Study of Gastroduodenal Metallic Stent vs Gastrojejunostomy

Inclusion Criteria: * Patients aged ≥19 to 80 years * ECOG performance status 0-3 * Life expectancy \>3 months * Patients with malignant gastric outlet obstruction (distal part of stomach, pyloric ring or duodenal bulb obstruction) caused by gastric cancer * Patients who are not eligible for radical operation due to local progression of gastric cancer, distant metastasis or his/her general condition. * Patients with GOOSS score 0-2 * Patients with symptoms consistent with gastric outlet obstruction including persistent nausea and vomiting * Patients with findings consistent with malignant gastric outlet obstruction on imaging studies including upper GI endoscopy, upper GIseries or abdominal computed tomography (CT) * Patients who are eligible to undergo both gastroduodenal stent placement and gastrojejunostomy (eligibility will be determined by agreement by at least one gastroenterological surgeon and at least one radiologist) * Patients who have been provided with an explanation of the procedures of the clinical trial, voluntarily decided participation and signed the informed consent form Exclusion Criteria: * Pregnant or lactating women * Women of childbearing potential with positive pregnancy test at baseline. Post-menopausal women should have at least 12 months of amenorrhea to be considered not of childbearing potential. * Patients who have previously undergone balloon dilatation or stent placement for malignant gastric outlet obstruction * Patients with past history of palliative bypass surgery or gastrectomy * Patients with peritoneal metastasis or multiple intestinal obstruction caused by other cause on imaging scan including abdominal CT or small bowel series * Patients who have been treated for intestinal adhesion caused by previous abdominal surgery * Patients who are not eligible for general anesthesia due to poor general condition * Patients with clinical evidence of intestinal perforation or peritonitis * Patients who are determined to be not eligible for stent placement or gastrojejunostomy due to other cause