Comparative Pharmacology
Head-to-head clinical analysis: METASTRON versus SODIUM CHROMATE CR 51.
Peer-Reviewed Evidence
Head-to-head clinical analysis: METASTRON versus SODIUM CHROMATE CR 51.
METASTRON vs SODIUM CHROMATE CR 51
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Strontium-89 chloride is a bone-seeking radiopharmaceutical that emits beta radiation. After intravenous administration, it is taken up preferentially by osteoblastic bone metastases, where its beta decay causes DNA damage and cell death in tumor cells.
Radiolabeled sodium chromate (51Cr) binds to red blood cells, tagging them for survival studies. 51Cr emits gamma radiation, allowing detection and quantification of RBC mass and survival via scintillation counting or imaging.
Metastron (strontium-89 chloride) is administered intravenously at a dose of 148 MBq (4 mCi) as a single injection.
Intravenous injection, 5-30 microcuries (0.185-1.11 MBq) as a single dose.
None Documented
None Documented
Terminal elimination half-life is approximately 50.5 days (range 20-87 days). Clinical context: due to prolonged retention in bone metastases, radiobiological half-life exceeds physical half-life; therapeutic effect persists for weeks despite declining plasma levels.
The biological half-life is approximately 27–30 days. Clinically, gradual clearance from blood and tissues occurs over weeks to months.
Renal excretion of strontium-89; approximately 70% excreted in urine within 48 hours, with the remainder eliminated over weeks via both renal and fecal routes (12-20% fecal).
Primarily renal. Approximately 90% of absorbed dose is excreted in urine within 48 hours. Fecal excretion accounts for less than 5%.
Category C
Category C
Radiopharmaceutical
Radiopharmaceutical