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Published in: Journal of Translational Medicine 1/2017

Open Access 01-12-2017 | Research

Association of osteopontin with specific prognostic factors and survival in adjuvant breast cancer trials of the Hellenic Cooperative Oncology Group

Authors: Amanda Psyrri, Konstantine T. Kalogeras, Ralph M. Wirtz, George Kouvatseas, Georgia Karayannopoulou, Anna Goussia, Flora Zagouri, Elke Veltrup, Eleni Timotheadou, Helen Gogas, Angelos Koutras, Georgios Lazaridis, Christos Christodoulou, George Pentheroudakis, Panagiota Economopoulou, Apostolos Laskarakis, Petroula Arapantoni-Dadioti, Anna Batistatou, Maria Sotiropoulou, Gerasimos Aravantinos, Pavlos Papakostas, Paris Kosmidis, Dimitrios Pectasides, George Fountzilas

Published in: Journal of Translational Medicine | Issue 1/2017

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Abstract

Background

The shift towards an earlier diagnosis of breast cancer (BC) highlights the need for biomarkers that would identify patients at risk for relapse and metastatic spread and indicate the potential value of additional treatment strategies. Osteopontin (OPN) is a matricellular protein that has been suggested to be a potential biomarker in BC. In the present study, we used archived BC patient samples to assess the clinical utility of OPN.

Methods

Formalin-fixed paraffin-embedded tumor tissue samples from 975 patients were collected from two large phase III randomized adjuvant chemotherapy trials (HE10/97 and HE10/00) that included patients with high risk BC. All tissue samples were assessed for ER, PgR, Ki67 and HER2 protein expression. OPN protein and mRNA expression was evaluated using immunohistochemistry and quantitative reverse transcription-polymerase chain reaction, respectively.

Results

OPN mRNA expression data were available for 814 patients, whereas OPN protein expression data were available for 546 patients. The majority of patients were ER/PgR-positive (78.3%), HER2-negative (76.5%) and Ki67-positive (55.2%) and had received adjuvant radiation therapy (76.8%) and hormonal therapy (81.1%). OPN mRNA expression was significantly associated with age (60.9% in high OPN tumors vs. 54.1% in low OPN tumors, p = 0.047), ER/PgR-negative status (25.7 vs. 17.2%, p = 0.004) and BC subtypes (p = 0.021). In addition, high OPN mRNA expression was significantly associated with reduced DFS (HR 1.26, 95% CI 1.00–1.59, Wald’s p = 0.050) and OS (HR 1.37, 95% CI 1.05–1.78, p = 0.019), while it retained its prognostic significance for both DFS (HR 1.39, 95% CI 1.10–1.77, p = 0.007) and OS (HR 1.54, 95% CI 1.61–2.05, p = 0.003) in the multivariate analysis.

Conclusions

We showed that high OPN mRNA expression is associated with decreased DFS and OS in a large cohort of BC patients treated with adjuvant chemotherapy in a clinical trial setting. Our results suggest that OPN may serve as a prognostic factor and a potential target for therapy.
Trial registration Australian New Zealand Clinical Trials Registry; HE10/97 ACTRN12611000506998; HE10/00 ACTRN12609001036202
Appendix
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Metadata
Title
Association of osteopontin with specific prognostic factors and survival in adjuvant breast cancer trials of the Hellenic Cooperative Oncology Group
Authors
Amanda Psyrri
Konstantine T. Kalogeras
Ralph M. Wirtz
George Kouvatseas
Georgia Karayannopoulou
Anna Goussia
Flora Zagouri
Elke Veltrup
Eleni Timotheadou
Helen Gogas
Angelos Koutras
Georgios Lazaridis
Christos Christodoulou
George Pentheroudakis
Panagiota Economopoulou
Apostolos Laskarakis
Petroula Arapantoni-Dadioti
Anna Batistatou
Maria Sotiropoulou
Gerasimos Aravantinos
Pavlos Papakostas
Paris Kosmidis
Dimitrios Pectasides
George Fountzilas
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Journal of Translational Medicine / Issue 1/2017
Electronic ISSN: 1479-5876
DOI
https://doi.org/10.1186/s12967-017-1134-7

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