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BMC Cancer
Published in: BMC Cancer 1/2017

Open Access 01-12-2017 | Research article

Potential importance of protease activated receptor (PAR)-1 expression in the tumor stroma of non-small-cell lung cancer

Authors: Cong Lin, Christof J. Majoor, Joris J. T. H. Roelofs, Martijn D. de Kruif, Hugo M. Horlings, Keren Borensztajn, C. Arnold Spek

Published in: BMC Cancer | Issue 1/2017

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Abstract

Background

Protease activated receptor (PAR)-1 expression is increased in a variety of tumor cells. In preclinical models, tumor cell PAR-1 appeared to be involved in the regulation of lung tumor growth and metastasis; however the role of PAR-1 in the lung tumor microenvironment, which is emerging as a key compartment in driving cancer progression, remained to be explored.

Methods

In the present study, PAR-1 gene expression was determined in lung tissue from patients with non-small-cell lung cancer (NSCLC) using a combination of publicly available RNA microarray datasets and in house-made tissue microarrays including tumor biopsies of 94 patients with NSCLC (40 cases of adenocarcinoma, 42 cases of squamous cell carcinoma and 12 cases of other type of NSCLC at different stages).

Results

PAR-1 gene expression strongly correlated with tumor stromal markers (i.e. macrophage, endothelial cells and (myo) fibroblast markers) but not with epithelial cell markers. Immunohistochemical analysis confirmed the presence of PAR-1 in the tumor stroma and showed that PAR-1 expression was significantly upregulated in malignant tissue compared with normal lung tissue. The overexpression of PAR-1 in tumor stroma of NSCLC appeared to be independent from tumor type, tumor stage, histopathological differentiation status, disease progression and patient survival.

Conclusion

Overall, our data provide evidence that PAR-1 in NSCLC is mainly expressed on cells that constitute the pulmonary tumor microenvironment, including vascular endothelial cells, macrophages and stromal fibroblasts.
Appendix
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Metadata
Title
Potential importance of protease activated receptor (PAR)-1 expression in the tumor stroma of non-small-cell lung cancer
Authors
Cong Lin
Christof J. Majoor
Joris J. T. H. Roelofs
Martijn D. de Kruif
Hugo M. Horlings
Keren Borensztajn
C. Arnold Spek
Publication date
01-12-2017
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2017
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/s12885-017-3081-3

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