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Objective The aim of this study was to analyze the prognosis of gastric cancer patients categorized as pT4aN0M0,pT1N3aM0/pT2N2M0/pT3N1M0 of stage ⅡB and stage ⅢA and to compare the optimistic prognostic stratification between the AJCC 8th edition staging system and the AJCC modified 8th(m8th)edition staging system by incorporating pT4aN0M0 into stage ⅢA.