Banding Without Resection in Small Subepithelial Tumours

INCLUSION CRITERIA: * Age between 18 and 80 years old. * Endoscopic ultrasound (EUS) image of a gastrointestinal subepithelial tumour (SET) ≤15-mm. * Patient capable of understanding and signing informed consent form. * Patient understanding the type of study and complying with the follow-up of complementary tests during the study duration. EXCLUSION CRITERIA: * SETs \>15-mm. * SETs with clear diagnosis of EUS benign semiology: ie., lipoma, ectopic pancreas. * Patients with multiple SETs (e.g., carcinoids). * Vascular SETs (Doppler effect by EUS). * Severe coagulation disorder: INR \>1.5 not correctible with administration of plasma and/or platelets \<50,000/mm3. * Conditions that preclude upper digestive endoscopy, such as stenosis. * Pregnancy or breast-feeding. * Failure to sign informed consent form. * Patients with functional diversity who are unable to understand the nature and possible consequences of the study, unless there is a competent legal representative. * Patients unable to adhere to subsequent follow-up requirements. * Patients with a life expectancy of less than 12 months.