A Predictive Model for Nonsentinel Node Status after Sentinel Lymph Node Biopsy in Sentinel Lymph Node-Positive Chinese Women with Early Breast Cancer

Table 1

Comparison of clinicopathological characteristics between the model group and the validation group.

Data	Model group	Validation group	value
Age
≤35	16	2	0.382
>35	212	58
Menopausal status
Premenopausal	116	32	0.735
Postmenopausal	112	28
Tumor location
Upper outer	116	34	0.951
Lower outer	32	7
Lower inner	13	3
Upper inner	43	11
Central	23	5
Tumor size (cm)
Mean	3.31	3.16	0.318
Median	3	3
SD	1.29	0.95
Tumor type
Infiltrating ductal carcinoma	202	58	0.84
Invasive lobular carcinoma	9	0
Other carcinomas	17	2
Lymphovascular invasion
Yes	31	2	0.023
No	197	58
Histological grade
G1	12	6	0.543
G2	69	19
G3	136	33
Gx	11	2
Multifocality
Yes	18	1	0.139
No	210	59
Estrogen receptor
Negative	59	15	0.890
Positive	169	45
Progesterone receptor
Negative	87	18	0.243
Positive	141	42
HER2/neu receptor
Negative	165	45	0.643
Positive	63	15
Ki-67 status
≤14%	33	12	0.294
>14%	195	48
Molecular subtypes
Luminal A	28	13	0.159
Luminal B1	113	20
Luminal B2	29	8
Her2-positive	34	10
Triple negativity	24	9
Number of SLN
Mean	2.90	3.42	0.016
Median	3	3
SD	1.48	1.44
Number of metastatic SLN
Mean	1.43	1.87	0.007
Median	1	1
SD	0.73	1.16
Number of nonmetastatic SLN
Mean	1.46	1.55	0.663
Median	1	2
SD	1.35	1.32
Number of non-SLN
Mean	13.05	14.37	0.264
Median	13	13
SD	5.31	5.63