Table 2. Univariate and multivariate analyses of prognostic factors using the Cox proportional hazards model in patients with intrathoracic metastasis.

Variables	Characteristics			Univariate analysis				Multivariate analysis
	Unfavorable	Favorable		95% CI	HR	P		95% CI	HR	P
Age (years)	≥68	<68		0.277–3.528	0.989	0.9869		–	–	–
Surgical procedure	Over lob.	Sublob.		0.085–1.905	0.402	0.2348		0.015–2.049	0.173	0.164
Histology	SCC	Non-SCC		0.015–0.570	0.093	0.0015		0.045–2.800	0.354	0.3249
EGFR	Negative or unknown	Positive		0.429–5.510	1.538	0.5053		–	–	–
Pleurodesis	Done	None		0.122–1.862	0.477	0.2761		0.188–5.210	0.989	0.9892
T status	3–4	1–2		0.429–5.510	1.538	0.5053		–	–	–
N status	Positive	Negative		0.122–1.862	0.477	0.2761		0.188–5.210	0.989	0.9892
cM status	cM1a	cM0		0.088–1.178	0.321	0.0728		0.018–1.297	0.154	0.0853

95% CI, 95% confidence interval; HR, hazard ratio; Sublob, sublobar resection; lob., lobectomy; SCC, squamous cell carcinoma; EGFR, epidermal growth factor receptor.