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Background  Basal-like and triple negative breast cancer (TNBC) share common molecular features, poor prognosis and a propensity for metastasis to the brain. Amplification of  epidermal growth factor receptor  ( EGFR ) occurs in ~50% of basal-like breast cancer, and mutations in the epidermal growth factor receptor ( EGFR ) have been reported in up to ~ 10% of Asian TNBC patients. In non-small cell lung cancer several different mutations in the EGFR tyrosine kinase domain confer sensitivity to receptor tyrosine kinase inhibitors, but the tumourigenic potential of EGFR mutations in breast cells and their potential for targeted therapy is unknown.    Materials and Methods  Constructs containing wild type, G719S or E746-A750 deletion mutant forms of  EGFR  were transfected into the MCF10A breast cells and their tumorigenic derivative, MCF10CA1a. The effects of EGFR over-expression and mutation on proliferation, migration, invasion, response to gefitinib, and tumour formation  in vivo  was investigated. Copy number analysis and whole exome sequencing of the MCF10A and MCF10CA1a cell lines were also performed.    Results  Mutant EGFR increased MCF10A and MCF10CA1a proliferation and MCF10A gefitinib sensitivity. The EGFR-E746-A750 deletion increased MCF10CA1a cell migration and invasion, and greatly increased MCF10CA1a xenograft tumour formation and growth. Compared to MCF10A cells, MCF10CA1a cells exhibited large regions of gain on chromosomes 3 and 9, deletion on chromosome 7, and mutations in many genes implicated in cancer.    Conclusions  Mutant EGFR enhances the oncogenic properties of MCF10A cell line, and increases sensitivity to gefitinib. Although the addition of EGFR E746-A750 renders the MCF10CA1a cells more tumourigenic  in vivo  it is not accompanied by increased gefitinib sensitivity, perhaps due to additional mutations, including the  PIK3CA  H1047R mutation, that the MCF10CA1a cell line has acquired. Screening TNBC/basal-like breast cancer for  EGFR  mutations may prove useful for directing therapy but, as in non-small cell lung cancer, accompanying mutations in  PIK3CA  may confer gefitinib resistance.

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Using the MCF10A/MCF10CA1a Breast Cancer Progression Cell Line Model to Investigate the Effect of Active, Mutant Forms of EGFR in Breast Cancer Development and Treatment Using Gefitinib