They have been classified according to their relation to states of hypergastrinemia or based on chronic atrophic gastritis. When chronic atrophic gastritis is present, with or without pernicious anemia, NETs are classified as type I. When NETS are associated with Zollinger Ellison syndrome, or are combined with type 1 multiple endocrine neoplasias MENs, they are classified as type II. Sporadic forms are grouped together as type III Figure 1.
Se han estratificado según estén relacionados con estados de hipergastrinemia o con un fondo de gastritis crónica atrófica GCA con o sin anemia perniciosa tipo I, asociados al síndrome de Zollinger Ellison ZE, o en combinación con las neoplasias endocrinas múltiples NEM tipo 1 tipo II, o las formas esporádicas tipo III figura 1.