Gastric NET classification and features
| Characteristic | Type I | Type II | Type III |
| Associated disease | Chronic atrophic gastritis-A and pernicious anaemia | Zollinger Ellison syndrome and MEN-1 | None |
| Proportion of tumours | 80% | 5% | 15% |
| Site of tumour | Fundus/body | Fundus/body (occasionally antrum) | Antrum or fundus |
| Number of tumours | Multiple | Multiple | Single |
| Size of tumour | <1 cm | <1 cm | 2–5 cm |
| Plasma gastrin concentration | High | High | Normal |
| Gastric acid output | Low | High | Normal |
| Prognosis | Good | Good | Poor |
MEN, multiple endocrine neoplasia.