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PD‐L1, transforming growth factor‐β (TGF‐β), and CD8 protein expression patterns in pre‐treated advanced thymic carcinoma specimens. A potential inverse relationship is observed between PD‐L1/TGF‐β and tumor‐infiltrating CD8+ T cells. A high CD8+ T cell tumor‐infiltrating pattern is observed in samples with a low level of PD‐L1/TGF‐β expression.
