“…While considerable efforts have been devoted to the development of new magic bullets, none have received approval by the FDA (other than 131 I-sodium iodide) for routine use as therapeutic radiopharmaceuticals. Significant advances have been made over the past decade in the development of promising radiolabeled agents that have been shown to be effective for treatment of human cancers. ,,,,, As a result of these efforts, several new therapeutic radiopharmaceuticals that selectively target cancer cells in vivo are being evaluated in FDA-approved phase II and III clinical trials.…”