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Pathologic images of PD-L1 expression in samples from a representative patient. (A) The primary tumor revealed high PD-L1 expression (original magnification: 200×). (B) The tumor cells in lymphovascular spaces (arrow) did not express PD-L1 (original magnification: 200×). PD-L1, programmed death-ligand 1; TPS, tumor proportion score.
