Alpha-emitters are radionuclides that decay through the emission of high linear energy transfer alpha-particles and possess favorable pharmacologic profiles for cancer treatment. When coupled with monoclonal antibodies, peptides, small molecules, or nanoparticles, the excellent cytotoxic capability of alpha-particle emissions has generated a strong interest in exploring targeted alpha-therapy in the pre-clinical setting and more recently in clinical trials in oncology. Multiple obstacles have been overcome by researchers and clinicians to accelerate the development of targeted alpha-therapies, especially with the recent improvement in isotope production and purification, but also with the development of innovative strategies for optimized targeting. Numerous studies have demonstrated the in vitro and in vivo efficacy of the targeted alpha-therapy. Radium-223 (Ra-223) dichloride (XofigoA (R)) is the first alpha-emitter to have received FDA approval for the treatment of prostate cancer with metastatic bone lesions. There is a significant increase in the number of clinical trials in oncology using several radionuclides such as Actinium-225 (Ac-225), Bismuth-213 (Bi-213), Lead-212 (Pb-212), Astatine (At-211) or Radium-223 (Ra-223) assessing their safety and preliminary activity. This review will cover their therapeutic application as well as summarize the investigations that provide the foundation for further clinical development.
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