Ultrasound-Guided Microbubble-Assisted Delivery of Radiopharmaceutical Agents for Gastric Tumor Control

Area of Science:

• Oncology
• Radiopharmaceutical Therapy
• Medical Imaging & Diagnostics

Background:

• Radiopharmaceutical therapy for gastric cancer faces challenges with tumor penetration and off-target effects.
• Ultrasound-guided microbubble delivery can noninvasively enhance vascular permeability and radiopharmaceutical uptake.

Purpose of the Study:

• To develop and evaluate an ultrasound-guided microbubble system for improved gastric cancer radiopharmaceutical delivery.
• To enhance intratumoral radiopharmaceutical accumulation, therapeutic efficacy, and safety.

Main Methods:

• Developed ligand-functionalized, radiopharmaceutical-loaded microbubbles for intravenous administration.
• Utilized real-time ultrasound imaging and focused ultrasound for controlled microbubble cavitation.
• Assessed biodistribution via PET imaging, tumor growth via ultrasound, and therapeutic response via histopathology and TUNEL assays.

Main Results:

• Microbubble activation significantly increased intratumoral uptake (8.4%ID/g vs. 3.0%ID/g).
• Tumor-to-background ratios improved 2.6-fold, leading to a 58% decrease in tumor volume.
• Apoptotic indices increased significantly, while off-target organ uptake remained low (<2.0% ID/g).

Conclusions:

• Ultrasound-guided microbubble administration enhances tumor-specific radiopharmaceutical absorption in gastric cancer.
• This method effectively slows tumor development and reduces systemic radiation exposure.
• The approach shows promise as an improved therapeutic strategy for gastric cancer.