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Transl Oncol. 2016 Feb;9(1):64-69. doi: 10.1016/j.tranon.2016.01.003.

PD-L1 Expression and Survival among Patients with Advanced Non-Small Cell Lung Cancer Treated with Chemotherapy.

Translational oncology

Steffen Filskov Sorensen, Wei Zhou, Marisa Dolled-Filhart, Jeanette Baehr Georgsen, Zhen Wang, Kenneth Emancipator, Dianna Wu, Michael Busch-Sørensen, Peter Meldgaard, Henrik Hager

Affiliations

  1. Department of Oncology, Aarhus University Hospital, Norrebrogade 44, DK-8000 Aarhus C, Denmark. Electronic address: [email protected].
  2. Merck & Co., Inc., 2000 Galloping Hill Rd, Kenilworth, NJ, USA. Electronic address: [email protected].
  3. Merck & Co., Inc., 2000 Galloping Hill Rd, Kenilworth, NJ, USA. Electronic address: [email protected].
  4. Department of Pathology, Aarhus University Hospital, Norrebrogade 44, DK-8000 Aarhus C, Denmark. Electronic address: [email protected].
  5. MSD China, 20/F Park Place, 1601 Nanjing Road West, Jin'an District, Shanghai 20040, China. Electronic address: [email protected].
  6. Merck & Co., Inc., 2000 Galloping Hill Rd, Kenilworth, NJ, USA. Electronic address: [email protected].
  7. Formerly of Merck & Co., Inc., 2000 Galloping Hill Rd, Kenilworth, NJ, USA. Electronic address: [email protected].
  8. MSD Denmark, Lautrupbjerg 4, 2750 Ballerup, Denmark. Electronic address: [email protected].
  9. Department of Oncology, Aarhus University Hospital, Norrebrogade 44, DK-8000 Aarhus C, Denmark. Electronic address: [email protected].
  10. Department of Pathology, Aarhus University Hospital, Norrebrogade 44, DK-8000 Aarhus C, Denmark. Electronic address: [email protected].

PMID: 26947883 PMCID: PMC4800057 DOI: 10.1016/j.tranon.2016.01.003

Abstract

BACKGROUND: Recent clinical trial results have suggested that programmed cell death ligand 1 (PD-L1) expression measured by immunohistochemistry may predict response to anti-programmed cell death 1 (PD-1) therapy. Results on the association between PD-L1 expression and survival among patients with advanced non-small cell lung cancer (NSCLC) treated with chemotherapy are inconsistent.

MATERIAL AND METHODS: We evaluated the relationship between PD-L1 expression and overall survival (OS) among 204 patients with advanced NSCLC treated at Aarhus University Hospital, Aarhus, Denmark, from 2007 to 2012. PD-L1 expression was measured using a prototype immunohistochemistry assay with the anti-PD-L1 22C3 antibody (Merck). PD-L1 strong positivity and weak positivity were defined to be traceable to the clinical trial version of the assay.

RESULTS: Twenty-five percent of patients had PD-L1 strong-positive tumors, and 50% had PD-L1 weak-positive tumors. No statistically significant association was found between PD-L1 expression and survival; adjusted hazard ratio of 1.34 (95% confidence interval, 0.88-2.03; median OS, 9.0 months) for the PD-L1 strong-positive group and 1.07 (0.74-1.55; median OS, 9.8 months) for the PD-L1 weak-positive group compared with the PD-L1-negative group (median OS, 7.5 months). No association was seen between PD-L1 expression and OS when PD-L1 expression levels were stratified by median or tertiles.

CONCLUSIONS: In concordance with previous studies, we found PD-L1 measured by immunohistochemistry to be frequently expressed in patients with advanced NSCLC. However, PD-L1 expression is not a strong prognostic marker in patients with advanced NSCLC treated with chemotherapy.

Copyright © 2016 The Authors. Published by Elsevier Inc. All rights reserved.

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