Table 1. Patient characteristics.
| Characteristic | No. (%) |
|---|---|
| Age at diagnosis (yr)* | 48 (20–89) |
| Menopause | |
| Premenopause | 138 (60.3) |
| Postmenopause | 91 (39.7) |
| Initial T stage† | |
| T1 | 91 (39.1) |
| T2 | 110 (47.2) |
| T3 | 24 (10.3) |
| T4 | 8 (3.4) |
| Initial N stage† | |
| N0 | 147 (63.1) |
| N1 | 52 (22.3) |
| N2 | 16 (6.9) |
| N3 | 18 (7.7) |
| Surgery type of breast | |
| BCS | 150 (64.4) |
| Mastectomy | 83 (35.6) |
| Lymph node resection | |
| SLNB only | 118 (50.6) |
| ALND | 115 (49.4) |
| No. of excised lymph node‡ | 9.0 ± 11.9 |
| Nodal ratio‡ | 5.7 ± 15.9 |
| Neoadjuvant chemotherapy | |
| Yes | 57 (24.5) |
| No | 176 (75.5) |
| Adjuvant chemotherapy | |
| Yes | 187 (80.3) |
| No | 17 (7.3) |
| Radiotherapy | |
| Yes | 180 (77.3) |
| No | 53 (22.7) |
BCS=breast-conserving surgery; SLNB=sentinel lymph node biopsy; ALND=axillary lymph node dissection.
*Median (range); †Clinical staging system was applied to patients with neoadjuvant chemotherapy and pathologic staging system was used for patients treated by upfront radical surgery; ‡Mean±SD.