Image-Guided Intraductal Ablative Procedure for Primary Prevention of Breast Cancer

This project describes the development and demonstration of an image-guided intraductal ethanol-based ablative procedure intended as a minimally invasive primary prevention strategy for breast cancer. Motivated by the limited primary prevention options currently available most notably prophylactic mastectomy, which removes mammary epithelial cells but is a major, life-altering surgery the work outlines a translational pathway for local chemical ablation that could preferentially eliminate the epithelial cells that give rise to breast cancer while preserving surrounding tissue. Building on prior mouse-model studies, the team scaled the approach to rat models, whose larger and denser ductal trees present a more clinically relevant architecture. The protocol uses intraductal cannulation through the nipple opening to infuse a 70% ethanol-based ablative solution formulated with tantalum oxide nanoparticles as an X-ray contrast agent and ethyl cellulose as a gelling agent.

The inclusion of a radiopaque nanoparticle contrast enables real-time fluoroscopic ductography and high-resolution microCT imaging to confirm complete ductal tree filling an essential requirement to ensure all mammary epithelial cells have been exposed to the ablative agent. The procedure emphasizes formulation considerations to minimize local and systemic side effects, and methodological adaptations unique to delivering an ablative solution rather than simple aqueous reagents. The protocol details steps for reliable delivery into each mammary gland across weekly sessions, and highlights how image-guided assessment techniques are used to determine success, extent of filling, and potential off-target spread. Ethanol (EtOH) was selected because of its established clinical use as an ablative or sclerosing agent in multiple contexts and its favorable safety profile; previous work in mouse models demonstrated effective chemical ablation of mammary epithelial cells with limited collateral damage and prevention of tumor formation. Translational feasibility is a central consideration: the authors point out that ductal delivery and image-guided visualization methods have analogues in existing clinical procedures, suggesting potential for near-term adaptation to human clinical trials if safety and efficacy are demonstrated.

The rat model serves as an intermediate step in proof-of-concept studies, offering a larger ductal tree and more complex stromal environment compared with mice, enabling assessment of scalability and procedural reproducibility. Overall, this work presents a carefully considered, image-guided intraductal ablative approach that seeks to provide a less invasive alternative to prophylactic mastectomy for high-risk individuals. By combining a clinically familiar ablative agent with radiopaque contrast and established imaging modalities, and by documenting procedural techniques to maximize ductal filling while minimizing side effects, the study provides a methodological foundation for further preclinical evaluation and eventual clinical translation of intraductal chemical ablation as a new primary prevention option for breast cancer.