Table 4. Bivariate analysis of categorical variables as possible predictors of involvement of the remaining axillary nodes and SN false-negatives and false-positives, Fisher test.
| Features | Remaining axillary nodes status | SN false-negatives | SN false-positives | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| None metastatic, fraction (%) | >1 metastatic, fraction (%) | P | No FN, fraction (%) | FN, fraction (%) | P | No FP, fraction (%) | FP, fraction (%) | P | |||
| Postmenopausal patient | 3/12 (25.0) | 7/13 (53.8) | 0.22 | 7/18 (38.9) | 3/7 (42.9) | 1.00 | 9/20 (45.0) | 1/5 (20.0) | 0.61 | ||
| Palpable metastatic node | 6/12 (50.0) | 8/13 (61.5) | 0.56 | 11/18 (61.1) | 3/4 (42.9) | 0.66 | 10/20 (50.0) | 4/5 (80.0) | 0.34 | ||
| >1 suspicious axillary node on US | 4/12 (33.3) | 8/13 (61.5) | 0.15 | 7/18 (38.9) | 5/7 (71.4) | 0.20 | 9/20 (45.0) | 3/5 (60.0) | 0.64 | ||
| >1 suspicious node on MRI | 4/11 (36.4) | 4/9 (55.6) | 0.65 | 6/15 (40.0) | 3/5 (60.0) | 0.61 | 8/15 (53.3) | 1/5 (20.0) | 0.31 | ||
| >1 suspicious node on CT | 2/12 (16.6) | 4/13 (30.7) | 0.10 | 4/18 (22.2) | 2/7 (28.5) | 0.37 | 4/20 (20.0) | 2/5 (40.0) | 0.43 | ||
| Pathological type: lobular carcinoma | 6/12 (50.0) | 7/13 (53.8) | 0.68 | 8/18 (44.4) | 3/7 (42.8) | 0.13 | 5/20 (25.0) | 2/5 (40.0) | 0.59 | ||
| Histological grade II in the surgical specimen | 2/12 (16.7) | 3/13 (23.1) | 0.10 | 4/18 (22.2) | 1/7 (14.3) | 0.46 | 3/20 (15.0) | 2/5 (40.0) | 0.37 | ||
| Lymphovascular invasion in the surgical specimen | 6/12 (50.0) | 7/13 (53.8) | 0.84 | 9/18 (50.0) | 4/3 (57.1) | 1.00 | 9/20 (45.0) | 4/5 (80.0) | 0.32 | ||
| Extracapsular nodal extension | 4/12 (33.3) | 7/13 (53.8) | 0.30 | 6/18 (33.3) | 5/7 (71.4) | 0.18 | 9/20 (45.0) | 2/5 (40.0) | 1 | ||
SN, sentinel node; FN, false negative; FP, false positive; US, ultrasound; MRI, magnetic resonance imaging; CT, computed tomography.