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Liquid biopsy. A distance to the tumor in the brain body fluids can be taken at low risk to reveal genetic information from the tumor to guide clinical treatment. CSF—cerebrospinal fluid; CTC—circulating tumor cell; EV—extracellular vesicle. Adapted with permission from [24,46]. Created/modified with SMART [63], licensed by a Creative Commons Attribution 3.0 Unported License [64].
