Table 1.

Patient and tumor characteristics of 256 clinically node-negative invasive breast cancer patients undergoing AUS +/− FNAB/needle core biopsy

Characteristic	Number of patients (%)
Mean age (years)	50.4
T stage (%)
T1	168 (65.6)
T2	70 (27.3)
T3	11 (4.3)
T4	7 (2.7)
Clinical Stage (%)
I	125 (48.8)
II	109 (42.6)
III	22 (8.6)
Pathologic Stage (%)
I	118 (46.1)
II	102 (39.8)
III	36 (14.1)
Type of Surgery (%)
BCT	169 (66.0)
Mastectomy	87 (34.0)
Pathological node stage (%)
N0	155 (60.5)
N1	74 (28.7)
N2	21 (8.2)
N3	6 (2.3)
ER status (%)
Positive	167 (65.0)
Negative	89 (35.0)
PR status (%)
Positive	128 (50.0)
Negative	126 (50.0)
Her2-neu status (%)
Positive	43 (17.0)
Negative	213 (83.0)
Neoadjuvant chemotherapy (%)	87 (34.0)

AUS = axillary ultrasound; FNAB = fine needle aspiration biopsy; BCT= breast conserving therapy; ER = estrogen receptor; PR = progesterone receptor