PD-L1 expression in NSCLC: Role of cell blocks and concordance between samples

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  • Andrea Ambrosini-Spaltro, Morgagni-Pierantoni Hospital
  • ,
  • Alessandra Dubini, Morgagni-Pierantoni Hospital
  • ,
  • Federica Pieri, Morgagni-Pierantoni Hospital
  • ,
  • Claudia Ravaglia, Morgagni-Pierantoni Hospital
  • ,
  • Angelo Delmonte, IRCCS Istituto scientifico romagnolo per lo studio e la cura dei tumori - Meldola (FC)
  • ,
  • Venerino Poletti, Morgagni-Pierantoni Hospital

Background: PD-L1 immunohistochemistry is currently performed in patients with advanced non-small cell lung carcinoma (NSCLC) to identify responders to immune checkpoint inhibitors. Cell blocks from fine needle aspiration of NSCLC are frequently used for diagnostic purposes. The aims of the study are to analyze: (a) the distribution of PD-L1 in cell blocks, in comparison to biopsies and surgical specimens; (b) the concordance of PD-L1 in specimens of the same patients. Methods: PD-L1 analyses conducted in NSCLCs were retrieved. Cell blocks were prepared with the self-clotting method. PD-L1 was performed with Dako 22C3 on the Ventana BenchMark ULTRA platform. Results were divided by tumor proportion score (TPS) in 3 categories: <1%; 1% to 49%; ≥50%. Results: A total of 483 samples from 456 patients was collected: 120 cell blocks (24.8%), 307 endoscopic or transthoracic biopsies (63.6%), 56 surgical specimens (11.6%). TPS was: <1% in 230 samples (47.8%), 1% to -49% in 136 (28.3%) and ≥ 50% in 115 (23.9%); in two samples material was insufficient. Statistics did not reveal significant differences in PD-L1 expression among the various materials (χ2 = 2.905; P =.574). In 50 samples from 25 patients, PD-L1 was carried out in two samples of the same patients, with moderate agreement (concordance rate: 68.0%, k = 0.469). Conclusion: (a) PD-L1 is similarly distributed in the different materials; (b) PD-L1 shows moderate concordance in different samples of the same patients. PD-L1 may be routinely tested in cell blocks, but interpreted with caution and repeated whenever possible.

TidsskriftDiagnostic Cytopathology
Sider (fra-til)303-310
Antal sider8
StatusUdgivet - feb. 2021

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