The authors evaluate the results of extensive lymph node dissection for gastric cancer at 50 patients. It has been found that the lymph node dissection did not increase the risk of operation. The mortality rate was 2%. The average number of removed and histologically examined lymph nodes was 26. The extensive lymph node dissection and the accurate histology provided opportunity for precise staging. Their first evaluation of survival showed an encouraging improvement of prognosis regard to that of patients survival treated by traditional surgical method. Besides it they reviewed the classification of Japanese Research Society for Gastric Cancer for the lymph drainage of the stomach and the surgical technique of the lymph node dissection.