Table 3.
Pathologic status of sentinel and axillary lymph nodes in the negative conversion groupa)
| SLNs | Axillary lymph nodeb) |
||
|---|---|---|---|
| Positive | Negative | Total | |
| Positive | 20 (TP) | 0 | 20 |
| Negative | 4 (FN) | 24 (TN) | 28 |
| Total | 24 | 24 | - |
SLN, sentinel lymph node; TP, true positive; FN, false negative; TN, true negative; FP, false positive.
a)
Fifty-five patients underwent a complete axillary lymph node dissection (excluding eight patients who did not have SLNs identified=48 evaluable patients),
b)
Sensitivity: TP/(TP+FN)=14/18=77.8%; specificity: TN/(TN+FP)=24/24=100%; positive predictive value: TP/(TP+FP)=20/20=100%; negative predictive value: TN/(TN+FN)=24/28=61.5%; overall accuracy: (TP+TN)/number of patients=(20+24)/48=91.7%; false-negative rate: FN/(TP+FN)=4/(20+4)=16.7%.