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Random effects models estimated overall and stratified pooled prevalence rates.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A total of 69 studies, including 33\u00a0002 OAC patients (53 studies) and 2712 patients with OGJAC (28 studies) were included. The pooled prevalence of prior Barrett's oesophagus diagnosis in OAC was 11.8% (95% confidence interval [CI] 8.4%\u201015.6%). The prevalence of prior Barrett's oesophagus diagnosis was higher in single\u2010centre resection studies (16.0%, 95% CI 8.7%\u201024.9%) than population\u2010based cancer registry studies (8.4%, 95% CI 5.5%\u201011.9%). The prevalence of concurrent Barrett's oesophagus in OAC was 56.6% (95% CI 48.5%\u201064.6%). Studies with 100% early stage OAC had higher prevalence of concurrent Barrett's oesophagus (91.3%, 95% CI 82.4%\u201097.6%) than studies with &lt;50% early OAC (39.7%, 95% CI 33.7%\u201045.9%). In OGJAC, the prevalence of prior and concurrent Barrett's oesophagus was 23.2% (95% CI 7.5%\u201044.0%) and 26.3% (95% CI 17.8%\u201035.7%), respectively.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Most patients with OAC have Barrett's oesophagus. Our meta\u2010analysis found ~12% of OAC patients had prior Barrett's diagnosis, but concurrent Barrett's oesophagus was found in ~57% at the time of OAC diagnosis. This represents a considerable missed opportunity for Barrett's oesophagus screening.<\/jats:p><\/jats:sec>","DOI":"10.1111\/apt.15760","type":"journal-article","created":{"date-parts":[[2020,5,26]],"date-time":"2020-05-26T10:06:32Z","timestamp":1590487592000},"page":"20-36","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":70,"title":["Systematic review with meta\u2010analysis: prevalence of prior and concurrent Barrett's oesophagus in oesophageal adenocarcinoma patients"],"prefix":"10.1111","volume":"52","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6113-4780","authenticated-orcid":false,"given":"Mimi C.","family":"Tan","sequence":"first","affiliation":[{"name":"Section of Gastroenterology and Hepatology Department of Medicine Baylor College of Medicine Houston TX USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nabil","family":"Mansour","sequence":"additional","affiliation":[{"name":"Section of Gastroenterology and Hepatology Department of Medicine Baylor College of Medicine Houston TX USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Donna L.","family":"White","sequence":"additional","affiliation":[{"name":"Section of Gastroenterology and Hepatology Department of Medicine Baylor College of Medicine Houston TX USA"},{"name":"Houston VA HSR&amp;D Center for Innovations in Quality, Effectiveness and Safety Michael E. 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