Histopathologic Characteristics
| Characteristic | Data |
|---|---|
| Synaptophysin (IHC) | |
| Positive | 30 (83.3%) |
| Negative | 6 (16.7%) |
| Chromogranin A (IHC) | |
| Positive | 26 (72.2%) |
| Negative | 3 (8.3%) |
| Not known | 7 (19.4%) |
| Epithelial markers (AE1/AE3; IHC) | |
| Positive | 11 (30.6%) |
| Negative | 2 (5.6%) |
| Not known | 23 (63.9%) |
| Other IHC markers (ATRX, cytokeratin, CD56, CK7, CK19, CK20, and CDX2) | |
| Positive | 10 (27.8%) |
| Not known | 26 (72.2%) |
Data are number and percentage.