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Pathological and molecular characteristics of WHO-NEC
| Ki67 labeling index | |
| Median (range) | 69.1 % (40–95 %) |
| Morphology | |
| WDNEC/PDNEC | 4/7 |
| Subtypes of PDNEC | |
| Large-cell type/small-cell type | 3/4 |
| Rb immunopositivity | 45 % (5/11) |
| KRAS mutation | 54 % (6/11) |
WDNEC well-differentiated NEC, PDNEC poorly differentiated NEC
