Can Actinium’s ATNM-400 radiotherapy reshape treatment for resistant breast cancer?
Actinium Pharmaceuticals, Inc. has presented new preclinical data for its alpha-particle radiotherapy candidate ATNM-400 at the 2025 San Antonio Breast Cancer Symposium (SABCS), highlighting potent anti-tumor activity across hormone receptor–positive, triple-negative, and therapy-resistant breast cancer models. The findings suggest that ATNM-400 could become a differentiated treatment option for patients with tumors that have progressed after