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Study of S1 Efficacy and Toxicity as Second-line Treatment on Inoperable or Advanced Gastric Cancers
The primary purpose of the study is to investigate the correlation between the efficacy and toxicity of S-1 on gastric cancers and the expression of thymidylate synthase (TS), dihydropyrimidine dehydrogenase (DPD) and orotate phosphoribosyltransferase(OPRT).
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