title: Iodine-131-labeled diphosphonates for palliative treatment of bone metastases: II. Preliminary clinical results with iodine-131 BDP3.
abstract: The kinetics, dosimetry, and response of iodine-131 alpha-amino-(4-hydroxybenzylidene)-diphosphonate ([131I]BDP3) treatment were investigated with patients who had pain symptoms from bone metastases of various primary carcinoma. The blood clearance of [131I]BDP3 was rapid. More than 90% disappeared from the blood pool at 2 hr after injection. The excretion of the activity occurred solely through the kidneys and mean total-body retention at 48 hr was 48.6%. The urinary activity showed a metabolite which must be formed by an in vivo cleavage reaction of a phosphorus-carbon bond. The uptake of in vivo cleaved [131I]iodide in the unblocked thyroid was approximately 0.5%. The effective half-life of [131I]BDP3 in metastatic bone (median 182 hr; range 177-205 hr) proved to be longer than in unaffected areas (145 hr; 140-165 hr). Palliative therapies were performed with 18 patients. They received doses ranging between 6 and 48 mCi [131I]BDP3. The response was 44% complete pain relief, 6% substantial pain relief, 22% minimal improvement, and 28% no change. The duration of response ranged between 1 and 8 wk.
mesh_terms: D001597:Benzylidene Compounds; D001859:Bone Neoplasms / Q000000981:diagnostic imaging / Q000532:radiotherapy / Q000556:secondary*; D001842:Bone and Bones / Q000000981:diagnostic imaging / Q000378:metabolism; D004164:Diphosphonates; D005260:Female; D006207:Half-Life; D006801:Humans; D007457:Iodine Radioisotopes / Q000627:therapeutic use*; D007700:Kinetics; D008297:Male; D059408:Pain Management; D010166:Palliative Care / Q000379:methods*; D011877:Radionuclide Imaging; D011879:Radiotherapy Dosage
chemical_list: D001597:Benzylidene Compounds; D004164:Diphosphonates; D007457:Iodine Radioisotopes; C043715:alpha-amino-(4-hydroxybenzylidene)diphosphonate