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O the data made available in this article, unless otherwise stated.Luey and May Molecular Cancer (2016) 15:Page 2 ofBackground Worldwide, more than 1.7 million women are diagnosed annually with breast cancer of whom at least 500,000 die as a result of metastatic disease [1]. Metastasis necessitates release of malignant cells from the primary tumour and their movement to and establishment at distan