研究单位：[1]Chinese Academy of Medical Sciences[2]Sichuan Cancer Hospital and Research Institute[3]Tianjin Medical University Cancer Institute and Hospital
研究目的：
The purpose of this study is to determine the efficacy of preventive intensity modulated radiation therapy after surgery in stage T2-3N0M0 disease of thoracic esophageal squamous cell carcinoma(UICC 7th edition) and to identify the subgroup benefiting from the treatment.
