Relationship between postoperative ctDNA, postoperative CEA and recurrence status in all patients
| Recurrence | No recurrence | |
| Postoperative ctDNA positive, —n/total n (%) | ||
| Postoperative CEA elevated | 5/11 (45) | 1/8 (13) |
| Postoperative CEA not elevated | 6/11 (55) | 7/8 (87) |
| Postoperative ctDNA negative, n/total n (%) | ||
| Postoperative CEA elevated | 0/11 (0) | 1/124 (1) |
| Postoperative CEA not elevated | 11/11 (100) | 123/124 (99) |
Postoperative CEA data were not available in one case with recurrence and four cases without recurrence.
CEA, carcinoembryonic antigen; ctDNA, circulating tumour DNA.