Patients and disease characteristics.
| Characteristics | No.(%) |
|---|---|
| Age, years | |
| < 50 | 308 (57) |
| ≥ 50 | 232 (43) |
| Tumor size (pT) | |
| 1a | 5 (1) |
| 1b | 35 (6) |
| 1c | 142 (26) |
| 2 | 358 (67) |
| Tumor location | |
| Medial | 123 (23) |
| Central | 125 (23) |
| Lateral | 292 (54) |
| Histology | |
| Ductal | 434 (81) |
| Lobular | 3 (0) |
| Other | 103 (19) |
| Histological grade | |
| Grade I | 240 (44) |
| Grade II | 53 (10) |
| Grade III | 247 (46) |
| Number of positive axillary nodes | |
| None | 348 (64) |
| 1-3 nodes | 192 (36) |
| Positive nodes (%) | |
| ≤ 20% | 533 (99) |
| > 20% | 7 (1) |
| Estrogen receptor status | |
| Positive | 203 (38) |
| Negative | 183 (34) |
| Unknown | 154 (28) |
| Progesterone receptor status | |
| Positive | 196 (36) |
| Negative | 200 (37) |
| Unknown | 144 (27) |
| Preoperation chemotherapy | |
| Yes | 119 (22) |
| No | 421 (78) |
| Postoperation chemotherapy | |
| Yes | 504 (93) |
| No | 36 (7) |
| Cycles of postoperation chemotherapy | |
| ≤ 4 | 365 (72) |
| > 4 | 139 (28) |
| Radiotherapy | |
| Yes | 275 (51) |
| No | 265 (49) |
| Hormonal therapy | |
| Yes | 235 (44) |
| No | 305 (56) |