Abstract
Circulating tumour cells (CTCs) in breast cancer offer a unique opportunity to sample tissue that can derive from multiple sites in the body and may be more representative of the whole disease than a single standard biopsy. Their presence is now clearly associated with worse prognosis and can indicate treatment failure. Improved techniques to isolate single CTCs have also permitted in-depth molecular studies, revealing marked heterogeneity. Whilst giving a novel window into tumour evolution and resistance, it also raises new questions regarding treatment approaches. The ongoing challenge remains the translation of new information gleaned from CTCs into clinical benefit.
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