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Comparison of circulating tumor DNA and standard detection methods
| Number of recurrences | ctDNA | Imaging methods | CA19-9 and/or CEA markers |
| 13 | + | + | + |
| 3 | + | + | - |
| 2 | + | - | + |
| 4 | + | - | - |
Plus and minus symbols indicate positive and negative results of screening for recurrence, respectively. CA 19-9: Carbohydrate antigen 19-9; CEA: Carcinoembryonic antigen; ctDNA: Circulating tumor DNA.
