Fibrin Glue After ESD for High Risk Patients of Bleeding

Inclusion Criteria: * ECOG performance status 0-1 * Patients scheduled to undergo ESD due to gastric tumor (dysplasia, early gastric cancer) * Patients who are expected to have an iatrogenic ulcer size of 40mm or more after endoscopic submucosal dissection, or are taking aspirin, antiplatelet drugs, or anticoagulants * Patients who show adequate patient compliance and have adequate geographic distance for follow-up observation. Exclusion Criteria: * Patients with sensitivity to cow protein or its derived ingredients * Patients who had previously undergone partial gastrectomy * Patients with early gastric cancer at the site previously undergoing ESD * Patients with clinically significant cardiopulmonary disease * Patients with active hepatitis, liver disease that is not well controlled by treatment, or severe liver disorder * Patients with severe renal impairment * Patients with severe bone marrow dysfunction * Patients with severe blood clotting impairment (including hemophilia) * Patients with serious neurological or mental illness (e.g. epilepsy or dementia) * Patients with reported side effects of contrast media * Pregnant and lactating women * Patients who have not obtained the informed consent of the patient and guardian * Patients who are inadequate for clinical trials as judged by the attending physician