Table 2.

The sentinel lymph node demographics for invasive lobular carcinomas and invasive ductal carcinomas

	ILC	IDC	Total cases	P-value
Frozen section analysis of SLN
Positive	36 (28%)	33 (25%)	69 (26%)	0.622
Negative	95 (73%)	100 (75%)	195 (74%)
Permanent section analysis of SLN
Positive	54 (41%)	44 (33%)	98 (37%)	0.171
Negative	77 (59%)	89 (67%)	166 (63%)
Size of SLN metastasis (mm)	6.0 (0.5–25.0)	5.0 (0.1–32.0)	5.5 (0.1–32.0)	0.808
Classification of metastatic disease
Macrometastatic (>2.0 mm)	36 (28%)	28 (21%)	64 (24%)	0.378
Micrometastatic (≤ 2.0 mm)	16 (12%)	12 (9%)	28 (11%)
Unknown classification	2 (1.5%)	4 (3%)	6 (2%)
No metastatic disease	77 (59%)	89 (67%)	166 (63%)

ILC, invasive lobular carcinoma; IDC, invasive ductal carcinoma; SLN, sentinel lymph node