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Expression of programmed cell death protein 1 ligand 1 (PD-L1) on tumor cells (TC; (A), magnification 200×) and intra- and peritumoral macrophages (B), magnification 100×). Strong homogenous staining for major histocompatibility complex class I (MHC I) (C), magnification 100×) and membrane-pattern CD8 positive lymphocytes in oropharyngeal squamous cell carcinoma (OPSCC; (D), magnification 100×).
