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Liquid biopsies are not as sensitive as IHC or FISH for testing NTRK gene fusions [1]. If circulating DNA and RNA volume is low (e.g. when the tumour volume is low), a test failure or false negative may result. Finally, it is currently not available for routine clinical use as further development is required [2].


  1. Hofman P. Liquid Biopsy and Therapeutic Targets: Present and Future Issues in Thoracic Oncology. Cancers (Basel) 2017; 9: pii: E154. doi: 110.3390/cancers9110154.
  2. Merker JD, Oxnard GR, Compton C et al. Circulating Tumor DNA Analysis in Patients With Cancer: American Society of Clinical Oncology and College of American Pathologists Joint Review. J Clin Oncol 2018; 36: 1631-1641.

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