 This is a single-blinded randomized control trial trying to compare the effectiveness of diagnosis between two techniques employed in tissue sampling for subepithelial tumors SETs of the gastrointestinal tract. Over 2 years, patients having SET will be randomized to either get the EUS-guided core needle biopsy EUS-CNB or EUS-guided single-incision with needle knife SINK technique. This is of grave importance because the diagnosis of the myriad types of SETs is made histologically requiring a good sample. 