Cancer Cell
Volume 31, Issue 2, 13 February 2017, Pages 172-179
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Perspective
Liquid Biopsies, What We Do Not Know (Yet)

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The inherent molecular heterogeneity of metastatic tumors and the ability of cancer genomes to dynamically evolve are not properly captured by tissue specimens. Analysis of cell-free DNA and circulating tumor cells has the potential to change clinical practice by exploiting blood rather than tissue as a source of information. Liquid biopsies are already used to monitor disease response and track the emergence of drug resistance. The suitability of blood-based molecular profiles for early detection and monitoring minimal residual disease is being evaluated. In this review, we address open questions in this fast-evolving field of research.

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