Long-term Outcomes of Submucosal Tunneling Endoscopic Resection for Upper Gastrointestinal Submucosal Tumors

STER is an effective and safe methodology for the resection of upper gastrointestinal submucosal tumors. Tumor size and shape impact on the piecemeal resection rate and procedural difficulty. STER for large tumors with irregular shape in the deep muscularis propria is also feasible but associated with relatively high risks of piecemeal resection and complications.