Table 1.
Clinicopathological characteristics of the 19 patients in the training data set
| Non-relapse | Relapse | p value | |
|---|---|---|---|
| Case number | 5 | 14 | |
| Age (mean ± SD) | 68.4 ± 10.7 | 61 ± 9.6 | 0.111 |
| Gender | |||
| Male | 3 | 14 | 0.012 |
| Female | 2 | 0 | |
| Tumor location | |||
| Upper/middle thoracic | 1 | 7 | 0.244 |
| Lower thoracic | 4 | 7 | |
| Histological grade | |||
| Well/moderate | 4 | 13 | 0.421 |
| Poorly | 1 | 1 | |
| Pathologic tumor depth | |||
| T1-2 | 3 | 3 | 0.111 |
| T3-4 | 2 | 11 | |
| Lymph node metastasis | |||
| N0 | 2 | 3 | 0.418 |
| N1-3 | 3 | 11 | |
| Distant metastasis | |||
| M0 | 5 | 14 | – |
| M1 | 0 | 0 | |
| TNM stage (IUAC TNM Classification 7th edition) | |||
| 1–2 | 3 | 4 | 0.211 |
| 3–4 | 2 | 10 | |
| Lymphatic vessel invasion | |||
| Negative | 2 | 3 | 0.418 |
| Positive | 3 | 11 | |
| Venous invasion | |||
| Negative | 3 | 4 | 0.211 |
| Positive | 2 | 10 | |
| Curability | |||
| R0 | 5 | 14 | – |
| R1 | 0 | 0 | |
| Preoperative chemotherapy | 0 | 2 | – |
| Preoperative chemo radiation therapy (CRT) | 0 | 1 | |
| Postoperative chemotherapy | 0 | 2 | – |
| Postoperative CRT | 1 | 5 | |
| Observation period (month, mean ± SD) | 138.7 ± 45.1 | 14 ± 9.2 | <0.001 |
| Duration between surgery and tumor relapse | – | 10 ± 8.4 | – |
| Type of tumor relapse | |||
| Liver (H) | 0 | 5 | |
| Lymph node (Ly) | 0 | 2 | |
| Local (L) | 0 | 1 | |
| H + Ly | 0 | 4 | |
| Ly + L | 0 | 2 | |