Table I.
Characteristics of 4,652 patients with primary breast cancer.
| Characteristic | Number of patients, n (%) |
|---|---|
| Menopausal status | |
| Premenopausal | 1,614 (34.7) |
| Postmenopausal | 3,026 (65.0) |
| Male | 12 (0.3) |
| Tumor size | |
| T1 | 3,286 (70.6) |
| T2 | 1,205 (25.9) |
| T3, 4 | 120 (2.6) |
| Unknown | 41 (0.9) |
| Number of involved nodes | |
| 0 | 3,242 (69.7) |
| 1-3 | 1,062 (22.8) |
| ≥4 | 338 (7.3) |
| Unknown | 10 (0.2) |
| Estrogen receptor | |
| Negative | 888 (19.1) |
| Positive | 3,764 (80.9) |
| Progesterone receptor | |
| Negative | 1,299 (27.9) |
| Positive | 3,353 (72.1) |
| HER2 | |
| Negative | 4,030 (86.6) |
| Positive | 622 (13.4) |
| p53-overexpression | |
| Without | 3,769 (81.0) |
| With | 701 (15.1) |
| Unknown | 182 (3.9) |
| Ki-67 | |
| ≤20% | 1,887 (40.6) |
| 21–49% | 2,022 (43.4) |
| ≥50% | 743 (16.0) |
| Grade | |
| 1 | 2,466 (53.0) |
| 2 | 1,078 (23.2) |
| 3 | 1,108 (23.8) |
| Total | 4,652 |
HER2, receptor tyrosine-protein kinase erbB-2.