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Updated: May 26, 2026
08:34
Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
Published on: February 6, 2019
An overview of targeted alpha therapy
Young-Seung Kim1, Martin W Brechbiel
1Radioimmune & Inorganic Chemistry Section, Radiation Oncology Branch, NCI, NIH, 10 Center Drive, Building 10, Rm B3B69, Bethesda, MD 20892-1002, USA.
Summary
Targeted alpha-therapy (TAT) uses alpha particles for precise tumor cell killing. Despite challenges like cost and availability, TAT shows promise for treating small tumors and micrometastatic disease.
Area of Science:
- Nuclear medicine
- Radiochemistry
- Oncology
Background:
- Alpha particles, helium nuclei, deliver high energy over short distances (~50-100 microm).
- High linear energy transfer (LET) of alpha particles enables specific tumor cell killing with minimal damage to surrounding tissues.
- Alpha emitters like (225)Ac, (211)At, (212)Bi, (213)Bi, (212)Pb, (223)Ra, and (227)Th are effective for small tumor burdens and micrometastatic disease.
Purpose of the Study:
- To review the properties of alpha particles and their application in targeted alpha-therapy (TAT).
- To discuss the limitations hindering the development of TAT.
- To suggest future directions for improving TAT efficacy and accessibility.
Main Methods:
- Review of pre-clinical and clinical trial data on alpha emitters.
- Analysis of alpha particle properties (size, energy deposition, LET).
- Identification of challenges in radionuclide production, chemistry, and delivery.
Main Results:
- Alpha particles offer superior tumor-specific cytotoxicity compared to beta-emitters due to their physical characteristics.
- TAT has demonstrated effectiveness in treating micrometastatic and disseminated cancers.
- Significant limitations include high costs, complex chemistry, and limited availability of suitable radionuclides.
Conclusions:
- Further research is needed to address limitations in isotope production, chemistry, and delivery systems for TAT.
- Development of more potent isotopes, improved chelation and labeling techniques, and enhanced targeting strategies are crucial.
- Identifying appropriate clinical applications and optimizing isotope production are key to advancing TAT.
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