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Actinium Pharmaceuticals initiates study of HER3 targeted radiotherapy in prostate cancer

Actinium Pharmaceuticals initiates study of HER3 targeted radiotherapy in prostate cancer
Actinium starts ATNM-400 trial

Actinium Pharmaceuticals announced the commencement of its first in human Phase 1 trial evaluating ATNM-400, a HER3 targeted, non PSMA radiotherapy, in patients with metastatic castration resistant prostate cancer.

The update was shared during the ESMO2026 conference in Madrid. The study marks a step forward in exploring new treatment options for advanced prostate cancer using innovative radiotherapy approaches.

Actinium previously delivered new updates on the clinical and preclinical progress of ATNM-400 in major cancer indications, as reported here. The company also presented preclinical efficacy data for ATNM-400 in lung, colorectal, and ovarian cancer at EANM26 in Vienna, detailed here. These developments highlight Actinium's continued focus on expanding the potential applications of ATNM-400.

This material may contain third-party opinions, none of the data and information on this webpage constitutes investment advice according to our Disclaimer. While we adhere to strict Editorial Integrity, this post may contain references to products from our partners.

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