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Published in: Breast Cancer Research and Treatment 1/2014

Open Access 01-05-2014 | Preclinical study

HER2/HER3 heterodimers and p21 expression are capable of predicting adjuvant trastuzumab response in HER2+ breast cancer

Authors: Andrew R. Green, Fabrício F. T. Barros, Tarek M. A. Abdel-Fatah, Paul Moseley, Christopher C. Nolan, Alice C. Durham, Emad A. Rakha, Stephen Chan, Ian O. Ellis

Published in: Breast Cancer Research and Treatment | Issue 1/2014

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Abstract

Human epidermal growth factor receptor 2 (HER2) plays an important role in breast cancer progression and provides predictive information for response to targeted therapy including trastuzumab although this is limited. Downstream pathways, such as PI3K/Akt, are associated with HER2/HER3 heterodimerization promoting survival and proliferation amongst cancer cells. Thus, patient outcome and trastuzumab therapy effectiveness might be further characterised by HER2/HER3 dimerisation and its signalling pathways. HER2/HER3 dimerisation status was assessed, using chromogenic in situ Proximity Ligation Assay, in two breast cancer series: early stage primary breast cancer, including 224 HER2+ patients that were not submitted to trastuzumab, and HER2+ breast cancer where patients were treated with adjuvant trastuzumab (n = 143). Levels of biomarkers including PI3K, pAKT, ER, PgR, HER3, BCL2, p53, PTEN and p21 were measured using immunohistochemistry. Levels of HER2/HER3 heterodimers were compared with biomarker expression and patient outcome. An association between high levels of HER2/HER3 dimerisation and absence of hormone receptors, ER and PgR, was observed. We further show for the first time the presence of HER2/HER3 heterodimers and the loss of p21 expression in HER2+ breast cancer predicts a significantly poorer outcome when submitted to adjuvant trastuzumab. Breast cancer patients that reveal high levels of HER2/HER3 dimerisation and loss of p21 are associated with poor survival prognosis in patients with HER2+ breast cancer treated with adjuvant trastuzumab. Further quantification analysis of HER dimer/ligand complexes and downstream signalling pathways will begin to unravel the complex associations with patient outcome and its relationship with sensitivity to targeted treatment.
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Metadata
Title
HER2/HER3 heterodimers and p21 expression are capable of predicting adjuvant trastuzumab response in HER2+ breast cancer
Authors
Andrew R. Green
Fabrício F. T. Barros
Tarek M. A. Abdel-Fatah
Paul Moseley
Christopher C. Nolan
Alice C. Durham
Emad A. Rakha
Stephen Chan
Ian O. Ellis
Publication date
01-05-2014
Publisher
Springer US
Published in
Breast Cancer Research and Treatment / Issue 1/2014
Print ISSN: 0167-6806
Electronic ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-014-2925-7

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