Table 4. Effect of PMRT on survival.
| Characteristic | Without PMRT (5-year) | With PMRT (5-year) | P |
|---|---|---|---|
| Entire cohort | |||
| LRFS (%) | 88.9 | 98.7 | 0.005 |
| DMFS (%) | 80.6 | 86.1 | 0.494 |
| DFS (%) | 77.4 | 84.8 | 0.215 |
| OS (%) | 87.3 | 93.1 | 0.646 |
| Low-risk patients | |||
| LRFS (%) | 94.5 | 100 | 0.265 |
| DMFS (%) | 84.8 | 89.8 | 0.953 |
| DFS (%) | 83.5 | 89.8 | 0.898 |
| OS (%) | 90.0 | 87.5 | 0.328 |
| High-risk patients | |||
| LRFS (%) | 80.9 | 98.2 | 0.001 |
| DMFS (%) | 74.8 | 84.5 | 0.164 |
| DFS (%) | 68.8 | 82.7 | 0.027 |
| OS (%) | 83.6 | 90.4 | 0.444 |
PMRT, postmastectomy radiotherapy; LRFS, locoregional recurrence-free survival;
DMFS, distant metastasis-free survival; DFS, disease-free survival; OS, overall survival.