Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4127942 | Annales de Pathologie | 2016 | 9 Pages |
Abstract
Therapies targeting immune checkpoints, in particular programmed death 1 (PD-1) and its ligand programmed death ligand 1 (PD-L1), are major new strategies for the treatment of several malignancies including mestatatic non-small cell lung cancer (NSCLC). The identifiation of predictive biomarkers of response is required, considering efficacy, cost and potentiel adverse events. Expression of PD-L1 by immunohistochemistry has been associated with higher response rate and overall survival in several clinical trials evaluating anti-PD-1 and anti-PD-L1 monoclonal antibodies. Thus, PD-L1 immunohistochemical companion assays could be required for treatment with some of these therapies in NSCLC. However, heterogeneity in methodologies of PD-L1 assays in terms of primary antibodies and scoring algorithms, and tumor heterogenity for PD-L1 expression are important issues to be considered. More studies are required to compare the different assays, ensure their harmonization and standardization and identify the optimal conditions for testing. PD-L1 expression is likely an imperfect predictive biomarker for patient selection and association with other markers of the tumor immune microenvironment will be probably necessary in the future.
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Authors
Julien Adam, David Planchard, Aurélien Marabelle, Jean-Charles Soria, Jean-Yves Scoazec, Sylvie Lantuéjoul,