Accuracy of axillary ultrasound in preoperative nodal staging of breast cancer - size of metastases as limiting factor

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Table 3 False-negative rate of axillary ultrasound (AUS) in different subgroups of 166 nodal-positive patients

	pN+	AUS positive	AUS negative		p
		n	n	%
Age (years)					n.s.
≤50	28	16	12	42.9
>50	138	63	75	54.3
BMI					n.s.
<25	60	28	32	53.3
25-29.9	59	24	35	59.3
≥30	46	26	20	43.5
Tumour stage					0.001
pT1	62	20	42	67.7
pT2	81	42	39	48.1
pT3 & pT4	23	17	6	26.1
Histological subtype					n.s.
Ductal	128	66	62	48.4
Lobular	16	5	11	68.8
Others	22	8	14	63.6
Grading					0.005
G1	6	1	5	83.3
G2	88	34	54	61.4
G3	72	44	28	38.9
Lymphangiosis					0.001
No	33	7	26	78.8
Yes	133	72	61	45.9
Growth pattern					n.s.
Unifocal	139	65	74	53.2
Multicentric	25	14	11	44.0
ER status					0.024
Positive	129	55	74	57.4
Negative	37	24	13	35.1
PR status					0.014
Positive	109	44	65	59.6
Negative	57	35	22	38.6
HER2 status					0.007
Negative	150	66	84	56
Positive	16	13	3	18.8
Ki-67					<0.001
≤14%	38	9	29	76.3
>14%	122	69	53	43.4
Total	166	79	87	52.4