2.

Comparison of 5-year DFS and LRR

Variables	DFS				LRR
	HR	95% CI	P		HR	95% CI	P
DFS, disease-free survival; LRR, local relapse rate; ET, endocrine therapy; RT, radiotherapy; HR, hazard ratio; 95% CI, 95% confidence interval.
All
ET	1.00		0.005		1.00		0.003
ET+RT	1.59	1.15−2.19			3.33	1.51−7.34
Luminal A
ET	1.00		0.293		1.00		0.101
ET+RT	1.28	0.81−2.04			2.51	0.84−7.52
Luminal B
ET	1.00		0.001		1.00		0.005
ET+RT	2.19	1.37−3.49			5.45	1.65−17.98
ET
Luminal A	1.00		0.003		1.00		0.220
Luminal B	1.84	1.23−2.75			1.62	0.75−3.49