Table 2.

Univariate Analysis of Clinicopathologic Factors Predictive of Non-SLN Metastases

Characteristic	Odds Ratio	95% CI	P-value
Age (per year)	1.002	0.985–1.019	.83
Pathologic tumor size (cm) (per unit)	1.199	1.074–1.337	.001
Histology			.03
IDC	Reference	-
ILC	1.731	0.905–3.310
mixed IDC/ILC	0.513	0.265–0.994
other	0.420	0.092–1.923
Grade			.53
I	Reference	-
II	1.317	0.655–2.645
III	1.496	0.730–3.067
Multifocal disease			.28
yes	1.312	0.799–2.154
no	Reference	-
ER			.65
positive	1.138	0.655–1.978
negative	Reference	-
PR			.15
positive	0.744	0.497–1.114
negative	Reference	-
HER2			.64
positive	1.123	0.694–1.817
negative	Reference	-
LVI			.02
present	1.594	1.080–2.353
absent	Reference
Number of SLN identified	0.765	0.666–0.879	<.001
Number of positive SLN	1.706	1.323–2.200	<.001
SLN maximum metastasis size (mm)	1.186	1.129–1.246	<.001
Extranodal extension			<.001
present	3.388	2.195–5.230
absent	Reference	-

Abbreviations: CI, confidence interval; IDC, invasive ductal carcinoma; ILC, invasive lobular carcinoma; ER, estrogen receptor ; PR, progesterone receptor, HER2, HER2/neu ; LVI, lymphovascular invasion ; SLN, sentinel lymph node