An injectable ionic hydrogel inducing high temperature hyperthermia for microwave tumor ablation.

Area of Science:

• Biomaterials Science
• Oncology
• Medical Physics

Background:

• Microwave tumor ablation is a promising minimally invasive cancer therapy.
• Optimization of susceptible agents is crucial for effective microwave ablation.
• Current agents face challenges in efficacy and stability.

Purpose of the Study:

• To develop and evaluate a novel chitosan-based ionic hydrogel as a susceptible agent for microwave tumor ablation.
• To investigate the hydrogel's ability to induce hyperthermia and its in vivo performance.
• To elucidate the microwave heating mechanism through computer simulation.

Main Methods:

• Synthesis of a novel chitosan-based ionic hydrogel.
• Evaluation of hydrogel properties: porosity, ion confinement, and thermal generation under microwave exposure.
• In vivo assessment of bio-toxicity, spatial stability, and anti-tumor efficacy in a repeated microwave thermal therapy model.
• Computer simulation to understand microwave heating mechanisms.

Main Results:

• The synthesized hydrogel exhibits high porosity and strong ion confinement, leading to rapid heat generation via polarization under microwave exposure.
• The hydrogel demonstrated negligible bio-toxicity and excellent spatial stability in vivo.
• Repeated microwave thermal therapy using the hydrogel achieved excellent therapeutic efficiency at low power density (2.0 W, 2.45 GHz).
• Computer simulations provided insights into the microwave heating mechanism.

Conclusions:

• The developed chitosan-based ionic hydrogel is a biocompatible and stable agent for microwave tumor ablation.
• This novel hydrogel shows significant potential for clinical application in cancer therapy.
• The study highlights the importance of agent optimization for enhancing microwave ablation efficacy.