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Objective:The aim of the research was to investigate the relationship between gastric cancer stage,prognosis and blood platelets count.Methods:Platelet (PLT) count was analyzed retrospectively in 203 patients with gastric cancer from 1998 to 2002.The survivals of gastric cancer were compared between normal PLT group and thrombocytosis group.Results:Among 203 cases,PLT increased in 21 cases.The average platelet counts of patients at different stages had statistically significant differences (P＜0.01).The 3- and 5-year survivals in patients of thrombocytosis group were lower than those of the normal PLT group (P＜0.01).Conclusion:Thrombocytosis in gastric cancers with advanced stage are common.And PLT count can be a prognostic indicator of survival in patients with gastric cancer undergoing gastrectomy.