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Metastatic Castration-Resistant Prostate CancerPhase 2NCT06842498

A Study of FG-3246 in Participants With Metastatic Castration-Resistant Prostate Cancer (mCRPC)

A Phase 2 study testing FG-3246 in people with Metastatic Castration-Resistant Prostate Cancer, run by Kyntra Bio at 23 sites in United States.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
Search all trials

Trial summary

The purpose of this study is to evaluate the safety, efficacy, tolerability, and pharmacokinetics (PK) of FG-3246, a cluster of differentiation 46 (CD46) targeting antibody-drug conjugate (ADC), in the treatment of participants with mCRPC who have progressed following treatment with one prior second-generation… Read more about this study

Who is it for?
Ages 18 years and older, men only
What is being tested?
FG-3246
Type of treatment
Injection or infusion
Could I receive a placebo?
No, everyone receives an active treatment
How many people
75 participants
Where
23 sitesUnited States
Study dates
22 Feb 2026to 31 Mar 2028
Phase
Phase 2
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • Men only
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Participant must have histological, and/or cytological confirmation of prostate adenocarcinoma on all prior tumor biopsies.
  • Participant with soft tissue disease and a safely accessible soft tissue tumor lesion(s) must agree to biopsy of a primary or metastatic lesion during screening. Alternatively, participant may provide a suitable archival biopsy of a primary or metastatic lesion.
  • Participant must have serum testosterone levels <50 nanograms (ng)/deciliter (dL) during screening.
  • Participant is required to have progressed on no more than one prior treatment with a second generation ARSI (abiraterone acetate, enzalutamide, apalutamide, or darolutamide) initiated in either the castration-sensitive or castration-resistant setting.
  • Participant must have progressive mCRPC following last treatment at screening.
  • Participant must have ≥1 metastatic lesion that is present on baseline Computed Tomography (CT), Magnetic Resonance Imaging (MRI), or bone scan obtained ≤28 days prior to randomization.
  • Participant must have adequate organ function during screening.

Who cannot join

  • Participant has received previous treatment with a therapeutic targeting CD46.
  • Participant has small cell neuroendocrine carcinoma (pure or mixed) on any prior histologic evaluation of primary or metastatic lesion.
  • Participant has progressed on more than one prior second-generation ARSI in any setting or has received more than two prior second-generation ARSIs in any setting.
  • Participants must not have received recent anticancer treatments before enrollment. Ongoing supportive or hormonal therapies are allowed if they were started well before randomization and are continued without change.
  • Participant has received any prior radiation therapy within 14 days prior to randomization.
  • Participant has a known actionable mutation or gene alteration, for example, BRCA1 mutation, for which approved therapies are available, for example, PARP inhibitors, unless these therapies are not appropriate for the participant as determined by the investigator or the participant refuses such therapy.
Show all 12Show fewer
  • Participant has National Cancer institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE) ≥Grade 2 peripheral neuropathy at the time of screening from any etiology.
  • Participant has received any prior chemotherapy; however, one prior taxane-based chemotherapy in the castration-sensitive setting is allowed if completed >12 months before randomization.
  • Participant has known hypersensitivity to the components of FG-3246 or its analogs or a history of allergic or anaphylactic reaction to human, humanized, or chimeric monoclonal antibodies.
  • Participant has diagnosis with any other malignancy in the past 5 years, except for adequately treated basal cell or squamous cell carcinoma of the skin.
  • Participant requires treatment with a strong cytochrome P450 3A4 (CYP3A4) inhibitor or inducer drug that cannot be safely discontinued.
  • NOTE: Other protocol-defined inclusion/exclusion may apply.

Trial locations and contacts

23 sites in 1 country. Contact the study team or a site near you to ask about taking part.

23 sites in 1 country

United States23 sites, 23 recruiting
  • New Mexico Oncology Hematology Consultants, Ltd.

    Albuquerque, New Mexico, 87109

    Daisy Sanchez, 505-842-8171, research@nmohc.com

    Recruiting
  • Winship Cancer Institute, Emory University

    Atlanta, Georgia, 30322

    Emily Setser, 404-778-4968, emily.setser@emory.edu

    Recruiting
  • Bioresearch Partner - Aventura

    Aventura, Florida, 33180

    Angelo Gousse, 833-489-4968, agoussemd@bioresearchpartner.com

    Recruiting
  • University of Virginia Comprehensive Cancer Center

    Charlottesville, Virginia, 22908

    Clinical Trials Navigator, 434-982-0539, uvacancertrials@hscmail.mcc.virginia.edu

    Recruiting
  • University Hospitals Cleveland Medical Center

    Cleveland, Ohio, 44106

    Pedro Barata, 801-585-0255, Pedro.Barata@UHhospitals.org

    Recruiting
  • University of Texas Southwestern Medical Center

    Dallas, Texas, 75390

    Amy Rowell, 214-645-9688, amy.rowell@utsouthwestern.edu

    Recruiting
  • Duke University Medical Center - Duke Cancer Center

    Durham, North Carolina, 27710

    Andrew Armstrong, 919-668-4667, andrew.armstrong@duke.edu

    Recruiting
  • Western Regional Medical Center - City of Hope Phoenix Goodyear

    Goodyear, Arizona, 85338

    Firas Shada, 847-342-6910, fshadad@coh.org

    Recruiting
  • Bioresearch Partner - Hialeah

    Hialeah, Florida, 33013

    Luis Rangel, 833-489-4968, lrangel@bioresearchpartner.com

    Recruiting
  • Oncology Consultants

    Houston, Texas, 77030

    Julio Peguero, 713-600-0900, jpeguero@oncologyconsultants.com

    Recruiting
  • VA Greater Los Angeles Healthcare System

    Los Angeles, California, 90073

    Matthew Rettig, 310-478-3711 ext. 44761, matthew.rettig@va.gov

    Recruiting
  • UCLA Clark Urology Center

    Los Angeles, California, 90095

    Ankush Sachdeva, 310-794-3452, asachdeva@mednet.ucla.edu

    Recruiting
  • Biogenix Molecular, LLC

    Miami, Florida, 33165

    Jerry Joseph, 786-791-1799, jjoseph@cira-health.com

    Recruiting
  • Carolina Urologic Research Center

    Myrtle Beach, South Carolina, 29572

    Kate Valipour, 843-449-1010 ext. 5268, kate.valipour@startresearch.com

    Recruiting
  • Henry-Joyce Cancer Clinic

    Nashville, Tennessee, 37232

    Clinical Trials Office, Vanderbilt-Ingram Cancer Center, 800-811-8480, CIP@VUMC.ORG

    Recruiting
  • New Haven Hospital - Yale Cancer Center

    New Haven, Connecticut, 06519

    Amanda Davis, 475-321-7899, Amanda.Davis@yale.edu

    Recruiting
  • East Jefferson General Hospital Metairie

    New Orleans, Louisiana, 70112

    Sarah Bigelow, 504-988-6123, sbigelow@tulane.edu

    Recruiting
  • University of California San Francisco

    San Francisco, California, 94158

    Daniel Avins, 415-514-4222, daniel.avins@ucsf.edu

    Recruiting
  • HonorHealth Research Institute

    Scottsdale, Arizona, 85258

    Amy Malensek, 480-323-1791, amalensek@honorhealth.com

    Recruiting
  • Fred Hutchinson Cancer Center

    Seattle, Washington, 98109

    Michael Schweizer, 206-606-6252, schweize@uw.edu

    Recruiting
  • University of Washington Medical Center

    Seattle, Washington, 98195

    Michael Schweizer, 206-606-6252, schweize@uw.edu

    Recruiting
  • Northwest Medical Specialties, PLLC - Tacoma

    Tacoma, Washington, 98405

    Patricia Walsh, 253-428-8700, pwalsh@nwmsonline.com

    Recruiting
  • The University of Arizona Cancer Center - North Campus

    Tucson, Arizona, 85719

    Alana Sudkamp, 520-621-5895, alanamsudkamp@arizona.edu

    Recruiting

Other trials in United States

About this study

Official title: A Phase 2 Dose Optimization Trial Evaluating a CD46-Targeted Antibody-Drug Conjugate (FG-3246) in Patients With Metastatic Castration-Resistant Prostate Cancer

The purpose of this study is to evaluate the safety, efficacy, tolerability, and pharmacokinetics (PK) of FG-3246, a cluster of differentiation 46 (CD46) targeting antibody-drug conjugate (ADC), in the treatment of participants with mCRPC who have progressed following treatment with one prior second-generation androgen receptor signaling inhibitor (ARSI) in any setting and no prior taxane therapy in the mCRPC setting.

Being tested
FG-3246
Keywords
FG-3246, FOR46, mCRPC, CRPC, CD46, Prostate cancer, Antibody-drug conjugate, Metastatic prostate cancer, FibroGen, ADC, Kyntra, Kyntra Bio, KYNB
Medical subject headings
Prostatic Neoplasms

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • FG-3246Drug

    Also called FOR46

    FG-3246 will be administered per schedule specified in the arm description.

Study groups in NCT06842498
Study groupRoleWhat they receive
FG-3246 1.8 mg/kgExperimentalParticipants will receive FG-3246 1.8 milligrams (mg)/kilogram (kg) administered via intravenous (IV) infusion on Day 1 of each 21-day treatment cycle (every 3 weeks [Q3W]) until radiographic progression, unacceptable safety and tolerability, participant or investigator decision to stop treatment, other withdrawal criteria are met, or sponsor decision to close the study.
Receives: Drug: FG-3246
FG-3246 2.4 mg/kgExperimentalParticipants will receive FG-3246 2.4 mg/kg administered via IV infusion on Day 1 of each 21-day treatment cycle (Q3W) until radiographic progression, unacceptable safety and tolerability, participant or investigator decision to stop treatment, other withdrawal criteria are met, or sponsor decision to close the study.
Receives: Drug: FG-3246
FG-3246 2.7 mg/kgExperimentalParticipants will receive FG-3246 2.7 mg/kg administered via IV infusion on Day 1 of each 21-day treatment cycle (Q3W) until radiographic progression, unacceptable safety and tolerability, participant or investigator decision to stop treatment, other withdrawal criteria are met, or sponsor decision to close the study.
Receives: Drug: FG-3246

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Radiographic Progression-free Survival (rPFS) By Investigator Assessment Per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 and Prostate Cancer Clinical Trials Working Group 3 (PCWG3) Criteria

    Measured: Until radiographic progression is noted (up to approximately 25 months)

  2. Number of Participants With Treatment-emergent Adverse Events (TEAEs)

    Measured: From first dose until 28 days after last dose (up to approximately 25 months)

  3. Maximum Plasma Concentration (Cmax) of FG-3246, Total Anti-cluster of Differentiation 46 Antibody (CD46), and Free Monomethyl Auristatin E (MMAE)

    Measured: Within each 21 day treatment cycle from Cycle 1 through 28 days post last dose (up to approximately 25 months)

Secondary outcomes (13)
  1. rPFS Rate at 6 Months (rPFS6) Per RECIST v1.1 and PCWG3 Criteria

    Measured: Month 6

  2. rPFS Rate at 12 Months (rPFS12) Per RECIST v1.1 and PCWG3 Criteria

    Measured: Month 12

  3. Confirmed Objective Response Rate (ORR) Per RECIST v1.1 and PCWG3 Criteria

    Measured: From first dose up to approximately 25 months

  4. Duration of Response (DoR) Per RECIST v1.1 and PCWG3 Criteria

    Measured: From first dose up to approximately 25 months

  5. Confirmed PSA50 Response Rate: Percentage of Participants Achieving a Decline in Prostate-specific Antigen (PSA) ≥50% From Baseline

    Measured: Up to approximately 25 months

  6. Confirmed PSA90 Response Rate: Percentage of Participants Achieving a Decline in PSA ≥90% From Baseline

    Measured: Up to approximately 25 months

  7. Composite Response Rate (CRR) Per RECIST 1.1 and PCWG3 Criteria

    Measured: Up to approximately 25 months

  8. PSA Progression-free Survival (PFS)

    Measured: Up to approximately 25 months

  9. Disease Control Rate (DCR) per RECIST 1.1 and PCWG3 Criteria

    Measured: Up to approximately 25 months

  10. Clinical Benefit Rate (CBR) per RECIST 1.1 and PCWG3 Criteria

    Measured: Up to approximately 25 months

  11. Time to First Symptomatic Skeletal-related Event (SSRE)

    Measured: Up to approximately 25 months

  12. Overall Survival (OS)

    Measured: Until death or up to approximately 25 months

  13. Percentage of Participants Who Develop Anti-drug Antibodies (ADA) and Neutralizing Antibody (NAb) Against FG-3246

    Measured: Within each 21 day treatment cycle from Cycle 1 through 28 days post last dose (up to approximately 25 months)

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted24 Feb 2025
  2. Study start22 Feb 2026
  3. Primary completion31 Mar 2028 (estimated)
  4. Study completion31 Mar 2028 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
None (open label)
Enrolment
75 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06842498
Sponsor's protocol ID
FGCL-3246-112
Status last verified
Aug 2026
First submitted
19 Feb 2025
Last updated
17 Aug 2026
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing FG-3246 in people with Metastatic Castration-Resistant Prostate Cancer, run by Kyntra Bio at 23 sites in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 7 inclusion and 12 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 17 Aug 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 23 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Javier Moreno (415-978-1466, jmoreno@kyntrabio.com), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Radiographic Progression-free Survival (rPFS) By Investigator Assessment Per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 and Prostate Cancer Clinical Trials Working Group 3 (PCWG3) Criteria (time frame: Until radiographic progression is noted (up to approximately 25 months)). The study lists 3 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 17 Aug 2026.

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