
Actinium Pharmaceuticals Unveils Preclinical Data Showing ATNM-400 Overcomes Breast Cancer Therapy Resistance

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Actinium Pharmaceuticals Inc. announced preclinical data for ATNM-400, an Actinium-225 antibody radioconjugate, showing significant anti-tumor activity in breast cancer models resistant to standard therapies. The data suggest ATNM-400 may overcome resistance to endocrine and HER2-targeted therapies and inhibit tumor growth in TNBC models. Results will be presented at the San Antonio Breast Cancer Symposium on December 11, 2025.
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