We therefore examined whether genes nominated by our screen were co-expressed with CD274 (encoding the PDL1 protein) in HNSCC tumors using publicly available RNAseq data from the Cancer Genome Atlas HNSCC project (n = 566, UCSC cancer genomics browser (xenabrowser.net), accessed on 4 October 2019; Table 3). This evidence concerns the gene CD274 and head and neck squamous cell carcinoma.