A Study of [225Ac]Ac-AKY-2519 in Patients With Metastatic Castration-Resistant Prostate Cancer
BActinium-1: A Phase 1b, Multicenter, Open-label Study to Evaluate the Safety and Efficacy of Intravenous Administration of B7-H3 Radiopharmaceutical ([225Ac]Ac-AKY-2519) in Metastatic Castration-Resistant Prostate Cancer
Aktis Oncology, Inc.
138 participants
Jul 1, 2026
INTERVENTIONAL
Conditions
Summary
This is a Phase 1b, multi-center, open-label study to evaluate the safety, tolerability, dosimetry, and pharmacokinetics (PK) of \[64Cu\]Cu-AKY-2519 and/or \[225Ac\]Ac-AKY-2519, as well as the preliminary anti-tumor activity of \[225Ac\]Ac-AKY-2519 in participants with metastatic castration-resistant prostate cancer (mCRPC) with and without prior exposure to 177Lu-PSMA-617 (PLUVICTO™).
Eligibility
Inclusion Criteria9
- Age ≥ 18 years
- Histologic or cytologic confirmation of prostatic adenocarcinoma
- ECOG Performance Status of 0 or 1
- Adequate end-organ function
- Ability to give informed consent and comply with study requirements
- Patients with CNS metastases are eligible if they have received therapy and are neurologically stable, asymptomatic and not receiving corticosteroids
- Castrate levels of serum testosterone (< 50 ng/dL)
- Documented disease progression on most recent prior line of therapy, either by PSA or imaging-based progression
- Cohort B: Received 2 or more prior doses of 177Lu-PSMA-617 (PLUVICTO)
Exclusion Criteria7
- Prior treatment with more than 2 Androgen receptor pathway inhibitors (ARPIs) and/or more than 1 taxane-based therapy in the mCRPC setting
- Prior treatment with a targeted radiotherapy
- o Exception: Cohort B is required to have had at least 2 prior doses of 177Lu-PSMA-617 (PLUVICTO)
- Prior treatment with a B7-H3 targeted therapy
- Received an investigational agent within the previous 28 days
- Impaired cardiac function or clinically significant cardiac disease
- Concurrent serious medical condition that would impair study participation or impact the assessment of treatment related toxicity
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Interventions
\[225Ac\]Ac-AKY-2519 Injection
\[64Cu\]Cu-AKY-2519 Injection
Locations(2)
View Full Details on ClinicalTrials.gov
For the most up-to-date information, visit the official listing.
NCT07581184