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Breast cancer is the most common female malignancy in the world,with 1.7 million new diagnoses in 2012 according to the International Agency for Research on Cancers(IARC),online database,GLOBOCAN 20121.Breast tumor kinase(BRK),also known as protein tyrosine kinase 6(PTK6),is overexpressed in up to 86%of invasive breast cancers2.