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Implementation of PD-L1 22C3 IHC pharmDxTM in Cell Block Preparations of Lung Cancer: Concordance with Surgical Resections and Technical Validation of CytoLyt® Prefixation

In patients with advanced stage lung disease, it is beneficial to evaluate candidacy for immunotherapy without invasive biopsy testing. Lou et al performed a concordance study to evaluate formalin fixed cell blocks compared to lung tumor resections using a PD-L1 22C3 IHC pharmDx™ assay and found strong concordance between pathologists and HALO image analysis software. Future research will focus on clinical validation by assessing the clinical benefit from immunotherapy following PD-L1 immunohistochemistry on cytology specimens.

Lou SK, Ko HM, Kinoshita T, MacDonald S, Weiss J, Czarnecka-Kujawa K, Boerner SL, Yasufuku K, Tsao M-S, Schwock J

Acta Cytologica | First published December 2020 | DOI https://doi.org/10.1159/000508628