Univariate analysis of recurrence-free proportion of patients stratified by T classification and IVI status
| Group | T classification | IVI status | Patients (%) | Recurrence-free proportion at 5 years (%) | p Value by log rank test | ||
| A | T1a | (−) | 425 (19) | 93.1 | vs | Group C | 0.244 |
| Group E | <0.001* | ||||||
| C | T1b | (−) | 312 (14) | 89.7 | vs | Group E | <0.001* |
| E | T2a | (−) | 302 (13) | 78.4 | vs | Group G | 0.224 |
| Group B | 0.018* | ||||||
| Group D | <0.001* | ||||||
| G | T2b | (−) | 37 (16) | 70.5 | vs | Group B | 0.751 |
| vs | Group D | 0.485 | |||||
| vs | Group I | 0.071 | |||||
| B | T1a | (+) | 90 (4) | 69.3 | vs | Group D | 0.578 |
| vs | Group I | 0.047* | |||||
| D | T1b | (+) | 136 (6) | 62.7 | vs | Group I | 0.08 |
| vs | Group F | 0.052 | |||||
| I | T3 | (−) | 75 (3) | 53.1 | vs | Group F | 0.64 |
| vs | Group H | 0.449 | |||||
| vs | Group J | 0.031* | |||||
| F | T2a | (+) | 523 (23) | 53 | vs | Group H | 0.093 |
| H | T2b | (+) | 121 (5) | 46.4 | vs | Group J | 0.069 |
| vs | Group K | 0.072 | |||||
| J | T3 | (+) | 261 (11) | 37.4 | vs | Group K | 0.215 |
| K | T4 | 13 (6) | 34.2 | ||||
↵* Indicates significance.
IVI, intratumoral vascular invasion.