Table 3.

The Relationship Between Characteristics of Patients and PD-1 Therapy

Characteristics	PD-1
	ρ	P
Sex	0.034	0.716
Age	−0.133	0.147
Tumor size	−0.038	0.683
TNM Classification	0.019	0.833
Lymphatic metastasis	0.035	0.708
Survival time*	0.735	<0.001*

Notes: Spearman correlation test was used. *P<0.05.

Abbreviation: PD-1, Programmed cell death protein 1.