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Association of ctDNA status with clinicopathological characteristics.
| Total, N | ctDNA-negative, n (%) | ctDNA-positive, n (%) | Statistics | |
|---|---|---|---|---|
| Time points | ||||
| Preoperative | 36 | 18 (50) | 18 (50) | Not applicable |
| Postoperative | 45 | 33 (73) | 12 (27) | |
| Clinical stage | ||||
| Low (I, II) | 25 | 12 (48) | 13 (52) | |
| High (III, IV) | 6 | 3 (50) | 3 (50) | P = .93 |
| Grade | ||||
| Low (II) | 11 | 8 (73) | 3 (27) | |
| High (III, IV) | 25 | 10 (40) | 15 (60) | P = .07 |
| Average tumor size, cm (range) | ||||
| 8 (2.9-17) | 6.9 (2.9-12) | 9.3 (4-17) | P = .043 | |
