《Table 4 Comparison of baseline characteristics of patients and submucosal tumors between esophagus

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《Submucosal tunneling endoscopic resection: An effective and safe therapy for upper gastrointestinal submucosal tumors originating from the muscularis propria layer》

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a P<0.05，there is statistical significance between each other.GISTs:Gastrointestinal stromal tumors；NA:Not available.

From May 2012 to December 2017，173 patients with GI SMTs originating from the MP layer underwent STER.After 8 patients were excluded，165 patients were retrospectively enrolled，including 112 men and 53 women，with a mean age of 46.9±10.8 years.The median size of tumor sample was 20.0（range，5.0-80.0 mm）.Of the 165lesions，11（6.7%）were located in the upper esophagus，49（29.7%）in the middle esophagus，46（27.9%）in the lower esophagus，and 59（35.7%）in the cardia.Irregular lesions accounted for 48.5%of all lesions.Pathological diagnosis revealed that there were 157（95.2%）leiomyomas，3（1.8%）GISTs，3（1.8%）lipomas，1（0.6%）schwannoma，and 1（0.6%）fibrous tumor.The sizes of each of these three GISTs were 8.0 mm×8.0mm，24.0 mm×11.0 mm，and 25.2 mm×13.2 mm，while their mitotic rates were no more than 5/50 high-power fields.The detailed characteristics of the patients and SMTs are summarized in Table 1.