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BAY3546828

Phase 1

Metastatic Castration-resistant Prostate Cancer | Small molecule | Oncology |Bayer AG|Last Updated: Jul 6, 2026

Success Probability

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment232

FDA Designations

No designations recorded

Clinical trial landscape

BAY3546828 · 1 trial · 1 indication

Phase 1 1
NCT06052306A Study to Learn How Safe the Study Treatment Actinium-225-macropa-pelgifatamab (BAY3546828) is, How it Affects the Body, How it Moves Into, Through and Out of the Body, and About Its Anticancer Activity in Participants With Advanced Metastatic Castration-resistant Prostate Cancer (mCRPC)Metastatic Castration-resistant Prostate Cancer
ACTIVE NOT_RECRUITING232 Analytics
PHASE1ACTIVE NOT_RECRUITING
A Study to Learn How Safe the Study Treatment Actinium-225-macropa-pelgifatamab (BAY3546828) is, How it Affects the Body, How it Moves Into, Through and Out of the Body, and About Its Anticancer Activity in Participants With Advanced Metastatic Castration-resistant Prostate Cancer (mCRPC)
Metastatic Castration-resistant Prostate CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Dose escalation & Dose expansion: The Incidence of treatment-emergent adverse events (TEAEs) including treatment-emergent serious adverse events (TESAEs)
After first administration of study treatment up to 42 days after the last dose of study treatment
Dose escalation & Dose expansion: The Severity of TEAEs including TESAEs
After first administration of study treatment up to 42 days after the last dose of study treatment
Dose escalation: Incidence of dose limiting toxicities (DLTs) at each 225Ac dose level during the DLT observation period
Up to Cycle 3 (each cycle is 42 days)

DLTs will be summarized by MedDRA system organ class, preferred term and worst CTCAE grade.

Dose escalation: Objective response rate (ORR) at each 225Ac dose level during the DLT observation period
Up to Cycle 3 (each cycle is 42 days)

ORR is defined as the proportion of participants who have a confirmed complete response (CR) or partial response (PR) per PCWG3 guidelines, as assessed by the Investigator.

Dose escalation: ≥50% decline in Prostate-specific antigen value from baseline (Cycle 1, Day 1) (PSA50) response at each 225Ac dose level during the DLT observation period
Up to Cycle 3 (each cycle is 42 days)

PSA partial response is defined as a ≥50% decline in PSA value from Cycle 1 Day 1 (baseline). This PSA decline must be confirmed to be sustained by a second PSA value obtained 3 to 4 or more weeks later.

Dose expansion: Objective response rate (ORR) by Prostate Cancer Working Group 3 (PCWG3) guidelines based on investigator review
Up to 12 months after End of treatment
Dose expansion: ≥50% decline in Prostate-specific antigen value from baseline (Cycle 1, Day 1) (PSA50) response at 12 weeks or later
At 12 weeks or later (up to 12 months after End of treatment)
Dose expansion: Best overall Prostate-specific antigen (PSA) response
Up to 12 months after End of treatment

Secondary Endpoints

Dose escalation & Dose expansion: Radiologic progression-free survival (rPFS ) by PCWG3 based on investigator review
Up to 12 months after end of treatment
Dose escalation & Dose expansion: Duration of PSA50 response
Up to 12 months after end of treatment
Dose escalation & Dose expansion: Duration of response (DOR) by PCWG3 based on investigator review
Up to 12 months after end of treatment
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Dose escalation of BAY3546828EXPERIMENTALParticipants with advanced metastatic castration-resistant prostate cancer (mCRPC) will receive 225Ac-pelgi dose in a stepwise fashion, according to a predefined dose escalation scheme
Dose expansion group A of BAY3546828EXPERIMENTALParticipants with advanced mCRPC with at least 1 but no more than 2 prior taxane regimens. No prior radionuclide therapy
Dose expansion group B of BAY3546828EXPERIMENTALParticipants with advanced mCRPC who have not received taxane chemotherapy since becoming castration-resistant. No prior radionuclide therapy.
Dose expansion group C of BAY3546828EXPERIMENTALParticipants with advanced mCRPC after prior Lutetium-177 labeled PSMA ligand (177Lu-PSMA) treatment.

Interventions

NameTypeDescription
BAY3546828DRUGIntravenous (IV) infusion on Day 1 of each cycle.
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Eligibility Criteria

Age Range18 Years to N/A
SexMALE
Healthy VolunteersNo
Study Sites28

Inclusion Criteria: * mCRPC with pathological confirmation of adenocarcinoma without small-cell or neuroendocrine features. * Previous treatment with at least 1 Novel androgen axis drug (NAAD) (e.g., enzalutamide, apalutamide, darolutamide and/or abiraterone). * Prior orchiectomy and/or ongoing and...

Countries:United StatesCanadaFinlandItalyNetherlandsSwedenSwitzerlandUnited Kingdom
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Recent Changes (Last 90 Days)

LOWJul 6, 2026NCT06052306lastUpdatePostDate: changed
LOWJul 6, 2026NCT06052306lastUpdatePostDate: changed

Frequently asked questions about BAY3546828

What is BAY3546828 used for?

BAY3546828 is an investigational small molecule being studied for the treatment of metastatic castration-resistant prostate cancer (mCRPC). It is currently in Phase 1 clinical development, meaning it has not yet been approved by regulatory authorities and is still being evaluated for safety and efficacy in clinical trials.

What does BAY3546828 target?

BAY3546828 is a small molecule that is being studied for its anticancer activity. The specific molecular target of BAY3546828 has not been disclosed in the available information, so its precise mechanism of action is not publicly detailed.

Who is developing BAY3546828?

BAY3546828 is being developed by Bayer AG, a multinational pharmaceutical company. Bayer AG is publicly traded under the ticker symbol BAYRY on the over-the-counter market. The company is conducting clinical trials to evaluate the safety and efficacy of this investigational drug.

What phase is BAY3546828 in?

BAY3546828 is currently in Phase 1 clinical development. It is an investigational drug, meaning it has not been approved by the FDA or other regulatory agencies. The ongoing Phase 1 trial is designed to assess the drug's safety, how it affects the body, and its anticancer activity in patients with advanced metastatic castration-resistant prostate cancer.

What clinical trials is BAY3546828 in?

BAY3546828 is being studied in a Phase 1 clinical trial registered as NCT06052306. This trial is active but not recruiting participants, with a planned enrollment of 232 patients. The study is evaluating the safety, pharmacokinetics, and anticancer activity of BAY3546828 in patients with advanced metastatic castration-resistant prostate cancer.

Is BAY3546828 the same as Actinium-225-macropa-pelgifatamab?

Yes, BAY3546828 is also known as Actinium-225-macropa-pelgifatamab. The clinical trial NCT06052306 refers to the study treatment as Actinium-225-macropa-pelgifatamab (BAY3546828), indicating that these names refer to the same investigational drug.