Immunohistochemical results
| Marker | Neuroendocrine carcinoma | Papillary serous adenocarcinoma | Colonic adenocarcinoma |
|---|---|---|---|
| CEA, carcinoembryonic antigen; NSE, neurone specific enolase. | |||
| Chromogranin | Positive | Negative | Negative |
| Synaptophysin | Positive | Negative | Negative |
| NSE | Positive | Negative | Negative |
| Cytokeratin 7 | Negative | Positive | Negative |
| Cytokeratin 20 | Negative | Negative | Negative |
| CA125 | Negative | Positive | Negative |
| CEA | Negative | Negative | Positive |
| p53 | Negative | Negative | Positive |