Table 3. Univariate and multivariate Cox regression analyses of PFS for patients.

Variable	Univariate analysis			Multivariate analysis
	HR (95% CI)	P		HR (95% CI)	P
Abundance: ≤0.1% vs. >0.1%	2.21 (0.96–4.96)	0.011		2.41 (1.12–5.20)	0.025
ECOG PS: >1 vs. 0 or 1	2.29 (0.86–6.12)	0.029		1.83 (1.19–2.82)	0.006
Age: ≤65 vs. >65 years	0.83 (0.42–1.53)	0.476
Female vs. male	0.84 (0.45–1.56)	0.561
T3+4 vs. T1+2 stage	1.12 (0.57–2.16)	0.728
N2+3 vs. N0+1 stage	0.97 (0.51–1.88)	0.725
Smokers vs. non-smokers	1.31 (0.59–2.94)	0.446