Table 3.

Pathologic outcomes of propensity score-matched patients in MWA group and control group.

Variables	MWA (n = 21)	Control (n = 42)	P value
Positive margin	1 (4.8%)	6 (14.3%)	0.408*
Positive/close margin	2 (9.5%)	16 (38.1%)	0.018
Mean specimen volume (mL) ‡	152.0 ± 102.9	96.0 ± 67.8	0.014
Largest margin > 3cm ‡	2 (10.0%)	7 (17.5%)	0.704*
Accurate surgery	17 (81.0%)	23 (54.8%)	0.042
Tumor size at pathology
≤2 cm	6	22	0.073
>2 cm	15	20
Axillary status
Negative	14	32	0.422
Positive	7	10

*Fisher’s exact test. ^‡available in MWA (n=20) and control (n=40) group.

MWA, microwave ablation.

Accurate surgery is defined as the largest margin ≤ 3 cm and the smallest margin ≥ 1mm.