Abstract
Programmed cell death 1 (PD-1) plays an important role in subsiding immune responses, in promoting self-tolerance through suppressing the activity of T-cells, and in promoting differentiation of regulatory T-cells. One of its ligands, programmed cell death ligand 1 (PD-L1) acts as a checkpoint regulator in immune cells and is also expressed in a wide range of cancer types. Anti-PD therapy modulates immune responses at the tumor site, targets tumor-induced immune defects, and repairs ongoing immune responses. Since drugs that target the PD-1/PD-L1 pathways became available as a cancer treatment, there is need for the use of different antibodies to detect the presence of these proteins in tumoral samples by immunohistochemistry or other assays. Because the detection of these antigens in tumor samples is highly clinically informative for guiding treatment decisions, especially to establish the aptness of a patient to receive anti-PD therapy, it is necessary to have a validation process that guaranties that the test results obtained when using antibodies against these proteins are specific, selective, reproducible, and conducive to quantification of antigen abundance in cancer tissue sections. Here we describe an automated immunohistochemistry staining procedure that can be applied for the validation of multiple anti-PD-L1 antibody clones when used for the staining of formalin-fixed, paraffin-embedded lung cancer tissue sections.
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Acknowledgments
The authors would like to acknowledge the people that work in the Translational Molecular Pathology Immunoprofiling Laboratory, Luisa Solís, Mei Jang, Tong Li, Auriole Tamegnon, Barbara Mino, Wei Lu, and Jianling Zhou and the pathologists team that works in the image analysis, for their dedication to provide high quality data.
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Parra, E.R., Hernández Ruiz, S. (2021). Detection of Programmed Cell Death Ligand 1 Expression in Lung Cancer Clinical Samples by an Automated Immunohistochemistry System. In: Santiago-Cardona, P.G. (eds) Lung Cancer. Methods in Molecular Biology, vol 2279. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-1278-1_4
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DOI: https://doi.org/10.1007/978-1-0716-1278-1_4
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