Clinical and pathological characteristics
| Clinical and pathological characteristics | HLN (N = 17) | SLN- (N = 44) | SLN+ (N = 14) | p-value |
|---|---|---|---|---|
| Age (mean ± SD) | 38.7 ± 11.8 | 59.1 ± 10.2 | 52.9 ± 12.9 | 0.07 A |
| Primary tumor size (cm) | 1.41 ± 0.69 | 2.67 ± 2.08 | 0.002 A | |
| T stage | <0.01 B | |||
| T1 (< 2 cm) | 38 | 6 | ||
| T2 (≥ 2–5 cm) | 6 | 7 | ||
| ≥T3 (> 5 cm) | 0 | 1 | ||
| Histology | 0.72 B | |||
| Ductal | 35 | 12 | ||
| Lobular | 4 | 1 | ||
| Mixed ductal/lobular | 3 | 0 | ||
| Papillary | 1 | 0 | ||
| Mucinous | 1 | 1 | ||
| Differentiation grade | 0.35 B | |||
| 1 | 10 | 3 | ||
| 2 | 22 | 6 | ||
| 3 | 12 | 4 | ||
| Unknown | 0 | 1 | ||
| ER expression | 0.39 C | |||
| Yes | 39 | 11 | ||
| No | 5 | 3 | ||
| PR expression | 1.00 C | |||
| Yes | 35 | 11 | ||
| No | 9 | 3 | ||
| HER2 amplification | 1.00 C | |||
| Yes | 8 | 3 | ||
| No | 36 | 11 | ||
| Breast cancer subtype | 0.45 B | |||
| HR positive (ER+ and/or PR+) | 39 | 11 | ||
| HER2+ | 4 | 1 | ||
| TNBC | 2 | 2 |
Aby two-sided unpaired t-test; B by Pearson chi-square test; C by Fisher’s exact test