This study aims to evaluate the role of early response assessment by 18F-FDG PET/CT in patients with recurrent and/or metastatic (R/M) head and neck squamous cell carcinoma with PD-L1 CPS \>1 treated with pembrolizumab monotherapy, in accordance with routine clinical practice.
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Predictive value of 18F-FDG PET/CT metabolic changes at 6 weeks for response to pembrolizumab
Timeframe: through study completion, an average of 1 year