Biomarker staining
| Biomarker | n (%) |
| MMR, all subtypes | |
| Intact | 28 (100) |
| Deficient | 0 |
| PD-L1 | |
| Pure neuroendocrine | |
| Positive | 2 (8) |
| Negative | 23 (92) |
| 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) |
H-score ≥100 is high and H-score 40–100 is moderate.
MMR, mismatch repair; PARP-1, Poly-(ADP-ribose) polymerase 1; PD-L1, programmed death-ligand 1; SST, somatostatin.