Table 3. Cox proportional hazard regression models for prognostic factors of survival after diagnosis of BM.

Variables	Total N = 78	Univariate	Multivariate
		p	p	HR	95%CI
Sex		0.247	0.567	0.796	0.364–1.740
Female	37
Male	41
Dx age (each one year older)		0.032	0.010	1.036	1.009–1.064
Smoking		0.088	0.190	1.573	0.800–3.091
No	42
Yes	36
Stage
IA	11
IB	8	0.926	0.792	0.852	0.260–2.794
IIA	4	0.288	0.209	2.605	0.584–11.616
IIB	4	0.633	0.471	1.910	0.329–11.095
IIIA	28	0.568	0.554	0.757	0.301–1.905
IIIB	23	0.114	0.128	2.050	0.813–5.170
Tumor size		0.367	0.609	0.827	0.398–1.716
≤30mm	35
>30mm	43
EGFR mutation status 1		0.417	0.304	0.687	0.335–1.407
Wild-type	29
Mutant	49
EGFR mutation status 2		0.095	0.192	0.598	0.276–1.294
Wild-type	29
Exon 19 deletion	18	0.118	0.139	0.486	0.187–1.265
Other mutations	31	0.938	0.471	0.765	0.368–1.587
Radiation therapy		0.157	0.422	0.513	0.100–2.619
No	22
Yes	56