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Two head and neck squamous cell carcinoma samples (A, D, haematoxylin and eosin) analysed with the 22C3 PharmDx assay (B, E) and the SP263 assay (C, F). Programmed death‐ligand 1 expression as determined with the 22C3 and SP263 antibodies shows similar combined positive score (CPS) values in the two cases (A–C, CPS ≥ 20; D–F, CPS < 20).
