AMO959

Clinical trials are investigating AMO959 in adults with PSMA-positive prostate cancer that has spread to other parts of the body. These studies aim to understand safety, tolerability, dose limits, and early signs of benefit when AMO959 is given with AAA617 and, in some cases, an androgen receptor pathway inhibitor (ARPI).

Table of Contents

Trial overview

This clinical trial is studying AMO959 in adults with PSMA-positive prostate cancer that has spread to other parts of the body.[1] The trial title and summary show that the study is focused on metastatic castration-resistant prostate cancer, also called mCRPC.[1]

The trial is looking at AMO959 given with AAA617 and, in some parts of the study, with an androgen receptor pathway inhibitor (ARPI).[1] The study is interventional, which means participants receive the study treatment rather than only being observed.[1]

Who the trial is for

The trial is designed for adults with PSMA-positive mCRPC who have already had at least one ARPI.[1] This means the cancer has kept growing despite strong hormone-based treatment.[1]

PSMA-positive means the cancer cells show prostate-specific membrane antigen, a marker used to identify the right study population.[1] The trial data do not describe other broad eligibility rules, so the main known group is this specific prostate cancer population.[1]

What is being studied

The main purpose is to learn about the safety and tolerability of AMO959 when it is combined with AAA617 and an ARPI.[1] Safety means how often unwanted medical problems happen, and tolerability means how well people can stay on treatment.[1]

The Phase Ib part is described as an escalation study, which means doses are studied step by step to help find a Recommended Dose for Expansion (RDE).[1] The Phase II part is meant to look at preliminary efficacy, which means early signs of whether the treatment may help.[1]

The trial also includes several prostate cancer treatments in the intervention list, including enzalutamide, abiraterone, prednison, degarelix, relugolix, Pluvicto, piflufolastat (18F), and gozetotide.[1] The source does not explain how each one is used in every participant, so the key point is that AMO959 is being studied in a treatment program for advanced prostate cancer.[1]

Trial phases and design

The study is listed as Phase 1 and has two main parts: Phase Ib and Phase II.[1] Phase Ib focuses on dose escalation, which means testing treatment levels carefully before moving forward.[1]

Phase II then looks at early effectiveness after the dose has been better defined.[1] This design helps researchers first check safety and dose, then look for signs that the treatment may work.[1]

Outcomes being measured

The main outcome is the incidence of dose-limiting toxicities (DLTs) during the first cycle of combination treatment.[1] DLTs are side effects serious enough to limit further dose increases or change the treatment plan.[1]

The study also measures adverse events, serious adverse events, laboratory value changes, vital signs, and deaths.[1] These measures help the research team understand how the treatment affects the body over time.[1]

Another set of outcomes looks at tolerability, including dose interruptions, dose reductions, discontinuation, dose intensity, and duration of exposure.[1] In simple terms, this shows whether people can keep taking the treatment and how much treatment they actually receive.[1]

The study also measures PSA50, which means a drop of at least 50% in prostate-specific antigen, confirmed by a second test taken at least 4 weeks later.[1] PSA is a blood marker often used in prostate cancer to track disease activity.[1]

Trial status and size

The trial is listed as Authorised.[1] The planned enrollment is 123 participants.[1]

Because only one trial record is provided, the article focuses on this single authorised study of AMO959 in advanced prostate cancer.[1] The source data do not provide final results, so the current information is about the study plan rather than the outcome.[1]

Trial ID Phase Condition studied Status Enrollment
2025-521859-23-00 Phase 1 PSMA-positive metastatic castration-resistant prostate cancer with prior ARPI exposure Authorised 123

Ongoing Clinical Trials on AMO959

  • Study of AMO959, lutetium (177Lu) vipivotide tetraxetan, and a drug combination for adults with advanced prostate cancer.

    Recruiting

    1 1 1 1
    Investigated diseases:
    France Germany Italy Spain

Glossary

  • PSMA-positive: A cancer test result showing prostate-specific membrane antigen on the tumor cells. This is used to select patients for the study.
  • Metastatic: Cancer that has spread from the original place to other parts of the body.
  • Castration-resistant prostate cancer (mCRPC): Prostate cancer that keeps growing even when treatment lowers male hormones very strongly.
  • Androgen receptor pathway inhibitor (ARPI): A treatment that blocks signals from male hormones that can help prostate cancer grow.
  • Phase 1: An early trial phase that mainly looks at safety, side effects, and dose.
  • Phase Ib: A part of Phase 1 that often tests doses to help choose the best dose for later study.
  • Phase II: A trial phase that looks more closely at whether a treatment may help and continues to check safety.
  • Dose-limiting toxicities (DLTs): Side effects that are serious enough to limit how much treatment can be given.
  • Adverse events (AEs): Any unwanted medical problems during the study, whether or not they are caused by the treatment.
  • Serious adverse events (SAEs): Unwanted medical problems that are severe, life-threatening, or need urgent care.
  • PSA50: A drop of at least 50% in prostate-specific antigen (PSA) blood level, confirmed by a later test.
  • Recommended Dose for Expansion (RDE): The dose chosen after early testing to use in the next part of the study.

References

  1. https://clinicaltrials.gov/study/2025-521859-23-00