Table 1.

Patient and tumor characteristics.

	Sentinel lymph node status
	Negative		Micrometastases		Macrometastases
Characteristic	n = 43	%	n = 13	%	n = 19	%
Age (years)
Mean	50.3 ± 1.6		50.7 ± 3.4		51.8 ± 2.5
Median	48.0		45.0		50.0
Range	31–76		35–75		35–74
Tumor histology
Ductal	39	90.7	10	76.9	16	84.2
Lobular	3	6.9	1	7.7	3	15.8
Other	1	2.3	2	15.4	0	0.0
Molecular subtypes
Luminal A	24	55.8	12	92.3	15	78.9
Luminal B	7	16.3	1	7.7	4	21.1
Her-2	3	6.9	0	0.0	0	0.0
Triple negative	9	20.9	0	0.0	0	0.0
Pathologic tumor size (cm)
Mean ± SEM	3.65 ± 0.17		3.69 ± 0.36		3.42 ± 0.28
Median	3.5		3.4		3.0
Range	2–8		2.4–7		2.4–7.5
Pathologic T classification
0	0	0.0	0	0.0	0	0.0
1	0	0.0	0	0.0	0	0.0
2	39	90.7	11	84.6	17	89.5
3	4	9.3	2	15.4	2	10.5
Scarff–Bloom–Richardson grade
I	7	16.3	3	23.1	6	31.6
II	19	44.2	7	53.8	12	63.1
III	17	39.5	3	23.1	1	5.3
Hormonal status
ER+	31	72.1	13	100	19	100
ER−	12	27.9	0	0.0	0	0.0
PgR+	29	67.4	13	100	18	94.7
PgR−	14	32.5	0	0.0	1	5.3
HER-2/neu status
Negative	34	79.1	12	92.3	16	84.2
Positive	9	20.9	1	7.7	3	15.8