Table 2.

Univariate Analysis of Disease-Free Survival in the Training Set

Characteristics		Log Rank Test
		X2	P-value
Age	>47	37.821	0.386
	≤47
Tumor size	>2.7	5.706	0.017
	≤2.7
Enhancement type	Mass	2.848	0.091
	Non-mass
Multifocal or multicenter	Present	1.030	0.310
	Absent
Mass shape	Round/oval	0.998	0.318
	Irregular
Tumor margin	Circumscribed	2.768	0.096
	Not circumscribed
Internal enhancement	Homogeneous	1.742	0.187
	Heterogeneous
Site of tumor	Right	1.118	0.29
	Left
Pre-NAC Tstage	2	1.024	0.312
	3
Pre-NAC Nstage	0	57.583	<0.001
	1
	2
	3
Menopausal status	Premenopausal	0.028	0.868
	Postmenopausal
Ki67	High	1.928	0.165
	Low
PCR	Yes	0.700	0.403
	No

Abbreviations: NAC, neoadjuvant chemotherapy; PCR, pathological complete response.