Neutron-activatable needles for radionuclide therapy of solid tumors

Area of Science:

• Biomedical Engineering
• Materials Science
• Nuclear Medicine

Background:

• Delivering therapeutic agents, like radionuclides, to solid tumors remains a challenge.
• Current methods for internal radiation therapy require careful handling of radioactive materials.

Purpose of the Study:

• To develop and characterize novel neutron-activatable microneedles for targeted internal radiation therapy of solid tumors.
• To create a system for producing radioactive needles with minimal direct handling of radioactivity.

Main Methods:

• Conical needles made of Titanium (Ti) and Molybdenum (Mo) were coated with Holmium (Ho) and Rhenium (Re) using pulsed laser deposition or chemical vapor deposition.
• Needles were designed based on transdermal microneedle arrays.
• Neutron activation was used to generate radioactive isotopes.
• Neutron-absorbing shields were employed to prevent unwanted radionuclide production.
• Stability studies assessed the leaching of Rhenium (Re) from Molybdenum (Mo) needles.

Main Results:

• Radioactive needles were successfully prepared, yielding therapeutic radionuclides after neutron irradiation.
• Neutron activation calculations confirmed the production of therapeutically significant radionuclide amounts.
• Stability studies showed no leaching of Rhenium (Re) from the Molybdenum (Mo) needles.
• The design allows for precise control over radiation dose by adjusting coating thickness and irradiation time.

Conclusions:

• Coated neutron-activatable needles offer a promising new method for internal radiation therapy.
• This approach enables precise tailoring of radiation dose delivery to tumors.
• The microneedle design facilitates safe production and targeted delivery of therapeutic radionuclides.