This trial is a single-center, prospective phase II clinical study, which mainly evaluates the efficacy and safety of first-line treatment with pembrolizumab in patients with recurrent and/or metastatic head and neck squamous cell carcinoma with PDL1 CPS≥20 in China.
This trial is main evaluate the efficacy and safety of pembrolizumab in the first-line treatment of Chinese patients with recurrent or metastatic head and neck squamous cell carcinoma with PD-L1 CPS≥20.