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NCI Dictionary of Cancer Terms

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iobenguane I 131  listen  (I-oh-BEN-gwayn …)

  A drug used to find or treat certain types of tumors, including pheochromocytomas and neuroblastomas. It is also used to relieve pain caused by cancer that has spread to the bones. It is made of a substance called iobenguane linked to a radioactive substance called iodine I 131. The radiation from iodine I 131 may help kill cancer cells or show where they are in the body. Iobenguane I 131 is a type of radioimaging agent and a type of radioconjugate. Also called 131I-MIBG and iodine I 131 metaiodobenzylguanidine.