Cancer therapy. Ex vivo culture of circulating breast tumor cells for individualized testing of drug susceptibility

Science (Impact Factor: 33.61). 07/2014; 345(6193). DOI: 10.1126/science.1253533


Circulating tumor cells (CTCs) are present at low concentrations in the peripheral blood of patients with solid tumors. It
has been proposed that the isolation, ex vivo culture, and characterization of CTCs may provide an opportunity to noninvasively
monitor the changing patterns of drug susceptibility in individual patients as their tumors acquire new mutations. In a proof-of-concept
study, we established CTC cultures from six patients with estrogen receptor–positive breast cancer. Three of five CTC lines
tested were tumorigenic in mice. Genome sequencing of the CTC lines revealed preexisting mutations in the PIK3CA gene and newly acquired mutations in the estrogen receptor gene (ESR1), PIK3CA gene, and fibroblast growth factor receptor gene (FGFR2), among others. Drug sensitivity testing of CTC lines with multiple mutations revealed potential new therapeutic targets.
With optimization of CTC culture conditions, this strategy may help identify the best therapies for individual cancer patients
over the course of their disease.

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Available from: Nicola Aceto, Jul 23, 2014

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