Correlation between Macrophage Polarization and PD-L1-Related Tumor Microenvironmental Alteration and Metastasis in Pancreatic Ductal Adenocarcinoma

Table 5

PD-L1 expression in primary tumors compared to metastases.

	Samples	PD-L1		Z	value^∗
		Range	Median
Primary tumor	42	0–50%	0	−0.726	0.468
Metastasis	50	0–20%	0

^∗Mann–Whitney U test.