Background and study aims: Gastric outlet obstruction (GOO) is a late complication of advanced gastric, periampullary, and duodenal malignancies. Palliation of obstruction is the primary aim of treatment in these patients. Self-expandable metal stents have emerged as a promising treatment option. Our aim was to investigate the safety and efficacy of a new non-foreshortening nitinol duodenal stent. Patients and methods: A total of 52 patients with symptomatic malignant GOO were studied in this prospective multicenter cohort study. All patients received a D-Weave Niti-S duodenal stent (Taewoong Medical, Seoul, South Korea). Patients were followed up until withdrawal of informed consent or death. Results: The cause of GOO was pancreatic cancer in the majority of patients (62%). The technical and clinical success rates were 96% and 77%, respectively. The GOO Scoring System score improved significantly (P<0.0001) when the scores before stenting were compared with the mean scores until death. Median survival was 82 days and stent patency was observed in 75% for up to 190 days, accounting for death as a competing risk. In 13 patients (25%) stent dysfunction occurred (tumor ingrowth in 11, stent migration in two). Over time, the body mass index, the World Health Organization performance score, and the EuroQol visual analog scale revealed a not significant change (P=0.52, P=0.43, and P=0.15, respectively), whereas the global health status improved significantly (P=0.001). Conclusion: Placement of a new non-foreshortening nitinol enteral stent is safe and without major complications. This stent design produces significant relief of obstructive symptoms and improves quality of life in patients with incurable malignant GOO.

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van Hooft, J.E, van Montfoort, M.L, Jeurnink, S.M, Bruno, M.J, Dijkgraaf, M.G.W, Siersema, P.D, & Fockens, P. (2011). Safety and efficacy of a new non-foreshortening nitinol stent in malignant gastric outlet obstruction (DUONITI study): A prospective, multicenter study. Endoscopy, 43(8), 671–675. doi:10.1055/s-0030-1256383