Enhancing tumor's skin photothermal therapy using Gold nanoparticles : a Monte Carlo simulation

Area of Science:

• Biomedical Optics
• Nanotechnology
• Photothermal Therapy

Background:

• Gold nanoparticles (GNPs) offer unique optical properties for biomedical applications.
• Targeted hyperthermia is a promising cancer treatment modality.
• Optimizing light absorption in tumors is crucial for effective photothermal therapy.

Purpose of the Study:

• To investigate the impact of Gold nanoparticles (GNPs) on laser light absorption within skin tumors.
• To evaluate the potential of GNPs for enhancing photothermal effects in tumors.
• To assess the safety profile of GNP-enhanced laser treatment for surrounding healthy tissue.

Main Methods:

• Utilized Monte Carlo Geant4 simulations to model human skin with implanted tumor spheroids.
• Simulated multicolor laser exposure across the 900 nm to 1200 nm wavelength range.
• Investigated the effect of a 0.01% GNP concentration on laser absorption and temperature increase.

Main Results:

• A 0.01% GNP concentration in tumors significantly increased laser absorption by up to 25%.
• Tumor temperature rose by approximately 20% due to enhanced absorption, particularly at 900-1200 nm.
• Simulations indicated selective heating of GNP-loaded tumors, preserving healthy tissue.

Conclusions:

• Low concentrations of Gold nanoparticles effectively enhance laser absorption in skin tumors.
• GNP-mediated photothermal effects offer a promising strategy for targeted tumor ablation.
• This approach demonstrates potential for selective cancer cell death with minimal damage to adjacent healthy tissues.