Table 2. Factors associated with unsuccessful mimic SLNB and false-negative sentinel node biopsy.

Variables	Unsuccessful SLNB (n)	P value	False-negative SLNB (n)	P value
Patient number	10/110 (9.1%)		5/37 (13.5%)
Age (years)
≤50	2/39 (5.1%)	0.490	0/13 (0%)	0.140
>50	8/71 (11.3%)		5/24 (20.8%)
Tumor location
Upper outer quadrant	6/48 (12.5%)	0.658	2/11 (18.2%)	1.00
Lower outer quadrant	2/22 (9.1%)		1/7 (14.3%)
Upper inner quadrant	1/23 (4.4%)		2/12 (16.7%)
Lower inner quadrant	0/10 (0%)		0/4 (0%)
Central	1/7 (14.3%)		0/3 (0%)
Tumor size
≤2 cm	5/56 (8.9%)	0.797	3/18 (16.7%)	1.00
>2 cm	5/48 (10.4%)		2/17 (11.8%)
Pathology
Invasive ductal	9/94 (9.6%)	0.716	5/32 (15.6%)	1.00
Invasive lobular	0/4 (0%)		0/3 (0%)
Other	1/8 (12.5%)
Tumor grade
1-well differentiated	3/15 (20%)	0.347	0/1 (0%)	1.00
2-moderately differentiated	4/47 (8.5%)		3/19 (15.8%)
3-poorly differentiated	3/44 (6.8%)		2/16 (12.5%)
Type of SLC
SSLC	1/46 (2.2%)	<0.001	0/15 (0%)	0.034
PSLC	5/24 (20.8%)		1/10 (10%)
SSLC+DSLC	0/36 (0%)		4/12 (33.3%)
DSLC	1/1 (100%)		/