The highest concentrations of CgA have been found in patients with gastric and lung NETs, while the highest median values of CgA have been found in patients with tumors of the small intestine, colon, and pancreas (about 12, 11, and 8 times higher than in the controls, respectively), especially in the case of patients with liver metastases and carcinoid syndrome [44]. The gene discussed is CGA; the disease is neoplasm.