Pronunciation: (suh-MAYR-ee-um ...)
A radioactive substance used in the treatment of bone cancer and bone metastases (cancers that have spread from the original tumor to the bone). Samarium 153 is a radioactive form of the element samarium. It collects in bone, where it releases radiation that may kill cancer cells. It is a type of radioisotope.
Source: NCI Dictionary of Cancer TermsDate last modified: 2008-07-15