A Novel Predictive Nomogram including Serum Lipoprotein a Level for Nonsentinel Lymph Node Metastases in Chinese Breast Cancer Patients with Positive Sentinel Lymph Node Metastases

Table 1

Descriptive characteristics of the primary cohort and validation cohort.

	Primary cohort ()		Validation cohort ()
		%		%
Age (year)					0.607
≤50	66	56.9	49	52.7
>50	50	43.1	44	47.3
Pathologic size (cm)					0.103
≤0.5	7	6.0	2	2.2
0.6-1.0	19	16.4	9	9.7
1.1-2.0	59	50.9	29	31.2
2.1-3.0	26	22.4	31	33.3
3.1-4.0	2	1.7	15	16.1
4.1-5.0	2	1.7	5	5.4
≥5.1	1	0.9	2	2.1
Tumor type					0.976
Ductal	114	98.3	92	98.9
Lobular	2	1.7	1	1.1
Lymphovascular invasion					0.339
No	94	81.0	81	87.1
Yes	22	19.0	12	12.9
Multifocality					0.900
No	112	96.6	88	94.6
Yes	4	3.4	5	5.4
Estrogen-receptor status					0.718
Negative	17	14.7	12	12.9
Positive	99	85.3	81	87.1
No. of positive SLN					0.255
1	57	49.1	48	51.6
2	27	23.3	20	21.5
3	16	13.8	13	14.0
4	9	7.8	3	3.2
5	4	3.4	4	4.3
6	1	0.9	2	2.2
7	2	1.7	3	3.3
No. of negative SLN					0.314
0	20	17.2	14	15.1
1	20	17.2	9	9.7
2	26	22.4	18	19.4
3	16	13.8	18	19.4
4	13	11.2	16	17.2
5	6	5.2	7	7.5
6	9	7.8	5	7.2
7	6	5.2	5	7.2
Non-SLN metastases					0.397
Yes	58	50.0	52	55.9
No	58	50.0	41	54.1