Moving a neodymium magnet promotes the migration of a magnetic tracer and increases the monitoring counts on the skin surface of sentinel lymph nodes in breast cancer

Table 4 Monitoring count on the skin surface and clinicopathologic factors

Factor		Cases	Monitoring count on the skin surface (μT)
Factor		Cases	Mean	Range	P value
Age (y)	≤39	10	3.36	2.0 ~ 6.0	p = 0.4423, *2
	40–49	14	3.33	2.5 ~ 4.5
	50–59	11	3.04	2.0 ~ 3.8
	60–69	14	2.79	1.5 ~ 4.0
	≥70	13	3.13	2.0 ~ 4.5
Body mass index (kg/m²)	< 25	47	3.15	2.0 ~ 6.0	0.8297, *1
Body mass index (kg/m²)	≥25	15	3.04	1.5 ~ 4.0
Tumor location	Lateral/Central	45	3.11	1.5 ~ 4.8	0.7268, *1
Tumor location	Medial	17	3.14	2.0 ~ 6.0
T Classification	Tis	12	3.18	1.5 ~ 4.8	0.3634, *2
	T1	42	3.06	2.0 ~ 6.0
	T2/T4	8	3.35	2.5 ~ 4.0
Surgery	Partial mastectomy	39	3.01	2.0 ~ 4.5	0.2466, *1
Surgery	Mastectomy	23	3.30	1.5 ~ 6.0
Histology	DCIS	13	3.12	1.5 ~ 4.0	0.7149, *2
	IDC	36	3.12	2.0 ~ 6.0
	Others	13	3.12	2.5 ~ 4.5
SLN detection by RI method	Success	59	3.13	1.5 ~ 6.0	0.7413, *1
SLN detection by RI method	Failure	3	2.93	2.5 ~ 3.3
Metastasis of SLN	None	50	3.18	1.5 ~ 6.0	0.1867, *2
	Micrometastasis	2	2.40	2.3 ~ 2.5
	Macrometastasis	10	2.95	2.0 ~ 4.0
		1: Mann-Whitney test, 2: Kruskal-Wallis test

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