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Objective Lymph node(LN)metastasis is the most reliable prognostic indicators for patients with gastric cancer who underwent curative resection [1-3].The International Union Against Cancer(UICC)and the American Joint Committee on Cancer(AJCC)tumor,node,metastasis(TNM)staging system defines pN0 disease as gastric cancer without LN metastasis,regardless of the number of total examined LNs(ELNs)[4].However,the UICC/AJCC TNM staging system also recommends that at least 16 or 30 LNs should be examined to determine pN0 classification.