Diagnostic Tests
Liquid Biopsy
Also known as: ctDNA testing, Cell-free DNA testing, Blood-based biopsy
Definition
A blood test that detects circulating tumor DNA (ctDNA), circulating tumor cells (CTCs), or other cancer-derived material, offering a non-invasive way to analyze cancer.
Detailed Explanation
Liquid biopsies can detect cancer mutations, monitor treatment response, identify resistance mechanisms, and detect minimal residual disease. They're less invasive than tissue biopsies and can be repeated easily. FDA-approved tests include Guardant360 and FoundationOne Liquid.