The standard operation for gastric cancer is carried out for advanced gastric cancer with serosal invasion accompanying patent disseminative metastasis to the peritoneum of the omental bursa and lymph node metastases. It consists of subtotal or total gastrectomy, omentobursectomy and extended lymph node dissection. An early stage cancer, which in Japan accounts for almost a half of the resectable cases of gastric cancer, shows no serosal invasion, and lymph node metastases are rare if the cancer remains intramucosal. Such cases represent about a half the cases of the early stage cancer. The diagnosis of the early stage cancer, especially if it remains intramucosal, is made by means of preoperative radiological and endoscopic examinations and intraoperative examination. Since 1977 we have been performing a modified operation as well for cases of the early stage cancer. The surgical procedure is as follows: reduction in the size of gastric resection by 2/3, pylorus-preserving gastrectomy and proximal gastric resection; preservation of the distal portion of the greater omentum and transverse incision of the upper abdomen instead of upper midline incision to prevent ileus due to intestinal adhesion to abdominal wound around umbilicus; sparing bursectomy; narrowing the area of lymph node dissection; sparing thoracotomy for cancer in the esophagogastric junction; sparing splenopancreatectomy; preservation of the hepatic branch of the vagal nerve and postoperative temporary oral administration of cholagogue to prevent postgastrectomy cholelithiasis. In addition, the primary lesion is isolated from the blood circulation by means of ligation of the drainage veins to diminish metastasis through the blood vessels (hepatic metastasis, etc.), which is the main cause recurrence after surgery for the early stage cancer. The results of this new surgery are satisfactory; the five-year postoperative survival rate is 100.0% and it reduced the time needed for surgery, anesthesia and blood transfusion.