Table II.

Multivariate Cox's regression analysis for PD-L1 expression levels and the prognosis of patients with colorectal cancer.

Variable	Hazard ratio	95% CI	P-value
PD-L1
Positive vs. Negative	1.937	1.038–3.616	0.038
Perineural invasion
Positive vs. Negative	2.416	1.330–4.389	0.004
TNM stage
III vs. I–II	2.206	1.181–4.123	0.013

P-values were calculated using multivariate Cox's regression analysis and the stepwise selection method for tumor classification, vascular & lymphatic infiltration, perineurium invasion, TNM stage and PD-L1 expression. PD-L1, programmed death ligand 1; TNM, tumor-node-metastasis.