Table 4.

Univariate analysis of prognostic factors (Cox proportional hazard model)

Overall survival		HR	95% CI	P
Stage at initial diagnosis	I + II versus III + IV	0.478	0.267–0,855	0.013
Prior systemic immunotherapy	Yes or No	0.078	0.011–0.569	0.012
Recurrence‐free survival		HR	95% CI	P
Stage at initial diagnosis	I + II versus III + IV	0.577	0.328–0.995	0.041
Adjuvant chemotherapy	Yes or No	0.449	0.255–0.792	0.006

CI, confidence interval; HR, hazard ratio.