Abstract
Radium-223 dichloride (Ra-223) is the first targeted alpha therapy approved for the treatment of patients with castration-resistant prostate cancer (CRPC) with bone metastasis. Ra-223 improved overall survival in the international Phase III ALSYMPCA (ALpharadin in SYMPtomatic Prostate Cancer) study. Ra-223 was also demonstrated to be efficacious and safe in Japanese patients in Phase I and Phase II clinical trials. Ra-223 was approved in Japan for the treatment of patients with CRPC with bone metastasis in 2016. The conduct of clinical studies with radionuclides in Japan involves mandatory compliance with local and international regulations pertaining to radiation protection. Without an existing Japanese framework for the handling of α-emitters in clinical practice, we encountered many challenges to initiate the clinical studies. Therefore, we started on a project to determine best practice on the use of Ra-223 in clinical studies. For this project, we evaluated all applicable laws and regulations on the use of radionuclides in medicine, then examined whether and how the α-emitter Ra-223 could meet these legal and regulatory requirements. This included how to approach the matter of discharging patients administered Ra-223 from hospital and radiation protection for caregivers, general public and medical care professionals. Subsequently, we published Manual on the proper use of radium-223 dichloride injection in clinical trials that summarized the essential requirements necessary to allow the safe use of Ra-223 in clinical trials in Japan. As the result, we succeeded in demonstrating that clinical trials of an α-emitter, Ra-223, could be implemented safely in Japan. Our experience in Japan highlights the importance of a multidisciplinary team-based approach and continued professional training in a clinical setting. This article summarizes the rationale behind the development of this manual. We hope that by sharing our experience and information, we can help other countries considering the introduction of radionuclides for clinical use, and support the future development of radionuclide therapies in a safe and effective manner.
Highlights
Radium-223 dichloride (Ra-223) is a targeted α-emitting agent used to treat bone metastasis associated with prostate cancer
Ra-223 was approved in Japan for the treatment of patients with castration-resistant prostate cancer (CRPC) with bone metastasis in 2016
The use of radionuclides has become more prevalent, with the development of agents labeled with iodine-131, yttrium-90, and lutetium-177 [21]
Summary
Radium-223 dichloride (Ra-223) is a targeted α-emitting agent used to treat bone metastasis associated with prostate cancer. Measurement at locations with a high risk of radiation hazards and strage of records Radiation exposure and radioactive surface contamination levels must be measured at certain locations related to the use of the radionuclide before starting treatment and no later than 1 month after starting treatment (6 months for some locations) These locations include rooms where the radionuclide is used, the outside walls of these rooms, storage and waste management facilities for medical waste (including drainage appliances), boundaries of controlled areas, areas that might be accessed by treated patients, isolation rooms, and site boundaries. When the level of radioactivity is confirmed to be equal to background radiation, the radioactive medical waste can be removed from the facility
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