Table 1.
Patient characteristics of the sentinel node‐positive and sentinel node‐negative groups
| Characteristics | Sentinel node positive | Sentinel node negative | P‐value | ||
|---|---|---|---|---|---|
| n | % | n | % | ||
| Number of patients | 12 | 100.0 | 12 | 100.0 | |
| Age (years) | |||||
| Median (range) | 53.5 (37–75) | 49.5 (40–75) | 0.91 | ||
| Palpability | |||||
| Palpable | 4 | 33.3 | 3 | 25.0 | 1.00 |
| Non‐palpable | 8 | 66.7 | 9 | 75.0 | |
| Mammographic findings | |||||
| Mass | 2 | 16.7 | 4 | 33.3 | 0.85 |
| Calcification | 7 | 58.3 | 6 | 50.0 | |
| Others | 2 | 16.7 | 1 | 8.3 | |
| None | 1 | 8.3 | 1 | 8.3 | |
| Breast biopsy method | |||||
| Needle with vacuum assist | 7 | 58.3 | 8 | 66.7 | 1.00 |
| Needle without vacuum assist | 3 | 25.0 | 3 | 25.0 | |
| Ductoscopic | 2 | 16.7 | 1 | 8.3 | |
| Period from breast biopsy to surgery (days) | |||||
| Median (range) | 82 (13–281) | 77.5 (19–154) | 1.00 | ||
| Breast surgery | |||||
| Partial mastectomy | 7 | 58.3 | 7 | 58.3 | 1.00 |
| Total mastectomy | 5 | 41.7 | 5 | 41.7 | |
| Pathological size (cm) | |||||
| Median (range) | 4.7 (1.7–6.8) | 5.05 (2–6.5) | 0.79 | ||
| Subtype | |||||
| Comedo | 3 | 25.0 | 3 | 25.0 | 1.00 |
| Non‐comedo | 9 | 75.0 | 9 | 75.0 | |
| Nuclear grade | |||||
| 1 | 6 | 50.0 | 8 | 66.7 | 0.85 |
| 2 | 4 | 33.3 | 2 | 16.7 | |
| 3 | 2 | 16.7 | 2 | 16.7 | |
| Estrogen receptor | |||||
| + | 11 | 91.7 | 11 | 91.7 | 1.00 |
| − | 1 | 8.3 | 1 | 8.3 | |
| Progesterone receptor | |||||
| + | 9 | 75.0 | 10 | 83.3 | 1.00 |
| − | 3 | 25.0 | 2 | 16.7 | |
| Number of step‐section specimen (slides) | |||||
| Median (range) | 53.5 (17–344) | 59 (27–168) | 0.73 | ||