TSPO and head and neck squamous cell carcinoma: Thus, the aim of this study was to comprehensively evaluate the TSPO tracer, N,N-diethyl-2-(2-(4-([18F]fluoro)phenyl)-5,7-dimethylpyrazolo[1,5-a]pyrimidin-3-yl)acetamide ([18F]F-DPA) [24], in head and neck squamous cell carcinoma (HNSCC).