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Erschienen in: Breast Cancer Research and Treatment 3/2010

01.12.2010 | Preclinical study

Cortactin gene amplification and expression in breast cancer: a chromogenic in situ hybridisation and immunohistochemical study

verfasst von: Konstantin J. Dedes, Maria-Angeles Lopez-Garcia, Felipe C. Geyer, Maryou B. K. Lambros, Kay Savage, Radost Vatcheva, Paul Wilkerson, Daniel Wetterskog, Magali Lacroix-Triki, Rachael Natrajan, Jorge S. Reis-Filho

Erschienen in: Breast Cancer Research and Treatment | Ausgabe 3/2010

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Abstract

Amplification of 11q13 is found in approximately 15% of breast cancers. Cyclin D1 (CCND1) has been reported to be the ‘driver’ of this amplicon, however, multiple genes map to the smallest region of amplification of 11q13. Out of these genes, cortactin (CTTN) has been shown to be consistently overexpressed at the mRNA level in tumours harbouring 11q13 amplification. The aims of this study are to define whether CTTN is consistently co-amplified with the main core of the 11q13 amplicon, whether it is consistently overexpressed when amplified and to determine correlations between CTTN amplification and overexpression with clinicopathological features of breast cancers and survival of breast cancer patients. CTTN and CCND1 chromogenic in situ hybridisation (CISH) probes and a validated monoclonal antibody against CTTN were applied to a tissue microarray of a cohort of breast cancers from patients treated with anthracycline-based chemotherapy. CTTN and CCND1 amplifications were found in 12.3 and 12.4% of cases, respectively. All cases harbouring CTTN amplification also displayed CCND1 amplification. High expression of CTTN was found in 10.8% of cases and was associated with CTTN amplification, expression of ‘basal’ markers and topoisomerase IIα. Exploratory subgroup analysis of tumours devoid of 11q13 amplification revealed that high expression of CTTN in the absence of CTTN gene amplification was associated with lymph node negative disease, lack of hormone receptors and FOXA1, expression of ‘basal’ markers, high Ki-67 indices, p53 nuclear expression, and basal-like and triple negative phenotypes. CTTN expression and CTTN gene amplification were not associated with disease-, metastasis-free and overall survival. In conclusion, CTTN is consistently co-amplified with CCND1 and expressed at higher levels in breast cancers harbouring 11q13 amplification, suggesting that CTTN may also constitute one of the drivers of this amplicon. CTTN expression is not associated with the outcome of breast cancer patients treated with anthracycline-based chemotherapy.
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Metadaten
Titel
Cortactin gene amplification and expression in breast cancer: a chromogenic in situ hybridisation and immunohistochemical study
verfasst von
Konstantin J. Dedes
Maria-Angeles Lopez-Garcia
Felipe C. Geyer
Maryou B. K. Lambros
Kay Savage
Radost Vatcheva
Paul Wilkerson
Daniel Wetterskog
Magali Lacroix-Triki
Rachael Natrajan
Jorge S. Reis-Filho
Publikationsdatum
01.12.2010
Verlag
Springer US
Erschienen in
Breast Cancer Research and Treatment / Ausgabe 3/2010
Print ISSN: 0167-6806
Elektronische ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-010-0816-0

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