Diagnostic value of preoperative examination for evaluating margin status in breast cancer

Table 1 Patient basic information

Imaging/pathological features	Training group		Validation group
	M+ group (n = 40)	M- group (n = 186)	M+ group (n = 17)	M- group (n = 80)
Age	56.15 ± 13.54	59.01 ± 10.38	65.87 ± 9 .31	55.98 ± 10.63
Group, n (%)
BCS	19 (47.5)	185 (99.5)	8 (47.1)	78 (97.5)
Non-BCS	21 (52.5)	1 (0.5)	9 (52.9)	2 (2.5)
Molecular subtypes, n (%)
Luminal A	9 (22.5)	64 (34.4)	1 (6.7)	31 (38.8)
Luminal B_ Her2(-)	16 (40.0)	70 (37.6)	8 (47.1)	33 (41.3)
Luminal B_ Her2(+)	5 (12.5)	29 (15.6)	5 (29.4)	9 (11.3)
HER2_ enriched	6 (15.0)	6 (3.2)	2 (11.8)	4 (5.0)
TNBC	4 (10.0)	17 (9.1)	0 (0.0)	3 (3.8)
Tumor size	2.5 (1.1-6.0)	2.08 (0.50-5.40)	2.27 (1.3-5.0)	1.95 (0.80-6.70)

All cases were randomly divided into a training group (226 cases, 69.97%) and a validation group (97 cases, 30.03%). Patients with positive margins in each group belonged to the M+ group, while those with negative margins belonged to the M- group. BCS: Breast-conserving surgery.