Radium 223 dichloride (
223Ra) is a bone-targeting radionucleotide that emits high-energy alpha particles over a short range (<100 μm). The alpha particles induce double-stranded DNA breaks in adjacent tumor cells without a significant bystander effect in normal tissue
9. Notably, data from the ALSYMPCA phase 3 trial (NCT00699751) demonstrated that treatment with
223Ra results in increased OS in patients with mCRPC and symptomatic bone metastases
9.
223Ra was approved for treatment of mCRPC in China in August 2020 based on the results of a multi-center, phase 3 trial (NCT01810770)
10. Because use of
223Ra is limited by the lack of efficacy for visceral metastases, combinations with other systemic treatments are currently under development.
223Ra plus enzalutamide has recently been reported to improve rPFS in patients with mCRPC and bone metastases in the ongoing phase 3 PEACE trial (NCT02194842)
11. The clinical application of
223Ra in China is limited by several factors, including the high costs of manufacturing and importation, because alpha-emitting drugs cannot be made in China and must be imported. Widespread use of
223Ra in China is also restricted by a shortage of nuclear medicine specialists and hospitals within which the treatment can be performed, as well as the close multi-disciplinary cooperation that is required. Limited patient acceptance is another limiting factor to the clinical application of
223Ra in China, resulting from a lack of information surrounding this new approach.