Surgery is the only curative therapy for gastric cancer and controversy still exist on the extend of surgery. As the lymphatic distribution of stomach is very complex, the determination of the actual lymph node involvement is important for making the decision in order to avoid complications. Sentinel node navigation surgery has recently been introduced is gastrointestinal tract cancer. Present article reviews the detection techniques of lymph nodes and significance of lymphadenectomies in gastric cancer. J. Surg. Oncol. 2008;98;476-481. (c) 2008 Wiley-Liss, Inc.