Application of Liquid Biopsies in Cancer Targeted Therapy

As a growing body of evidence demonstrates intertumoral and intratumoral heterogeneity and clonal evolution, both during carcinogenesis and also throughout treatment resulting in acquired drug resistance, the utility of blood-based assays or "liquid biopsies" is becoming increasingly recognized in clinical practice and trial design. "Liquid biopsies" provide a less invasive approach to the current gold standard of interrogating tumors by tissue biopsies, which are frequently unfeasible, associated with morbidity, and cannot be performed as often.