Table 3.

Factors that affect PFS based on Cox multivariate regression analysis.

FACTOR	PFS
	HR	95% CI	P value
Age	6.929	1.376–31.938	0.018
Disease stage	0.773	0.225–2.338	0.648
Sex	0.382	0.138–1.313	0.509
Histological subtype	0.426	0.111–2.319	0.137
PD-L1 status	0.581	0.269–10.251	0.581