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. 2020 Jan 23;13:719–731. doi: 10.2147/OTT.S229562

Figure 1.

Figure 1

Schematic showing the source of CSF-ctDNA and CTCs from primary and metastatic CNS tumors. CSF serve as a “liquid biopsy” of CNS malignancies for evaluating ctDNA to characterize tumor-specific mutations.