|
| | Type I | Type II | Type III |
|
| Proportion of gastric carcinoids | 70%–80%—most common | Less than 5% | 15%–20% |
| Associations | Chronic atrophic gastritis, pernicious anemia | MEN-1, Zollinger-Ellison syndrome | Sporadic carcinoid syndrome |
| Epidemiology | Typically women 50–70 yrs old | Family history of MEN-1 syndrome | Increased in African Americans, most common in men |
| Plasma gastrin levels | High | High | Normal |
| Gastric acid output | Low | High | Normal |
| Number of tumours | Multiple | Multiple | Single |
| Size of tumors | <1 cm | <1 cm | 2–5 cm |
| Site of tumors | Fundus | Fundus (occasionally antrum) | Fundus or antrum |
| Metastasis | 2–5% | <10% | >50% |
| Mean age at diagnosis | 63 | 50 | 55 |
| Prognosis | Good | Usually good—a minority of tumors are more aggressive | Poor |
|