 The purpose of this study is to prospectively compare the efficacy and safety of EUS-CNB with SINK in patients with upper GI SETs. The investigators hypothesis is that the SINK technique will be superior to the EUS-CNB in obtaining a histological specimen. The results of the study would provide data which may improve the diagnostic ability for SETs. This in turn will guide appropriate surveillance or management surgical or endoscopic for patients with these lesions. 