研究单位：[1]Tianjin Medical University Cancer Institute and Hospital[2]Sichuan Cancer Hosiptal,Chengdu,Sichuan,China
研究目的：
The purpose of this study is to determine the efficacy and safety of pulsed radiotherapy given concomitantly with Tislelizumab and as maintenance therapy in participants with locoregionally recurrent head and neck squamous cell carcinoma ( HNSCC).
