Molecular pathways: targeted α-particle radiation therapy.

Area of Science:

• Oncology
• Radiation Oncology
• Molecular Biology

Background:

• Alpha-particle radiation, a Helium-4 nucleus, offers high cytotoxicity with limited tissue penetration.
• Targeted alpha-therapy (TAT) leverages this property for precise cancer cell targeting, minimizing normal tissue effects.
• Despite clinical interest and trials, the precise molecular mechanisms of TAT-induced DNA damage and cellular response remain incompletely understood.

Purpose of the Study:

• To provide an overview of the current understanding of molecular pathways involved in DNA damage response and repair following targeted alpha-therapy.
• To highlight the clinical translation status of TAT and other alpha-emitter radionuclide therapies.

Main Methods:

• Review of existing literature on high linear energy transfer (LET) radiation effects.
• Analysis of molecular pathways implicated in DNA damage and repair.
• Summary of clinical trial data and translation of alpha-emitter therapies.

Main Results:

• High LET alpha-radiation causes significant DNA damage, primarily double-strand breaks.
• Cellular responses involve complex pathways for DNA repair and cell fate determination.
• Several alpha-emitters, including (225)Ac, (211)At, (213)Bi, (212)Pb, and (223)Ra, are in clinical development or use.

Conclusions:

• TAT presents a promising therapeutic strategy for various cancers, especially minimal or compartmentalized disease.
• Further elucidation of molecular mechanisms is crucial for optimizing TAT efficacy and safety.
• Clinical translation of TAT and related alpha-emitter therapies is advancing globally.