Table 4.

False negative SLN findings after NAST in different scenarios

Scenario	True pos (n)	False neg (n)	FNRa (%)
Overall	79	13	14.1
Dual mapping performed	71	11	13.4
IBC excluded (n = 15)	76	11	12.6
ITC considered ypN+	87	10	10.3
SLNB with 1 node retrieved	31	11	26.2
SLNB with ≥2 nodes	48	2	4.0
SLNB with ≥3 nodes	23	0	0.0

^aCalculated as the number of patients with a false negative SLN in each scenario divided by the number of false negative and true positive SLNs in the same scenario

NAST neoadjuvant systemic therapy, FNR false negative rate, SLN sentinel lymph node, SLNB sentinel lymph node biopsy, IBC inflammatory breast cancer, ITC isolated tumor cells, FNR false negative rate