TABLE 1.
Population characteristics
| Characteristic | Value (%) |
|---|---|
| Tumor stage, n (%) | |
| T0 | 16 (0%) |
| T1 | 4379 (74%) |
| T2 | 1339 (23%) |
| T3 | 91 (2%) |
| TX | 35 (1%) |
| No. of positive nodes, n (%) | |
| 0 | 6737 (58%) |
| 1–3 | 3592 (31%) |
| ≥ 4 | 1267 (11%) |
| Nuclear grade, n (%) | |
| High | 3889 (38%) |
| Intermediate | 4717 (46%) |
| Low | 1598 (16%) |
| Histologic grade, n (%) | |
| High | 4411 (39%) |
| Intermediate | 5117 (46%) |
| Low | 1691 (15%) |
| LVI, n (%) | |
| No | 8104 (70%) |
| Yes | 3492 (30%) |
| Age, years | |
| ≤ 45 | 2270 (20%) |
| 45–65 | 6042 (52%) |
| ≥ 65 and up | 3284 (28%) |
LVI, lymphovascular invasion