Per oral endoscopic tumor (POET) resection for treatment of upper gastrointestinal subepithelial tumors

  • Philip Wai Yan ChiuEmail author
  • Hon Chi Yip
  • Anthony Yuen Bun Teoh
  • Vivien Wai Yin Wong
  • Shannon Melissa Chan
  • Simon Kin Hung Wong
  • Enders Kwok Wai Ng
Endoluminal Surgery



Endoscopic submucosal tunneling has evolved to allow endoscopic resection of subepithelial tumors of gastrointestinal tract without full-thickness perforation. This study aimed to investigate safety and efficacy of submucosal tunnel resection for these tumors.


Patients with subepithelial tumors (SET) located in esophagus, gastric cardia, lesser curvature, and antrum were recruited. The size of tumor was limited to < 40 mm. The procedures were performed under general anesthesia. A mucosal entrance was created 2 cm proximal to the SET after submucosal injection. Submucosal tunnel was then extended and the tumor was dissected and mobilized with intact overlying mucosa. After complete dissection, the tumors would be retrieved per orally and mucosal entrance closed by endoclips.


From June 2012 to December 2016, 51 patients with subepithelial tumors received POET. 39 patients had SET in stomach, 11 located in esophagus, and 1 in duodenum. The mean operative time was 90.46 ± 46.49 min, while the mean size of the tumors was 20.71 ± 14.05 mm. The POET was converted to endoscopic full-thickness resection (EFTR) in three patients with gastric subepithelial tumors located at greater curvature. The overall complication rate was 4.0%, and there was no bleeding, mucosal dehiscence, or leakage. The time to resume diet was 1.7 days, while the average hospital stay was 3.2 ± 1.0 days. The mean follow-up period was 19 ± 16 months, and only 1 patient developed recurrence of leiomyoma.


Per oral endoscopic tumor resection is safe and effective treatment for esophageal and gastric SET located at cardia, lesser curvature, and antrum. Currently, POET for treatment of upper GI SET is limited by the size and location of the tumor.


Subepithelial tumors Upper gastrointestinal tract Submucosal tunnel endoscopic resection Per oral endoscopic tumor resection Therapeutic endoscopy 


Compliance with ethical standards


Philip Wai Yan Chiu, Hon Chi Yip, Anthony Yuen Bun Teoh, Vivien Wai Yin Wong, Shannon Melissa Chan, Simon Kin Hung Wong, and Enders Kwok Wai Ng have no conflicts of interest or financial ties to disclose.

Supplementary material

Supplementary material 1 (WMV 43755 KB)

Supplementary material 2 (WMV 195413 KB)

Supplementary material 3 (WMV 110928 KB)


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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Division of Upper GI and Metabolic Surgery, Department of Surgery and State Key Laboratory of Digestive Diseases, Institute of Digestive DiseaseThe Chinese University of Hong KongHong Kong S.A.R.The People’s Republic of China

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