Table 1.
Clinicopathologic characteristics of the patients
| Characteristic | No. (%) |
|---|---|
| Patients (n) | 879 (100) |
| Age (years): median (range) | 59.6 (24.2–92.1) |
| Tumor size (cm) | |
| <1 | 106 (12) |
| 1–2 | 461 (52) |
| 2–3 | 231 (26) |
| >3 | 74 (8) |
| Unknown | 7 (1) |
| Definitive nodal status | |
| N0 | 511 (58) |
| Nitc | 24 (3) |
| N1micro | 95 (11) |
| N1a | 158 (18) |
| N1b | 9 (1) |
| N1c | 20 (2) |
| N2a | 38 (4) |
| N3a | 17 (2) |
| N3b | 7 (1) |
| Bloom Richardson grade | |
| 1 | 368 (42) |
| 2 | 337 (38) |
| 3 | 164 (19) |
| Unknown | 10 (1) |
| Estrogen receptor status | |
| Positive | 759 (86) |
| Negative | 119 (14) |
| Unknown | 1 (0) |
| Progesterone receptor status | |
| Positive | 584 (66) |
| Negative | 293 (34) |
| Unknown | 2 (0) |
| HER2/neu status | |
| Positive | 75 (9) |
| Negative | 667 (76) |
| Unknowna | 137 (15) |
| Histopathologic type | |
| Ductal | 744 (85) |
| Lobular | 108 (12) |
| Tubular | 9 (1) |
| Other | 14 (2) |
| Unknown | 4 (0) |
aBefore 2004, HER2/neu status was not routinely analyzed