PD-L1 testing of non-small cell lung cancer using different antibodies and platforms: a Swiss cross-validation study.

Savic Prince, Spasenija; Berezowska, Sabina Anna; Eppenberger-Castori, Serenella; Cathomas, Gieri; Diebold, Joachim; Fleischmann, Achim; Jochum, Wolfram; Komminoth, Paul; McKee, Thomas; Letovanec, Igor; Jasarevic, Zerina; Rössle, Matthias; Singer, Gad; von Gunten, Michael; Zettl, Andreas; Zweifel, Roland; Soltermann, Alex; Bubendorf, Lukas (2019). PD-L1 testing of non-small cell lung cancer using different antibodies and platforms: a Swiss cross-validation study. Virchows Archiv, 475(1), pp. 67-76. Springer 10.1007/s00428-019-02582-0

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With the approval of pembrolizumab for first- and second-line treatment of PD-L1+ non-small cell lung cancer (NSCLC), PD-L1 testing by immunohistochemistry (IHC) has become a necessity. However, the DAKO autostainer ASL48 for the FDA approved DAKO 22C3 pharmDx assay is not broadly available in Switzerland and other parts of Europe. The primary goal of this study was to cross-validate the 22C3 anti-PD-L1 antibody on Benchmark Ultra (VBMU) and Leica Bond (LBO) immunostainers. IHC protocols were developed for 22C3 on both platforms with the 22C3phDx using ASL48 as reference. A tissue microarray (TMA) was constructed from 23 NSCLC specimens with a range of PD-L1 staining results. Empty TMA sections and the 22C3 antibody were distributed to 16 participants for staining on VBMU (8 centers) and/or LBO (12 centers) using the centrally developed protocols. Additionally the performance of the Ventana SP263 assay was tested in five centers. IHC scoring was performed centrally. Categorical PD-L1 staining (0-49% vs. 50-100%) did not significantly differ between centers using VBMU, whereas data from LBO were highly variable (p < 0.001). The SP263 assay was well concordant with 22C3 on VBMU and with 22C3 pharmDx. PD-L1 IHC using a standardized 22C3 protocol on VBMU provides satisfactory results in most centers. The SP263 assay is confirmed as a valid alternative to 22C3 pharmDx. 22C3 PD-L1 IHC on LBO shows major staining variability between centers, highlighting the need for local validation and adjustment of protocols.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Service Sector > Institute of Pathology > Clinical Pathology
04 Faculty of Medicine > Service Sector > Institute of Pathology

UniBE Contributor:

Savic Prince, Spasenija; Berezowska, Sabina Anna; von Gunten, Michael and Bubendorf, Lukas

Subjects:

500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health

ISSN:

0945-6317

Publisher:

Springer

Language:

English

Submitter:

Sabina Anna Berezowska

Date Deposited:

20 Aug 2019 14:22

Last Modified:

24 Oct 2019 10:42

Publisher DOI:

10.1007/s00428-019-02582-0

PubMed ID:

31127385

Uncontrolled Keywords:

22C3 Immunohistochemistry Non-small cell lung carcinoma PD-L1 SP263

BORIS DOI:

10.7892/boris.132287

URI:

https://boris.unibe.ch/id/eprint/132287

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