TABLE 2.
SN and non-SN characteristics of 357 invasive breast cancer patients with a positive SN and subsequent axillary lymph node dissection
| Feature | No. | % |
|---|---|---|
| SN | ||
| Total number of SNs | 571 | |
| Mean number of SNs | 1.6 | |
| Total number of positive SNs | 419 | |
| Mean diameter SN metastases | 4.7 mm | |
| AJCC classification of SN metastatic size | ||
| ITC | 24 | 7 |
| Micrometastasis | 112 | 31 |
| Macrometastasis | 221 | 62 |
| Extracapsular extension | ||
| No | 257 | 72 |
| Yes | 100 | 28 |
| Microanatomic location | ||
| Subcapsular | 167 | 47 |
| Parenchymal | 11 | 3 |
| Combined | 40 | 11 |
| Extensive | 139 | 39 |
| Mean penetrative depth | 2.9 mm | |
| Non-SNs | ||
| Total number of non-SNs | 4939 | |
| Mean number of non-SNs (range) | 14 (5–38) | |
| Total number of positive non-SNs | 474 | |
| Total number of negative non-SNs | 4465 | |
| Size of non-SN metastases | ||
| ITC | 3 | 2 |
| Micrometastases | 33 | 24 |
| Macrometastases | 100 | 74 |