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• W2900738779 abstract "Context.— Clinical responses to anti–programmed death receptor-1 and anti–programmed death ligand-1 (PD-L1) agents are generally improved in patients with high PD-L1 expression compared with those with low/negative expression across several tumor types, including urothelial carcinoma. Objective.— To validate a PD-L1 immunohistochemical diagnostic test in urothelial carcinoma patients treated with the anti–PD-L1 monoclonal antibody durvalumab. Design.— The Ventana PD-L1 (SP263) assay was validated for intended use in urothelial carcinoma formalin-fixed, paraffin-embedded samples in studies addressing sensitivity, specificity, robustness, and precision, and implemented in study CD-ON-MEDI4736-1108 (NCT01693562). Efficacy was analyzed in patients classified according to prespecified PD-L1 expression cutoffs: PD-L1 high (if &gt;1% of the tumor area contained tumor-associated immune cells, ≥25% of tumor cells or ≥25% of immune cells stained for PD-L1; if ≤1% of the tumor area contained immune cells, ≥25% of tumor cells or 100% of immune cells stained for PD-L1) and PD-L1 low/negative (did not meet criteria for PD-L1 high). Results.— The assay met all predefined acceptance criteria for sensitivity, specificity, and precision. Interreader and intrareader precision overall agreement were 93.0% and 92.4%, respectively. For intraday reproducibility and interday precision, overall agreement was 99.2% and 100%, respectively. Interlaboratory overall agreement was 92.6%. In study CD-ON-MEDI4736-1108, durvalumab demonstrated clinical activity and durable responses in both PD-L1–high and PD-L1–low/negative subgroups, although objective response rates tended to be higher in the PD-L1–high subgroup than in the PD-L1–low/negative subgroup. Conclusions.— Determination of PD-L1 expression in urothelial carcinoma patients using the Ventana PD-L1 (SP263) assay was precise, highly reproducible, and clinically relevant." @default.
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• W2900738779 date "2018-11-20" @default.
• W2900738779 modified "2023-10-14" @default.
• W2900738779 title "Analytical Validation and Clinical Utility of an Immunohistochemical Programmed Death Ligand-1 Diagnostic Assay and Combined Tumor and Immune Cell Scoring Algorithm for Durvalumab in Urothelial Carcinoma" @default.
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• W2900738779 doi "https://doi.org/10.5858/arpa.2017-0555-oa" @default.
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