Table 3. Positive lymph nodes and false negative rate.
| Lymph nodes rate | Total (N=456) | PSN (N=444) | PSN + ASN (N=444) | NSABP B-32 |
|---|---|---|---|---|
| Positive nodes (pN+) rate | 32.7% (149/456) | 28.5% | ||
| Positive nodes in SLN biopsy rate | 32.4% (144/444) | 29.5% (131/444) | 30.9% (137/444) | 26% |
| False negative rate | 9% (13/144) | 4.9% (7/144) | 9.8% | |
| Sensitivity | 91% (131/144) | 95.1% (137/144) | 91.2% | |
| Negative predictive value | 95.8% (300/313) | 97.7% (300/307) | 96.1% | |
| Micrometastases | 26 | 24 | 24 | – |
PSN, principal sentinel lymph nodes; ASN, accessory sentinel lymph nodes.