This is a report of 152 patients with gastric ulcer treated by ulcerectomy, vagotomy, and drainage. In the series, 123 patients were operated on electively and 29 were operated on acutely for bleeding, with operative mortality rates of 1.3% and 6.9%, respectively. The operative mortality rate for the whole series was 2.6%. Of 144 patients followed up, 94 were cured and 25 were improved. The remaining 25 patients were reoperated on, 20 for recurrent ulcer, 2 for early postoperative gastric retention, 2 for dumping and reflux gastritis, and 1 for stenosing ulcer in the esophagus. In the group of 119 successfully treated patients, moderate side effects were observed, including diarrhea in 5.2% and dumping in 8.6%. In 26 patients, the mean reduction of histamine-stimulated or pentagastrin-stimulated acid output was 72.2% when the response to insulin stimulation was 0, 45.1% when the response to insulin was between 0 and 2 mEq acid per hour, and 12.4% when the response was higher. The frequency of positive insulin tests postoperatively was 77.8% among patients with recurrent ulcer, 40% among improved patients, and 10.8% among cured patients. Of 4 patients with ulcer recurrence and negative insulin tests, 3 had gastric retention and 1 hypergastrinemia.