Table 2.

Comparison of PD-L1 positivity in primary versus metastatic sites

Tissue	PD-L1+ immune cell	PD-L1− immune cell	P value	PD-L1+ tumor cell	PD-L1− tumor cell	P value
Primary	114	65	0.0001	15	164	0.1313
Metastasis	68	93		7	154

PD-L1, Programmed Death Ligand 1.