Table 2. Univariate analysis of prognostic factors for locoregional recurrence-free survival.

Characteristic	Entre cohort			Without PMRT
	HR	95% CI	P	HR	95% CI	P
Age, years (<35 vs. ≥35)	1.526	0.799–2.916	0.201	1.787	0.934–3.418	0.079
Menopausal status (premenopausal vs. postmenopausal)	0.793	0.465–1.350	0.393	0.725	0.425–1.237	0.238
Tumor size (pT2 vs. pT1)	2.119	1.134–3.961	0.019	2.322	1.241–4.346	0.008
Positive lymph nodes, n (2–3 vs. 1)	1.925	1.154–3.212	0.012	2.201	1.317–3.679	0.003
Lymphatic invasion (negative vs. positive)	0.793	0.194–3.241	0.747	1.050	0.257–4.291	0.946
Breast cancer subtype
(luminal B vs. luminal A)	1.031	0.509–2.087	0.933	1.159	0.572–2.347	0.682
(Her2 positive vs. luminal A)	2.782	1.525–5.075	0.001	2.903	1.575–5.351	0.001
(triple negative vs. luminal A)	1.899	0.938–3.844	0.075	1.966	0.971–3.978	0.060
LNR, % (> 0.20 vs. ≤ 0.20)	1.250	0.638–2.451	0.516	1.471	0.727–2.976	0.283
PMRT (yes vs. no)	0.103	0.014–0.739	0.024

PMRT, postmastectomy radiotherapy; LNR, lymph node ratio; HR, hazard ratio; CI, confidence interval.