Review Article
Current Concepts on Gastric Carcinoid Tumors
Table 2
Characteristics of gastric carcinoid tumors.
| | 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 |
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