Table 5.

Multivariate survival analysis for disease-free survival and overall survival

Variables	DFS			OS
	HR	95 % CI	P	HR	95 % CI	P
Smoking status (smokers vs. non-smokers)	0.84	0.66–1.07	0.16	1.12	0.81–1.53	0.48
Stage (III vs. I + II)	1.71	1.32–2.21	0.00	1.16	0.84–1.58	0.00
PD-L1 expression (positive vs. negative)	1.17	0.91–1.51	0.22	1.79	1.30–2.46	0.37