NCIt definition : An synthetic compound containing the organic phosphonate hydroxyethylidene diphosphonate
(HEDP) labeled with the radioisotope rhenium Re 186. Re-186 etidronate binds to hydroxyapatite
in bone, delivering a cytotoxic dose of beta radiation to primary and metastatic bone
tumors. Re-186 is a beta emitter with a short half-life, a radioisotope profile that
provides localized antitumor radiocytotoxicity while sparing extramedullary bone marrow
tissues.;