Table 1.
Baseline tumor and patient characteristics.
| n (%) | P-value | ||
|---|---|---|---|
| aAge at diagnosis | ≤50 years | 355 (38) | <0.0001 |
| >50 years | 562 (61) | ||
| Tumor size | T1 | 223 (23) | <0.0001 |
| T2 | 642 (70) | ||
| T3 | 60 (7) | ||
| bNumber of nodes with tumor cells | 0 (N0) | 513 (55) | <0.0001 |
| 1-3 (N1) | 312 (34) | ||
| 4-9 (N2) | 99 (11) | ||
| Histological grade | Highly differentiated, G1 | 83 (9) | <0.0001 |
| Moderately differentiated, G2 | 472 (51) | ||
| Poorly differentiated, G3 | 370 (40) | ||
| ER/PR status | ER+/PR+ | 766 (83) | <0.0001 |
| ER+/PR- | 136 (15) | ||
| ER-/PR+ | 23 (2) | ||
| Treatment | Endocrine therapy alone | 196 (21) | <0.0001 |
| Chemoendocrine therapy | 729 (79) |
a
Age at diagnosis for 8 patients was unknown.
b
For one patient node-status was unknown.