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Objective Gastric cancer is the second reason of cancer-related-deaths around the world.Lymphatic metastasis is the most important metastatic pathway of gastric cancer.The division of para-aortic lymph nodes was established in 1993 under the 12th edition of Japanese Gastric Cancer Treatment Guidelines.Since the 1960s,Paraaortic lymph node dissection(PAND)has proposed,and it was considered as the standard operation for advanced gastric cancer(AGC).