Abstract Many cancers of neuroendocrine origin overexpress cholecystokinin-2 receptors (CCK-2R) including medullary thyroid cancer, small cell lung cancer and other carcinoids. Fluorine-18 labelled peptides targeting CCK-2R enable direct visualization quantification this receptor in vivo using positron emission tomography imaging. CP04 1 MG11 2 are two previously described truncated derived fro...