Table 2.

Biomarker Staining

Biomarker	n (%)
MMR, all subtypes
Intact	28(100)
Deficient	0
PD-L1
Small Cell
Positive	1(5)
Negative	21(95)
Undifferentiated
Positive	1(33%)
Negative	2(66%)
Mixed
Positive	3(50%)
Negative	3(50%)
SST, small cell
Positive	1(5)
Negative	18(95)
PARP-1, small cell
High	6(55)
Moderate	4(36)
Low	0
Negative	1(9)

MMR, Mismatch Repair; SST, Somatostatin; PD-L1, Programmed death-ligand 1; PARP-1, Poly-(ADP-Ribose) Polymerase 1. H-score ≥100 is High and H-score 40-100 is Moderate.