| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Neuroendocrine tumor grade 1 | Is a | False | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier |  | 
| Neuroendocrine tumor grade 2 | Is a | False | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier |  | 
| Neuroendocrine carcinoma, grade 3 | Is a | False | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier |  | 
| Enterochromaffin-like cell tumor, malignant | Is a | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier |  | 
| Medullary carcinoma with amyloid stroma | Is a | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier |  | 
| Goblet cell carcinoid | Is a | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier |  | 
| Medullary carcinoma | Is a | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier |  | 
| Enterochromaffin cell carcinoid | Is a | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier |  | 
| Merkel cell carcinoma | Is a | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier |  | 
| Composite carcinoid | Is a | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier |  | 
| Neuroendocrine tumor | Is a | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier |  | 
| Islet cell carcinoma | Is a | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier |  | 
| Oat cell carcinoma | Is a | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier |  | 
| Adenocarcinoid tumor | Is a | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier |  | 
| Malignant neuroendocrine tumor | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Small cell neuroendocrine carcinoma | Is a | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier |  | 
| Primary malignant neuroendocrine neoplasm of stomach | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of cardia of stomach | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of body of stomach | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of pyloric antrum of stomach | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of colon | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of rectum | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of duodenum | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of small intestine | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of esophagus | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of appendix | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of bronchus | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of lung | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of anus | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of anal canal | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of cystic duct | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of distal bile duct | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of ampulla of Vater | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of biliary tract | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of pancreas | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of jejunum | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of ileum | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neuroendocrine neoplasm of perihilar bile duct | Associated morphology | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier | 1 | 
| Mixed neuroendocrine-non neuroendocrine neoplasm | Is a | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier |  | 
| Carcinoid bronchial adenoma | Is a | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier |  | 
| Pancreatic endocrine tumor, nonfunctioning | Is a | True | Malignant neuroendocrine neoplasm, epithelial | Inferred relationship | Existential restriction modifier |  |