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NCI Dictionary of Cancer Terms

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NCI Dictionary of Cancer Terms



samarium 153  listen  (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.