Interlaboratory concordance of PD-L1 immunohistochemistry for non-small-cell lung cancer

Andreas H. Scheel, Gudrun Baenfer, Gustavo Baretton, Manfred Dietel, Rolf Diezko, Thomas Henkel, Lukas C. Heukamp, Bharat Jasani, Korinna Jöhrens, Thomas Kirchner, Felix Lasitschka, Iver Petersen, Simone Reu, Hans Ulrich Schildhaus, Peter Schirmacher, Kristina Schwamborn, Ulrich Sommer, Oliver Stoss, Markus Tiemann, Arne WarthWilko Weichert, Jürgen Wolf, Reinhard Büttner, Josef Rüschoff

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40 Citations (Scopus)

Abstract

Aims: Programmed death ligand 1 (PD-L1) immunohistochemistry has become a mandatory diagnostic test in the treatment of lung cancer. Several research initiatives have started to harmonise the five PD-L1 immunohistochemistry assays that have been used in clinical trials. Here, we report data on interlaboratory and interassay concordance for commercial assays (‘assays’) and laboratory-developed tests (LDTs) at 10 German testing sites. Methods and results: To assess interlaboratory concordance, a tissue microarray containing 21 pulmonary carcinoma specimens was centrally prepared. Pre-cut sections were stained at 10 sites by the use of assays 28-8, 22C3, SP263, and SP142, as well as 11 LDTs. Assay performance was evaluated with a second tissue microarray containing 11 cell lines with defined PD-L1 expression. Quality control was centrally performed by manual and digital analyses. The assays yielded reproducible IHC staining patterns at all sites. In agreement with previous studies, 22C3, 28-8 and SP263 showed similar staining patterns, whereas SP142 was distinct. Among the LDTs, six of 11 protocols showed staining patterns similar to those of assays 22C3 and 28-8. Interlaboratory concordance of tumour cell scoring by use of a six-step system was moderate (Light's κ = 0.43–0.69), whereas the clinically approved cut-offs of ≥1% and ≥50% showed substantial concordance (κ = 0.73–0.89). Immune cell scoring by the use of SP142 yielded moderate concordance (κ = 0.42). Conclusions: The data confirm the previously described staining patterns of the assays, and show that they can be reproducibly employed at different sites. LDTs with staining results similar to those of the assays are implementable, but have to be carefully validated.

Original languageEnglish
Pages (from-to)449-459
Number of pages11
JournalHistopathology
Volume72
Issue number3
DOIs
Publication statusPublished - Feb 1 2018

Keywords

  • CD274 antigens
  • immunohistochemistry
  • immunotherapy
  • non-small-cell lung carcinoma

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Histology

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