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Published in: Cancer Immunology, Immunotherapy 3/2018

01-03-2018 | Original Article

Characterization of PD-L1 expression in Chinese non-small cell lung cancer patients with PTEN expression as a means for tissue quality screening

Authors: Xu-chao Zhang, Xu Cao, Chun Sun, Zhi Xie, Jian-jun Guo, Jin-ji Yang, Xue-ning Yang, Hang-jun Dai, Su-chun Li, Xin-ran Xu, Yun-xia Zuo, Meng Chen, Hartmut Koeppen, Jing He, Astrid Kiermaier, David Shames, Gang Cheng, Yi-long Wu

Published in: Cancer Immunology, Immunotherapy | Issue 3/2018

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Abstract

The goal of this study is to evaluate PD-L1 prevalence and its association with major clinical characteristics in Chinese non-small cell lung cancer (NSCLC) patients to inform the clinical development of anti-PD1/PD-L1 agents in this population. We used phosphatase and tensin homolog (PTEN) expression through IHC as a surrogate tissue quality marker to screen surgical NSCLC samples in tissue microarray (TMA; 172 cases) or whole-section (268 cases) format. The samples were then analyzed with a clinically validated PD-L1 IHC assay. The results were correlated with baseline characteristics and clinical outcomes. PTEN IHC showed that 108 TMA samples and 105 whole-section samples qualified for PD-L1 IHC. With a clinically relevant cutoff, 41.7% of the TMA samples were PD-L1 positive. PD-L1 level was much lower in EGFR-mutant patients and seemed to be a favorable prognostic factor for both overall survival (OS) and recurrence-free survival (RFS). These findings were confirmed in the whole-section samples except that their survival data were not mature enough for correlation analysis. In summary, PD-L1 expression was detected in approximately 40% of PTEN-qualified Chinese NSCLC samples, negatively correlated with EGFR mutation and seemed to be a favorable prognostic factor for both OS and RFS. Notably, the different results from PTEN-qualified and PTEN-disqualified samples underscore the importance of tissue quality control prior to biomarker testing.
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Metadata
Title
Characterization of PD-L1 expression in Chinese non-small cell lung cancer patients with PTEN expression as a means for tissue quality screening
Authors
Xu-chao Zhang
Xu Cao
Chun Sun
Zhi Xie
Jian-jun Guo
Jin-ji Yang
Xue-ning Yang
Hang-jun Dai
Su-chun Li
Xin-ran Xu
Yun-xia Zuo
Meng Chen
Hartmut Koeppen
Jing He
Astrid Kiermaier
David Shames
Gang Cheng
Yi-long Wu
Publication date
01-03-2018
Publisher
Springer Berlin Heidelberg
Published in
Cancer Immunology, Immunotherapy / Issue 3/2018
Print ISSN: 0340-7004
Electronic ISSN: 1432-0851
DOI
https://doi.org/10.1007/s00262-017-2098-4

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