3.

Comparison of 5-year OS and DMR

Variables	OS				DMR
	HR	95% CI	P		HR	95% CI	P
OS, overall survival; DMR, distant metastasis rate; ET, endocrine therapy; RT, radiotherapy; HR, hazard ratio; 95% CI, 95% confidence interval.
All
ET	1.00		0.149		1.00		0.580
ET+RT	1.32	0.91−1.93			1.34	0.47−3.79
Luminal A
ET	1.00		0.793		1.00		0.988
ET+RT	1.08	0.62−1.85			0.99	0.16−5.93
Luminal B
ET	1.00		0.048		1.00		0.307
ET+RT	1.75	1.01−3.05			2.00	0.53−7.52
ET
Luminal A	1.00		0.026		1.00		0.064
Luminal B	1.76	1.07−2.91			3.87	0.92−16.20