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Immunocytochemistry/immunohistochemistry reagents intended to perform qualitative and/or quantitative assessment of the expression of the protein programmed cell death 1 ligand 1 (PD-L1). Analysis of PD-L1 expression may be used to characterize various cancers. In particular, PD-L1 expression levels aid in determining whether patients in whom lung cancer has been diagnosed are eligible for treatment with PD-1 immune checkpoint inhibitors.
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