Boron distribution analysis by alpha-autoradiography.

Area of Science:

• Biomedical research
• Radiochemistry
• Oncology

Background:

• Boron neutron capture therapy (BNCT) is a binary treatment modality.
• The boron-10 (10B) compound, Na2 10B12H11SH, is clinically used for BNCT of brain tumors.

Purpose of the Study:

• To investigate the topographic and quantitative distribution of Na2 10B12H11SH in rat brains with tumors.
• To assess the potential of this 10B compound for brain tumor treatment.

Main Methods:

• Utilized neutron-induced alpha-autoradiography for 10B distribution analysis.
• Employed Sprague-Dawley rats with transplanted intracerebral tumors.
• Quantified 10B concentration in normal brain tissue, tumors, and blood.

Main Results:

• Minimal 10B (<1 µg/cm³) was detected in normal brain parenchyma, excluding specific areas.
• Significant accumulation of 10B was observed in transplanted brain tumors.
• The tumor-to-blood 10B concentration ratio reached 1 at 12 hours post-injection.
• Tumor 10B concentration reached 18 µg/cm³ at 12 hours.

Conclusions:

• The 10B compound demonstrates selective accumulation in brain tumors.
• Achieved tumor concentrations and tumor-to-blood ratios support the efficacy of BNCT for brain tumors.
• This study validates the use of Na2 10B12H11SH in BNCT for brain tumor treatment.