Selective omission of sentinel lymph node biopsy in mastectomy for ductal carcinoma in situ: identifying eligible candidates

Table 4 Baseline characteristics according to axillary lymph node metastasis

Variables	Node-negative (n = 368)		Node-positive (n = 17)
Variables	N	(%)	N	(%)	p-value
Age (y)					0.032
≤ 50	206	56	14	82.4
> 50	162	44	3	17.6
Palpable mass or bloody nipple discharge					0.197
No	210	57.1	7	41.2
Yes	158	42.9	10	58.8
Clinical tumor size, median (range), cm	4.5 (0.5–12.9)		5.1 (1.5–9.6)		0.112
Suspicious axillary lymph node on radiologic evaluation					< 0.001
No	291	79.1	5	29.4
Yes	77	20.9	12	70.6
Suspicious microcalcification on radiologic evaluation					> 0.999
No	114	31	5	29.4
Yes	254	69	12	70.6
Nuclear grade^*,†					0.489^‡
Low	52	16.8	1	7.7
Intermediate	177	57.1	7	53.8
High	81	26.1	5	38.5
Comedo necrosis^*,†					> 0.999^‡
No	107	36.4	4	36.4
Yes	187	63.6	7	63.6
Hormone receptor^§					0.500
Negative	96	26.1	3	17.6
Positive	269	73.1	13	76.5
HER2^§					0.071
Negative	240	65.2	14	82.4
Positive	125	34.0	2	11.8
Ki-67 (%) ^§					0.381
< 14%	264	71.7	10	58.8
≥ 14%	100	27.2	6	35.3

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