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Medline ® Abstract for Reference 30

of 'Barrett's esophagus: Surveillance and management'

Incidence of esophageal adenocarcinoma in Barrett's esophagus with low-grade dysplasia: a systematic review and meta-analysis.
Singh S, Manickam P, Amin AV, Samala N, Schouten LJ, Iyer PG, Desai TK
Gastrointest Endosc. 2014 Jun;79(6):897-909.e4. Epub 2014 Feb 17.
BACKGROUND: The natural history of low-grade dysplasia (LGD) in patients with Barrett's esophagus (BE) is unclear.
OBJECTIVE: We performed a systematic review and meta-analysis of studies that reported the incidence of esophageal adenocarcinoma (EAC) and/or high-grade dysplasia (HGD) among patients with BE with LGD.
DESIGN: Systematic review and meta-analysis of cohort studies.
PATIENTS: Patients with BE-LGD, with mean cohort follow-up ≥2 years.
MAIN OUTCOME MEASUREMENTS: Pooled incidence rates with 95% confidence intervals (CI) of EAC and/or BE-HGD.
RESULTS: We identified 24 studies reporting on 2694 patientswith BE-LGD, with 119 cases of EAC. Pooled annual incidence rates of EAC alone and EAC and/or HGD in patients with BE-LGD were 0.54% (95% CI, 0.32-0.76; 24 studies) and 1.73% (95% CI, 0.99-2.47; 17 studies). The results were stable across study setting and location and in high-quality studies. Substantial heterogeneity was observed, which could be explained by stratifying based on LGD/BE ratio as a surrogate for quality of pathology; the pooled annual incidence rates of EAC were 0.76% (95% CI, 0.44-1.09; 14 studies) for LGD/BE ratio <0.15 and 0.32% (95% CI, 0.07-0.58; 10 studies) for LGD/BE ratio>0.15. The annual rate of mortality not related to esophageal disease in patients with BE-LGD was 4.7% (95% CI, 3.2-6.2; 4 studies).
LIMITATIONS: Substantial heterogeneity was observed in the overall analysis.
CONCLUSION: The incidence of EAC among patients with BE-LGD is 0.54% annually. The LGD/BE ratio appears to explain the variation observed in the reported incidence of EAC in different cohorts. Conditions not related to esophageal disease are a major cause of mortality in patients with BE-LGD, although additional studies are warranted.
Division of Gastroenterology and Hepatology, Mayo Clinic College of Medicine, Rochester, Minnesota, USA.