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Tissue specimen of primary tumor sample and brain metastases. (a) Immunohistochemistry stained with PD-L1 primary antibody (28-8 pharmaDx; Dako) in a pretreated formalinfixed paraffin-embedded tissue of primary lung tumor before treatment, exhibiting strong membrane staining in 100% of tumor cells (20× magnification). (b) Cerebellar tissue specimen after complete resection.
