed in 83% of the autopsy esophagus 733 61 −/−/− No Unknown Unknown Unknown 0.95
Cameron (1992)62 USA Patients that underwent EGD 51,311 −/−/− No Unknown Unknown Yes 0.83
Coleman (2011)63 North Ireland Patients that underwent EGD 197,635 −/−/− No Unknown Unknown Unknown 4.7
Ford (2004)64 UK Patients that underwent EGD 20,417 48 56 69/5/26 No Unknown Unknown Yes 3.6
GOSPE (1991)25 Italy Patients that underwent EGD 14,898 57.3 57 −/−/− Yes Unknown No Yes 0.58
Taghipour-Zahir (2012)65 Iran Patients that underwent EGD 681 62.7 62.04 −/−/− No Unknown Unknown Unknown 18.86
Retrospective study
Andreollo (1997)66 Brazil Patients that underwent EGD 2381 −/−/− No Unknown Unknown Yes 2.57
Endoscopic suspicion of BE (ESBE)
ESBE≥1 cm
Cross-sectional study
Yamagishi (2008)67 Japan Patients that underwent EGD 6307 49.2 62.7 −/−/− No Intramucosal vessels NA Unknown 1.7
Azuma (2000)68 Japan Hospital cohort 650 79 52.6 −/−/− No Intramucosal vessels NA Unknown 3.12
ESBE irrespective of length
Prospective study
Zullo (2014)69 Italy Patients that underwent 1st EGD 1054 37 57.5 −/−/− No Unknown NA Unknown 1.6
Cross-sectional study
Akiyama (2010)70 Japan Patients that underwent EGD with intact stomach 160 75.6 68 (median) −/−/− Yes Gastric folds NA Unknown 47.5
Alexandropoulou (2012)71 UK National database Unknown −/−/− No Unknown NA Unknown 1.29
Blankenstein (2005)72 UK Patients that underwent 1st EGD 21,899 50 −/−/− No Unknown NA Unknown 2.25
Loffeld (2003)73 Netherlands Patients that underwent 1st EGD 11,691 −/−/− No Unknown NA Unknown 2.4
López-Colombo (2018)74 Mexico Patients that underwent EGD 239 45.6 53 −/−/− No Intramucosal vessels NA Unknown 23
Shimoyama (2012)75 Japan Patients that underwent EGD 832 40.7 67.6 −/−/− Yes Intramucosal vessels NA Yes 22.1
Okita (2008)76 Japan Patients that underwent EGD 5338 60 69 −/−/− Yes Gastric folds NA Unknown 37.6
Fujiwara (2003)77 Japan Patients that underwent EGD 548 54 57.3 −/−/− Yes Intramucosal vessels NA Unknown 12.2
Niu (2012)78 China Population cohort 1995 72 44 0/0/100 No Unknown NA Unknown 2.8
Zou (2011)79 China Population sample 1029 42.4 −/−/− No Unknown NA Yes 1.8
Tseng (2008)80 China Patients that underwent EGD 19,812 55.2 51.6 0/0/100 Yes Gastric folds NA Yes 0.28
Park (2009)81 Korea Patients that underwent EGD 25,536 59.5 46.7 0/0/100 No NA Yes 3.4
Choi (2002)82 Korea Patients that underwent EGD 847 45.1 48.7 −/−/− Yes Intramucosal vessels NA Yes 17
Masri (2015)83 Lebanon Patients that underwent EGD 16,787 −/−/− No Unknown NA Unknown 1.3
Rezailashkajani (2007)84 Iran Patients that underwent EGD 501 39 44.7 −/−/− No Unknown NA Yes 0.2
Retrospective study
Smith (2009)85 USA Patients that underwent EGD 135 12.6/1/- No Unknown NA Unknown 3.6
Masclee (2014)86 Netherlands National database 1,487,191 −/−/− No Unknown NA Unknown 0.15
Alcedo (2009)87 Spain Patients that underwent EGD 58,190 −/−/− No Unknown NA Yes 0.66
Fujimoto (2013)88 Japan Patients that underwent EGD 18,792 70.8 54.2 −/−/− No Unknown NA Unknown 7.9
Akiyama (2009)89 Japan Patients that underwent EGD 846 53 66 −/−/− Yes Gastric folds NA Yes 43
Endoscopic suspicion of BE (ESBE) with histologic confirmation of intestinal metaplasia
ESBE≥1 cm
Prospective study
Crews (2016)10 USA Prospective population cohort 68 −/−/− Yes Gastric folds Unknown No 8.8
Mathew (2011)90 India Patients with symptoms 278 53.6 39.97 −/−/− Yes Gastric folds Yes No 8.99
Kuo (2010)15 Taiwan Patients that underwent EGD 344 55.5 49.8 −/−/− Yes Unknown Yes Yes 3.8
Retrospective study
Elizondo (2017)19 Mexico Patients that underwent EGD 125 −/−/− Yes Gastric folds Yes No 7.2
ESBE irrespective of length
Prospective study
Romero (2002)91 USA Patients with GERD symptoms and no family relatives with BE 100 59 47 −/−/− Yes Gastric folds Yes Yes 6
Zagari (2015)23 Italy Prospective population cohort 458 −/−/− No Unknown Unknown Unknown 1.5
Dina (2015)27 Romania Patients that underwent EGD 527 −/−/− No Unknown Unknown Unknown 4.93
Fagundes (2003)29 Brazil Patients that underwent EGD 326 100/−/− No Unknown Unknown Unknown 2.5
Csendes (2003)92 Chile Patients that underwent EGD 1480 54.5 −/−/− Yes Gastric folds Yes Unknown 13.65
Csendes (2000)30 Chile Patients with symptoms 376 41.5 49 −/−/− Yes Gastric folds No Yes 11.4
Sharifi (2014)93 Iran Patients with symptoms 736 55.8 48.9 −/−/− Yes Unknown Yes Yes 4.6
Fouad (2009)94 Egypt Patients with symptoms 1000 76.4 38.81 −/−/− Yes Unknown Unknown No 7.3
Zhang (2012)95 China Patients that underwent EGD 593 57.1 −/−/− Yes Unknown Yes Unknown 4.6
Peng (2009)32 China Patients that underwent EGD 310 −/−/− Yes Gastric folds Yes Yes 5.2
Cross-sectional study
Ramirez (2008)96 USA Patients with symptoms 100 86 −/−/− Yes Gastric folds Yes Unknown 27
Ward (2006)38 USA Patients that underwent colonoscopy 105 −/−/− Yes Unknown Yes Unknown 19.8
Jobe (2006)97 USA Patients with symptoms 121 80 59 95/4/- Yes Gastric folds Yes Unknown 29.8
Winters (1987)98 USA Patients with symptoms 97 −/−/− No Unknown No Unknown 6.18
Ronkainen (2011)99 Sweden Population cohort 284 −/−/− Yes Unknown Unknown Yes 8.1
Ronkainen (2005)42 Sweden Population sample 399 −/−/− Yes Gastric folds No Yes 2.3
Voutilaine (2000)43 Finland Patients that underwent EGD 248 52 56 −/−/− No Unknown Unknown Unknown 4
Conio (1988)100 Italy Patients that underwent EGD 102 55.9 30–83 (range) −/−/− No Unknown Unknown Unknown 4.9
Wani (2014)101 India Patients with symptoms 378 66.7 48.15 −/−/− Yes Gastric folds Yes Unknown 2.38
Yin (2012)102 China Patients with symptoms 528 −/−/− Yes Gastric folds Yes Unknown 6.06
Retrospective study
Chavalitdhamrong (2011)103 USA Patients that underwent esophageal capsule endoscopy 502 54.9 54.2 −/−/− No Unknown Unknown Unknown 1.19
Banki (2005)104 USA Patients with symptoms 796 58 52 −/−/− No Gastric folds Yes Unknown 26
Spechler (2002)105 USA Patients that underwent EGD 2477 48 58 87.8/10/2 No Unknown Unknown Unknown 8.1
De Carli (2017)56 Brazil Patients that underwent EGD 1769 −/−/− No Unknown Unknown Unknown 2.7
Gado (2015)106 Egypt Patients that underwent EGD 433 59 45 −/−/− Yes Gastric folds No Unknown 1.2
Endoscopic suspicion of BE (ESBE) with histologic confirmation of columnar metaplasia
ESBE≥1 cm
ESBE irrespective of length
Cross-sectional study
Siwiec (2012)59 USA Volunteers 67 −/−/− No Unknown Unknown Unknown 4.5
Winters (1987)98 USA Patients with symptoms 97 −/−/− No Unknown No Unknown 12.3
Conio (1988)100 Italy Patients that underwent EGD 102 55.9 30–83 (range) −/−/− No Unknown Unknown Unknown 11.8
Arróspide (2003)107 Peru Patients that underwent EGD 345 49.6 −/−/− No Unknown Unknown Unknown 5.8
Endoscopic suspicion of BE (ESBE)
ESBE≥1 cm
ESBE irrespective of length
Prospective study
Lin (2018)108 USA Patients that underwent EGD 73,535 48.2 53.8 80.9/4.2/1.8 No Unknown NA Unknown 5.6
Kulig (2004)109 Germany, Austria, and Switzerland Hospital based-cohort 6215 53 54 99/−/− No Unknown NA Unknown 11
Pelechas (2013)110 Greece Patients with symptoms 406 63.1 48.7 −/−/− No Unknown NA Unknown 4.9
Cross-sectional study
Abdul-Razzak (2007)111 Jordan Patients that underwent EGD 100 50 37.62 −/−/− No Unknown NA Unknown 4
Zou (2011)79 China Population sample 48 −/−/− No Unknown NA Yes 2.1
Retrospective study
Nassif (2012)112 Brazil Patients that underwent EGD 207 34.78 47.43 −/−/− No Unknown NA Unknown 6.28

BE: Barrett’s esophagus; EGD: esophagogastroduodenoscopy; EGJ: means esophagogastric junction; ESBE: endoscopic suspicion of Barrett’s esophagus; GERD: gastroesophageal reflux disease; GOSPE: Gruppo Operativo per lo Studio delle Precancerosi dell’Esofago; NA: not applicable.

Figure 2.

Figure 2.

Figure 2.

Forest plot of all studies assessing the prevalence of endoscopic suspicion of Barrett’s esophagus (ESBE) any length with histologic confirmation of intestinal metaplasia (IM) (a), of ESBE ≥1 cm of length with histologic confirmation of IM (b), and of ESBE any length with histologic confirmation of columnar metaplasia (CM) (c) in general population.

BE prevalence according to various definitions

General population

The BE prevalence varied according to definition: 0.96% (95% confidence interval (CI95%): 0.85–1.07) for ESBE any length with IM, 0.96% (CI95%: 0.75–1.18) for ESBE ≥1 cm with IM, 3.89% (CI95%: 2.25–5.54) for ESBE any length with CM, 7.04% (CI95%: 6.35–7.74) for ESBE any length and 2.26% (CI95%: 0.90–3.61) for ESBE with ≥1 cm (Figure 2).

Regarding ESBE with IM, we analyzed the statistical outliers (Figure 2). Ward et al. (16.7% of BE prevalence) and Spechler et al. (10%) conducted studies in a population with a high prevalence of GERD. In the study of Spechler et al. and Pascarenco el al. (6.6%) esophagitis was present. Bersentes et al. (12.4%), Gerson et al. (2002) (20%) and Connor et al. (6.1%) conducted studies with a high percentage of males. In the study of Gerson et al. (2009) (6%), 50% of the population was obese/overweight. Bersentes et al., De Mas et al. (10%), Amano et al. (6.4%) and Toruner et al. (7.4%) did not consider ESBE≥1 cm. Crews et al. (7.8%) estimated BE prevalence by EGD and transnasal endoscopy in an older population. By excluding these outliers, the prevalence was: BE any length with IM – 0.70% (CI95%: 0.61–0.79); BE ≥1 cm with IM – 0.82% (CI95%: 0.63–1.01).10,13,14,21,22,31,38,39,44,48,54

GERD population

The BE prevalence varied based on the definition: 7.21% (CI95%: 5.61–8.81) for ESBE any length with IM, 6.72% (CI95%: 3.61–9.83) for ESBE ≥1 cm with IM, 7.80% (CI95%: 4.26–11.34) for ESBE any length with CM and 6.51% (CI95%: 3.34–9.68) for ESBE any length.

Regarding ESBE with IM, we analyzed the statistical outliers (Figure 3). Ward et al. (19.8% of BE prevalence) conducted a study in an older population. In the study of Jobe et al. (29.8%) and Ramirez et al. (27%) >80% were men. Banki et al. (26%) assessed patients that warrant evaluation for antireflux surgery. By excluding these studies, the pooled prevalence of ESBE any length with IM was 4.53% (CI95%: 3.46–5.60).38,96,97,104

Figure 3.

Figure 3.

Figure 3.

Forest plot of all studies assessing the prevalence of endoscopic suspicion of Barrett’s esophagus (ESBE) any length with histologic confirmation of intestinal metaplasia (IM) (a), of ESBE ≥1 cm of length with histologic confirmation of IM (b), and of ESBE any length with histologic confirmation of columnar metaplasia (CM) (c) in the gastroesophageal reflux disease (GERD) population.

Variability in the prevalence of BE

Geographical setting

General population

The pooled prevalence of BE in Western, Eastern and Latin American countries was 2.30% (CI95%: 1.94–2.65), 0.59% (CI95%: 0.45–0.73), and 0.51% (CI95%: 0.28–1.07) respectively (Figure 4). There was a North-South gradient in the West: in North was 2.97% (CI95%:2.44–3.50) and in South was 1.72% (CI95%:1.09–2.36).

Figure 4.

Figure 4.

Subgroup analysis of the pooled prevalence of Barrett’s esophagus (BE) in general population (a), and in gastroesophageal reflux disease (GERD) patients (b) for geographical setting, date of publication, length of endoscopic suspicion of Barrett’s esophagus (ESBE) considered, use of Seattle protocol, study design, and type of sampling.

GERD population

The pooled prevalence of BE in Western, Eastern, and Latin American countries was 9.30% (CI95%: 6.35–12.25), 4.73% (CI95%: 3.11–6.35) and 7.43% (CI95%: 2,50–8.81) respectively (Figure 4).

Time trends

General population

There was a temporal trend with the most recent studies reporting lower estimates especially in the West. Indeed, the BE prevalence was 0.80% (CI95%: 0.69–0.92) when considering only the studies published after 2006 (date of publications of Prague classification) while it was 1.96% (CI95%: 1.62–2.30) when considering only the studies published before 2006. This difference was also found in a subgroup analysis for Western (before: 4.05% (CI95%: 3.16–4.95) vs after: 1.71% (CI95%: 1.25–2.17)) and Eastern countries (before: 1.28% (CI95%: 0.81–1.74) vs after: 0.54% (CI95%: 0.45–0.73)) (Figure 4).

GERD population

Likewise, there was a temporal trend: 5.27% (CI95%: 3.79–6.76) when considering only the studies published after 2006 vs 8.80% (CI95%: 5.91–11.69) when considering only the studies published before 2006 (Figure 4).

Length of BE

General population

When comparing studies that considered ESBE with ≥1 cm with those that did not, the prevalence of BE was significantly different (0.96% (CI95%: 0.75–1.18) vs 2.31% (CI95%: 1.56–3.05)) (Figure 4).

GERD population

The prevalence of BE was similar between studies that considered ESBE ≥1 cm and studies that did not (6.72% (CI95%: 3.61–9.83) vs 7.27% (CI95%: 5.53–8.81)) (Figure 4).

Use of the Seattle protocol

General population

When comparing studies that used Seattle protocol with those that did not, the prevalence was significantly different (1.76% (CI95%: 0.85–1.07) vs 0.88% (CI95%: 0.74–1.02)) (Figure 4).

GERD population

When comparing studies that used Seattle protocol with those that did not, the prevalence was significantly different (10.67% (CI95%: 7.31–14.02) vs 4.62% (CI95%: 3.13–6.12))(Figure 4).

Study characteristics

General population

The studies with larger sample size, lower male percentage, and lower mean/median age had the lowest BE prevalence. Prospective studies estimated a higher BE prevalence than retrospective studies (1.34% (CI95%: 1.16–1.53) vs 0.74% (CI95%: 0.56–0.91)). When comparing studies that estimated BE prevalence in patients undergoing EGD and studies that estimated BE prevalence in population cohorts/sample (these studies proposed endoscopy to individuals from a cohort conducted for unrelated reasons to BE or GERD or from a population sample) there was no difference (0.96 (CI95%: 0.85–1.07) vs 0.87 (CI95%: 0.74–1.01)) (Figure 4).

GERD population

The studies with the larger sample size, lower percentage of males, and with lower mean/median age had a lower prevalence. The prevalence was similar between prospective and retrospective studies. There was no difference between studies that estimated BE prevalence in patients undergoing EGD and studies that estimated BE prevalence in population cohorts/sample. However, the BE prevalence significantly increased to 11.23% (CI95%: 7.04–15.41) if studies assessed patients with GERD (Figure 4).

Meta-regression

General population

The univariate analysis showed a significant relationship between the BE prevalence and the geographical setting, sample size, and percentage of males. Considering the univariate and the subgroup analysis, we included publication date, geographical setting, sample size, percentage of male, and ESBE≥1 cm as independent variables in a multivariate analysis. Although only sample size had a significant impact on BE prevalence (p<0.0001), 55.63% of cross-study variance could be explained by this model (R2 = 55.63%).

GERD population

The univariate analysis showed a significant relationship between pooled prevalence and the use of Seattle protocol. Considering the univariate and the subgroup analysis, we included year of publication, geographical setting, sample size, percentage of male, type of sampling, and Seattle protocol in a multivariate analysis. Although 64.96% of the variance inter-studies was explained by this model, only year of publication (p = 0.011) and type of sampling (p = 0.016) had a significant impact on BE prevalence.

Quality assessment

Among the 103 studies, 65% were at a high risk of bias due to sample characterization and 87% due to endoscopic practice (Supplementary Material Figure 3).

Publication bias

For the general population, the funnel plot and the Egger test (p = 0.1177) indicated low risk of bias. For the GERD population, although the funnel plot indicated low risk of bias, the p-value was 0.0016 with a z-statistic of -2.06 in the Egger test (Supplementary Material Figure 4).

Discussion

The poor prognosis of EAC has been focus attention to BE. Despite BE surveillance, EAC incidence has been rising, bringing into question whether the population at risk is being correctly identified. Indeed, the precise prevalence of BE is unknown.

This study is an important review assessing global BE prevalence according to the most recent guidelines and the first study assessing variability of BE prevalence due to BE definition, geographical region, time period, and methodology. We have found that there are no data available from the majority of the countries. In some countries, the estimations are higher than expected because of BE definition and methodology used (Supplementary Material Figures 1 and 2). We also found heterogeneity among the studies.

In the general population, we estimated a pooled prevalence of 0.96% (CI95%: 0.85–1.07) for ESBE any length with histologic confirmation of IM, 0.96% (CI95%: 0.75–1.18) for ESBE ≥1 cm of length with histologic confirmation of IM and 3.89% (CI95%: 2.25–5.54) for ESBE any length with histologic confirmation of CM. By excluding studies with high risk of bias, the prevalence of ESBE any length with histologic confirmation of IM was 0.70% (CI95%: 0.61–0.79) and of ESBE ≥1 cm of length with histologic confirmation of IM was 0.82% (CI95%: 0.63–1.01). Therefore, it would be necessary to perform endoscopy in 122 individuals of the general population for the diagnosis of one patient with BE. There is no difference in the prevalence between BE any length with IM and BE ≥1 cm with IM, because the first included the studies from the last group. Indeed, when comparing studies that considered ESBE with ≥1 cm with those that did not, the prevalence was significantly different (Figure 4). In GERD, we estimated a pooled prevalence of 7.21% (CI95%: 5.61–8.81) for ESBE any length with histologic confirmation of IM, 6.72% (CI95%: 3.61–9.83) for ESBE ≥1 cm of length with histologic confirmation of IM and, 7.80% (CI95%: 4.26–11.34) for ESBE any length with histologic confirmation of CM. The prevalence was significantly influenced by the date of publication, geographical setting, BE length, the use of Seattle protocol, and the study design. There was a significant gradient East-West and North-South of BE prevalence. By including studies prior to 2006, we found a temporal trend with the most recent studies reporting lower prevalence, particularly after Prague classification.9 Moreover, the presence of esophagitis was a source of bias, probably by making BE diagnosis difficult. The impact of ethnicity was not assessed since the studies did not estimate BE prevalence by ethnic group.

Shiota et al.113 conducted a systematic review of BE prevalence in Asia, estimating a BE prevalence of 1.3% (0.7–2.2) in the general population with high heterogeneity. This higher value might result from studies in high-risk patients and studies that diagnosed BE without IM confirmation. They also included studies that excluded patients with known BE (that estimated incidence). No study from this review was excluded in ours.113 Qumseya et al.114 have conducted a systematic review of 47 studies assessing BE prevalence in different risk populations. They included studies with less than 100 patients and studies that excluded patients with known BE. Moreover, the authors differentiate the prevalence of population without any risk factor (0.8%) from the prevalence of population with ≥50 years (6.7%). However, the majority of the studies included in the first group had a mean/median age higher than 50 years and the last group included studies with mean age of 45 years.114

The limitations of our analysis extend from the various biases within each study and the heterogeneity among studies impacting our meta-analysis. Although the BE prevalence varied based on the definition, we have attempted to provide precise estimates based on the population being evaluated (general vs GERD), BE length (any vs ≥1 cm), using Seattle protocol and geographical location.

Our findings confirm the need for well-conducted studies in order to accurately estimate BE prevalence and decrease heterogeneity. In the future, prospective population-based or EGD-based studies with a minimum sample size of 100 individuals and according to the most recent guidelines, namely using the definition of BE with ≥1 cm and histologic confirmation of IM, the Prague classification, the Seattle protocol, and in the absence of esophagitis, should be conducted.

Having knowledge about precise BE prevalence, we could draw more tailored screening strategies and ultimately assess their impact.

Supplemental Material

sj-pdf-1-ueg-10.1177_2050640620939376 - Supplemental material for The global prevalence of Barrett’s esophagus: A systematic review of the published literature

Supplemental material, sj-pdf-1-ueg-10.1177_2050640620939376 for The global prevalence of Barrett’s esophagus: A systematic review of the published literature by Inês Marques de Sá, Pedro Marcos, Prateek Sharma and Mário Dinis-Ribeiro in United European Gastroenterology Journal

Acknowledgements

The author contributions were as follows. IM: screening, data extraction, quality assessment, statistical analysis, and writing the manuscript; PM: screening, data extraction, and quality assessment; PS: guidance and review; MD: guidance and review.

Footnotes

Declaration of conflicting interests: The authors have no conflicts of interest to declare.

Ethics approval: Not applicable.

Funding: The authors received no financial support for the research, authorship, and/or publication of this article.

Informed consent: Not applicable.

ORCID iD: Inês Marques de Sá https://orcid.org/0000-0001-8835-7183

Supplemental material: Supplemental material for this article is available online.

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sj-pdf-1-ueg-10.1177_2050640620939376 - Supplemental material for The global prevalence of Barrett’s esophagus: A systematic review of the published literature

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