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. Author manuscript; available in PMC: 2024 Mar 1.
Published in final edited form as: Clin Gastroenterol Hepatol. 2022 Dec 17;21(3):604–616. doi: 10.1016/j.cgh.2022.12.008

Figure 1.

Figure 1.

ctDNA-based assays are based on the detection of tumor cell-derived nucleic acids in the circulation. Next-generation sequencing is used to detect ctDNA fragments (with cancer-related mutations) and aberrantly methylated ctDNA.