Table 1.
Clinical and histopathological characteristics.
| Group | Patients with positive SLN (n = 35) | Patients with negative SLN (n = 27) | P-value |
|---|---|---|---|
| Number of lesions | 35 | 27 | |
| Mean age (mean ± SD) | 48.14 ± 8.35 | 49.78 ± 12.53 | 0.541 |
| Mean size (mean ± SD) | 3.60 ± 1.85 | 2.98 ± 1.45 | 0.157 |
| Histological type | |||
| Invasive ductal carcinoma | 35 | 27 | |
| Histological grade | 0.03 | ||
| I | 6 | 14 | |
| II | 11 | 9 | |
| III | 18 | 4 | |
| ER | 0.697 | ||
| + | 23 | 19 | |
| – | 12 | 8 | |
| PR | 0.812 | ||
| + | 21 | 17 | |
| – | 14 | 10 | |
| HER-2 | 0.780 | ||
| + | 27 | 20 | |
| – | 8 | 7 | |
| Ki-67 | 0.094 | ||
| + | 23 | 12 | |
| – | 12 | 15 |
Two-tailed two-sample t-test with unequal variances was used to compare the age and the primary tumor size. Chi-square cross-tabulation was used to test the histological grade and immunohistochemical marker (ER, PR, HER2, and Ki-67). SLN, sentinel lymph node; SD, standard deviation.