What is a pentetreotide scan and what is it used for?
A pentetreotide scan (sometimes referred to as an octreotide scan or an OctreoScan™, utilizes the radiotracer indium-111 ( 111 In) pentetreotide, which binds to neuroendocrine tumors that express somatostatin receptors.
Typically, patients are injected on the first day and imaged at 24 hours post injection. The most common tumors for which pentetreotide scans can be useful include carcinoid tumor, islet cell tumors (particularly gastrinomas, glucagonomas, and VIPomas), small cell lung cancer, pheochromocytoma, paraganglioma, pituitary adenoma, and medullary thyroid cancer. It should be noted that pentetreotide scans are not particularly useful for insulinomas.