TABLE 1.

Expression of PD-L1 and PD-L2, and CD8 T-lymphocyte infiltration

Marker	Degree of expression (mean ± standard deviation); n = 23 samples
PD-L1 overall*	1.4 ± 0.9 (n = 23); expression was 0 in 2 samples
PD-L1 tumor	0.73 ± 1.1
PD-L1 stroma	1.1 ± 1.1
PD-L1 endothelium	0.96 ± 1.1
PD-L2 overall†	0.83 ± 1.1 (n = 23); expression was 0 in 4 samples
PD-L2 tumor	0.22 ± 0.85
PD-L2 stroma	0.87 ± 1.2
PD-L2 endothelium	0.04 ± 0.21
CD8 overall‡	1.1 ± 0.51 (n = 23); expression was 0 in 2 samples
CD8 tumor	0.39 ± 0.5
CD8 stroma	1.3 ± 0.62
Combined positive score	Degree of expression (mean ± standard deviation); n = 23 samples
PD-L1 ≥ 1	57% (n = 13 samples)
PD-L1 < 1	43% (n = 10 samples)

^*PD-L1 scored on a 0–5 scale.

^†PD-L2 scored on a 0–5 scale.

^‡CD8 scored on a 0–3 scale.

PD-L, programmed celi death ligand.