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Background/Aims: The majority of studies on EUS-guided gastroenterostomy (EUS-GE) for palliation of malignant gastric outlet obstruction (GOO) have utilized a 15mm lumen apposing metal stent (LAMS). More recently, a 20mm LAMS has become available. The aim of this study was to compare rates of technical and clinical success, and adverse events (AEs) in patients undergoing EUS-GE using a 20mm vs 15mm LAMS. Methods: Patients who underwent EUS-GE with 15mm or 20mm LAMS for malignant GOO during the period of 1/2018-10/2020 were included. The primary outcome was clinical success, defined as an increase in the gastric outlet obstruction score (GOOS) by at least 1 point during follow-up. Secondary outcomes were technical success, maximum tolerated diet, rate of reintervention, and the rate/severity of AEs. Results: A total of 267 patients (mean age 67yr, F 43%) with malignant GOO from 19 centers underwent EUS-GE. The rate of clinical success was similar between the 15mm and 20mm stents (89.2% [95% CI 84.2-94.2] vs 84.1% [95%CI 77.4-90.6]). However, a significantly higher proportion of patients in the 20mm group tolerated a soft solid/complete diet at the end of follow-up (91.2% [95%CI 84.4-95.7] vs 81.2% [95%CI 73.9-87.2] p=0.04). Overall, AEs occurred in 33 (12.4% [95%CI 8.4-16.3]) patients, with rates being similar between 15mm and 20mm stents (12.8% [95%CI 7.5-18.2] vs 11.8% [95%CI 6-17.6]), including incidence of severe/fatal AEs (2% [95%CI 0.4-5.8] vs 3.4% [95%CI 0.9-8.4]). Conclusions: The 20mm LAMS is similar to the 15mm LAMS in terms of safety and efficacy for patients undergoing EUS-GE for malignant GOO. The 20 mm LAMS allows a more advanced diet and is, thus, the preferred LAMS during EUS-GE.

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