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The Future of Liquid Biopsies: Detecting Disease with a Blood Sample Imagine detecting certain diseases from a simple blood draw instead of an invasive tissue biopsy. That's the promise of liquid biopsy—an evolving diagnostic approach that analyzes biomarkers such as circulating tumor DNA (ctDNA), circulating tumor cells (CTCs), cell-free DNA (cfDNA), RNA fragments, and extracellular vesicles found in the bloodstream. Unlike traditional biopsies, which capture information from a single loc …