The purpose of this study is to assess the safety and efficacy of S-1 and oxaliplatin combined with radiation by Phase I/II study. The purpose of this study is as follows, * In phase I, to determine the dose limiting toxicities (DLTs) and the maximum tolerated dose (MTD). * In phase II, to evaluate the antitumor effect (pCR rate) and the safety .
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Phase I: Determine the Recommended dose (RD)
Timeframe: 10 weeks
Phase II: pathological complete response rate
Timeframe: 12-16 week