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RecruitingLast updated: 23 April 2026

PSMAcTION: A new treatment called AAA817 compared to standard treatment for people with PSMA-positive metastatic castration-resistant prostate cancer (mCRPC) who have had prior treatmetnA Phase II/III, Open-label, International, Multicenter, Randomized Study of AAA817 Versus Standard of Care in the Treatment of Adult Participants With PSMA Positive Metastatic Castration-resistant Prostate Cancer Who Progressed on or After [177Lu]Lu-PSMA Targeted Therapy

Trial purpose

Medical clipboardCancer treatment

Tumor type

Urinary System Cancers Genitourinary

Age

People18 - 100

Trial acronym

PSMAcTION

Clinical summary

Summary

This study has two parts.

Part 1
This part of the study is designed to gather more information about the right dose of the study treatment, called AAA817. The goal is to confirm that the dose planned for the next part of the study is appropriate before moving forward.

Part 2
Participants will be randomly assigned (by chance) to receive either AAA817 or the doctor's choice of standard treatment. The purpose of this part is to see how safe AAA817 is and how well it works compared to standard treatment.

Who can take part?
The study is for adults with advanced prostate cancer that:

  • Has spread to other parts of the body
  • is PSMA-positive
  • Has continued to grow despite hormone treatment
  • Has already been treated with newer hormone therapies (ARPI), chemotehrapy (taxanes), and Lu-PSMA targeted therapy

Conditions

This trial is treating people with metastatic castration-resistant prostate cancer that is PSMA-positive

Eligibility

Inclusion

  • adults ≥ 18 years of age.
  • ECOG performance status of 0 to 2.
  • histopathological and/or cytological confirmation of adenocarcinoma of the prostate.
  • PSMA-positive disease as assessed by PSMA PET/CT scan using an approved PSMA imaging agent as protocol instructed,
  • castrate level of serum/plasma testosterone (< 50 ng/dL or < 1.7 nmol/L).
  • Prior treatments with an androgen receptor pathway inhibitor (ARPI) and taxane-based chemotherapy, and progressed on or after [177Lu]Lu-PSMA targeted therapy.
  • ≥ 1 metastatic lesion that is present on screening/baseline CT, MRI, or bone scan imaging obtained ≤ 28 days prior to randomization
  • eGFR as requested by the sponsor

Exclusion

  • Any investigational agents within 28 days prior to the day of randomization.
  • Any 225Ac-based investigational compound used prior to the day of randomization.
  • Participants with a history of CNS metastases who are neurologically unstable, symptomatic, or receiving corticosteroids for the purpose of maintaining neurologic integrity.
  • Concurrent acute kidney injury (renal failure developed between 48 hours to 7 days) or chronic kidney disease (at least 3 months of ongoing renal injury)
  • Baseline xerostomia ≥ Grade 2 by CTCAE v.5
  • History of uncontrolled hypertension, myocardial infarction (MI), angina pectoris, or coronary artery bypass graft (CABG) within 6 months prior to ICF signature and/or clinically active significant cardiac disease
  • History of lymphoproliferative disease or any known malignancy or history of malignancy of any organ system within the past 5 years (except for basal cell carcinoma or actinic keratosis that have been treated with no evidence of recurrence in the past 3 months, non-invasive malignant colon polyps that have been removed).

Other protocol-defined inclusion/exclusion criteria may apply.

Inclusion

  • Your cancer has spread to other parts of the body (metastatic) or has grown into nearby parts of the body (locally advanced).
  • You have had treatment but your cancer has gotten worse or has not responded to the treatment you have been given.
  • You have had a certain type of treatment or surgical procedure.

Exclusion

  • You have certain types of non-cancer medical conditions.
  • You have had certain treatments, surgical procedures or drugs.
Message

Clinical trials have complex eligibility criteria, and other criteria may apply for this trial. Ask your doctor about whether this trial could be right for you.

Participating hospitals

Recruiting hospitals

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More information

Trial Identifiers

Information on this page is partially produced from ClinicalTrials.gov, EU Clinical Trials Register *. View further details about this trial on the registry via the links below:

Trial sponsor

Novartis Pharmaceuticals

Scientific Title

A Phase II/III, Open-label, International, Multicenter, Randomized Study of AAA817 Versus Standard of Care in the Treatment of Adult Participants With PSMA Positive Metastatic Castration-resistant Prostate Cancer Who Progressed on or After [177Lu]Lu-PSMA Targeted Therapy

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