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Multivariate analysis of clinical characteristics affecting OS.
| Clinical characteristics | HR (95% CI) | P-value |
|---|---|---|
| ECOG (0/1 vs. 2) | 0.691 (0.176–2.710) | 0.596 |
| N stage (negative vs. positive) | 0.466 (0.110–1.983) | 0.302 |
| ctDNA status in first post-radiation plasma (negative vs. positive) | 0.183 (0.049–0.678) | 0.011 |
OS, overall survival; HR, hazard ratio; ECOG, Eastern Cooperative Oncology Group; ct, circulating tumor.
