(BE). It also suggests that patients with no symptoms of chronic reflux can be considered for screening, which could significantly increase the number of people eligible for screening.
Current AGA guidelines support endoscopic screening for BE followed by surveillance for the early detection of BE, dysplasia, and neoplasia. However, fewer than 20% of patients eventually diagnosed with esophageal adenocarcinoma (EAC) were previously diagnosed with BE, suggesting that many opportunities for early detection are missed.
The clinical practice update, published online in Clinical Gastroenterology and Hepatology, represents an effort to highlight advances in screening and surveillance with the goal of improving uptake. The main thrust of the document is risk factors other than gastroesophageal reflux disease (GERD) when considering candidates for screening.
In practice, physicians are already starting to employ other risk factors to select patients for screening, according to coauthor Srinadh Komanduri, MD, who is a professor of medicine and surgery at Northwestern University, Chicago. Specifically, the update suggests screening for individuals with at least three established risk factors for EAC and BE. Risk factors include male sex, non-Hispanic White race, age over 50 years, history of smoking, chronic GERD, obesity, or a family history of BE or EAC.
Another purpose of the update is to highlight noninvasive screening tools, especially nonendoscopic cell collection devices. The authors stress that upper endoscopy with biopsies remains the preferred method for BE diagnosis, but methods that are simple, patient-friendly, and cost-effective have the potential to increase the screened population. One option is transnasal endoscopy, which can be performed in the office with no sedation, but this is expensive and requires expertise.
Recently developed nonendoscopic cell collection devices include Cytosponge (Medtronic GI Solutions), EsoCheck (Lucid Diagnostics), and EsophaCap (Capnostics). All are safe and well-tolerated, and they have good sensitivity for BE. The Cytosponge consists of a swallowable piece of polyurethane foam fitted into a capsule that is attached to suture. The capsule dissolves and the foam expands, collecting cells, and is then withdrawn. It has undergone extensive testing in BE screening in the United Kingdom and was found to have a sensitivity of 80% and specificity of 92.2%. A primary care study showed a 10-fold increase in BE detection compared with usual care.
The EsophaCap works similarly to the Cytosponge but with a smaller diameter. It has 93% sensitivity and 93% specificity for intestinal metaplasia when combined with a panel of five methylated DNA biomarkers.
The EsoCheck device consists of a balloon attached to a catheter, which is inflated and withdrawn. Ridges on the balloon surface capture cells for analysis. A pilot study using two biomarkers found a 90.3% sensitivity and 91.7% specificity.
The update also advises use of high-definition white light endoscopy (HD-WLE) and virtual chromoendoscopy (VC) for screening and surveillance. An updated meta-analysis showed the two methods combined led to a higher detection rate of high grade dysplasia/EAC than HD-WLE alone (14.7% versus 10.1%; relative risk, 1.44). VC and traditional chromoendoscopy have similar dysplasia detection rates, but the former is recommended since it is readily available, requires no extra costs, and avoids issues that can affect dye-based chromoendoscopy. VC from any manufacturer is acceptable, but most data supporting its utility focuses on narrow-band imaging only.
The authors of the update did not suggest a minimum procedure time because of insufficient data, but they noted that the European Society for Gastrointestinal Endoscopy and United European Gastroenterology recommend a minimum of 7 minutes for upper endoscopy and a minimum of 1 minute per centimeter of the circumferential extent of the Barrett’s mucosa.
The update advises use of the Seattle biopsy protocol for sample during screening and surveillance exams. This includes four-quadrant biopsies taken every 1-2 cm, as well as biopsies from visible lesions. This protocol, however, is not followed in up to 20% of procedures, according to one study. Conceding that fact, the authors also suggest the use of wide area transepithelial sampling (WATS-3D) as a supplementary technique for BE segment sampling.
The Seattle biopsy protocol is associated with a higher dysplasia detection rate (RR, 2.75). This criterion can still be met even if an endoscopist chooses to send a patient for endoscopic resection rather than sample a visible lesion.