clinical application of liquid biopsy in targeted therapy of metastatic colorectal cancer

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ID: 159271
2017
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Abstract
Background. Colorectal cancers (CRC) shed DNA into blood circulation. There is growing evidence that the analysis of circulating tumor DNA can be effectively used for monitoring of disease, to track tumor heterogeneity and to evaluate response to treatment. Case Presentation. Here, we describe two cases of patients with advanced CRC. The first case is about a patient with no available tissue for analysis of RAS mutation status. Liquid biopsy revealed RAS-wild-type and the therapy with anti-EGFR (epidermal growth factor receptor) monoclonal antibody cetuximab could be initiated. In the second case, the mutational profile of a patient with initial wild-type RAS-status was continually tracked during the course of treatment. An acquired KRAS exon 3 mutation was detected. The number of KRAS mutated fragments decreased continuously after the discontinuation of the therapy with EGFR-specific antibodies. Conclusion. Liquid biopsy provides a rapid genotype result, which accurately reproduces the current mutation status of tumor tissue. Furthermore, liquid biopsy enables close monitoring of the onset of secondary resistance to anti-EGFR therapy.
Reference Key
trojan2017caseclinical Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Jörg Trojan;Susanne Klein-Scory;Christine Koch;Wolff Schmiegel;Alexander Baraniskin
Journal aaps pharmscitech
Year 2017
DOI
10.1155/2017/6139634
URL
http://dx.doi.org/10.1155/2017/6139634
Keywords
neoplasms Oncology including cancer and carcinogens tumors

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