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Original Paper

A mouse model of basal‐like breast carcinoma with metaplastic elements*

A McCarthy

The Breakthrough Breast Cancer Research Centre, Institute of Cancer Research, London SW3 6JB, UK

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K Savage

The Breakthrough Breast Cancer Research Centre, Institute of Cancer Research, London SW3 6JB, UK

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A Gabriel

The Breakthrough Breast Cancer Research Centre, Institute of Cancer Research, London SW3 6JB, UK

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C Naceur

The Breakthrough Breast Cancer Research Centre, Institute of Cancer Research, London SW3 6JB, UK

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JS Reis‐Filho

The Breakthrough Breast Cancer Research Centre, Institute of Cancer Research, London SW3 6JB, UK

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A Ashworth

Corresponding Author

E-mail address:Alan.Ashworth@icr.ac.uk

The Breakthrough Breast Cancer Research Centre, Institute of Cancer Research, London SW3 6JB, UK

The Breakthrough Breast Cancer Research Centre, Institute of Cancer Research, London SW3 6JB, UK.
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First published: 09 January 2007
Cited by: 63
*

No conflicts of interest were declared.

Abstract

Breast cancers arising in carriers of germline BRCA1 mutations frequently have a basal‐like phenotype. Basal‐like cancers are characterized by high histological grade, central necrotic areas, foci with metaplastic differentiation, lack of hormone receptor and HER2 (ErbB2) expression, and consistent positivity for basal markers, including CK5/6, CK14, and EGFR. We have used germline manipulation to generate a conditional mouse model of Brca1 deficiency. Transgenic expression of Cre recombinase in the mammary gland of these mice results in deletion of exons encoding the C‐terminus of Brca1 and leads to tumour formation when combined with heterozygosity for a p53 mutation. Histologically, these mammary gland tumours were characterized by high histological grade, central necrotic areas, and presence of homologous metaplastic elements. These metaplastic elements consisted of neoplastic spindle cells or squamous cell differentiation in the form of keratin pearls or individual cell keratinization. Immunohistochemical analysis revealed expression of basal‐like markers in all cases. The tumour phenotype generated in our mouse model was compared with published data on human basal‐like breast carcinomas and also with metaplastic breast cancers with a basal‐like phenotype; the comparison showed that we have generated a mouse model of basal‐like breast cancer, which should prove useful in testing new and targeted treatments for this type of breast cancer. Copyright © 2007 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.

Number of times cited: 63

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