研究单位：[1]Tianjin Medical University Cancer Institute and Hospital,Tianjin,Tianjin,China,300060[2]Sichuan Cancer Hospital and Research Institute[3]Henan Cancer Hospital[4]Shanxi Province Cancer Hospital[5]Hunan Cancer Hospital[6]The First Affiliated Hospital with Nanjing Medical University[7]The Fourth Hospital of Hebei Medical University
研究目的：
This study is a multi-center, non-interventional study. Clinicopathologic, treatment , outcome and efficacy data will be collected from medical records in metastatic esophageal squamous cell carcinoma (ESCC) patients.
