| Gastroenteropancreatic NETs |
| Gastrointestinal tract (carcinoid tumors) |
| Pancreatic NETs (islet cell tumors*) |
| Endocrine disease |
| Hyperparathyroidism |
| Hyperthyroidism |
| Pheochromocytoma |
| Pituitary tumors |
| Medullary thyroid carcinoma |
| Gastrointestinal disorders |
| Chronic atrophic gastritis |
| Chronic hepatitis |
| Colon cancer |
| Hepatocellular carcinoma |
| Inflammatory bowel disease |
| Irritable bowel syndrome |
| Liver cirrhosis |
| Pancreatic adenocarcinoma |
| Pancreatitis |
| Cardiovascular disease |
| Acute coronary syndrome |
| Arterial hypertension |
| Cardiac insufficiency/failure |
| Essential hypertension |
| Giant cell arteritis |
| Drugs |
| Proton pump inhibitors |
| Histamine-2 receptor antagonists |
| Inflammatory disease |
| Airway obstruction in smokers |
| Chronic bronchitis |
| Systemic rheumatoid arthritis |
| Systemic inflammatory response syndrome |
| Renal disorders |
| Renal insufficiency/failure |
| Non-gastrointestinal cancers |
| Breast cancer |
| Ovarian cancer |
| Prostate cancer¶ |
| Small cell lung cancer |
| Neuroblastoma |
