GAST and gastritis: Gastric carcinoid tumors are now classified into three subtypes by some [58,59] and into four subtypes by others [60], including: Type 1 gastric carcinoids, which are sporadic in nature, gastrin-dependent, well-differentiated, arise in chronic hypergastrinemic states such as chronic atrophic gastritis/pernicious anemia, comprise 70–80% of all gastric carcinoids, and metastasize in <10% [58,59,60].