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FG-3246

Phase 2

Metastatic Castration-Resistant Prostate Cancer | Small molecule | Oncology |Kyntra Bio, Inc.|Last Updated: Aug 17, 2026

Target and mechanism

Molecular targetCD46
Target classProtein
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedCONTROLLEDDMC
Total Trials1
Total Enrollment75

FDA Designations

No designations recorded

Clinical trial landscape

FG-3246 · 1 trial · 1 indication

Phase 2 1
NCT06842498A Study of FG-3246 in Participants With Metastatic Castration-Resistant Prostate Cancer (mCRPC)Metastatic Castration-Resistant Prostate Cancer
RECRUITING75 Analytics
PHASE2RECRUITING
A Study of FG-3246 in Participants With Metastatic Castration-Resistant Prostate Cancer (mCRPC)
Metastatic Castration-Resistant Prostate CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

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
Until radiographic progression is noted (up to approximately 25 months)
Number of Participants With Treatment-emergent Adverse Events (TEAEs)
From first dose until 28 days after last dose (up to approximately 25 months)
Maximum Plasma Concentration (Cmax) of FG-3246, Total Anti-cluster of Differentiation 46 Antibody (CD46), and Free Monomethyl Auristatin E (MMAE)
Within each 21 day treatment cycle from Cycle 1 through 28 days post last dose (up to approximately 25 months)

Secondary Endpoints

rPFS Rate at 6 Months (rPFS6) Per RECIST v1.1 and PCWG3 Criteria
Month 6
rPFS Rate at 12 Months (rPFS12) Per RECIST v1.1 and PCWG3 Criteria
Month 12
Confirmed Objective Response Rate (ORR) Per RECIST v1.1 and PCWG3 Criteria
From first dose up to approximately 25 months
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
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.
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.
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.

Interventions

NameTypeDescription
FG-3246DRUGFG-3246 will be administered per schedule specified in the arm description.
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Eligibility Criteria

Age Range18 Years to N/A
SexMALE
Healthy VolunteersNo
Study Sites23

Key Inclusion Criteria: * 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 dur...

Countries:United States
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Recent Changes (Last 90 Days)

LOWAug 17, 2026NCT06842498lastUpdatePostDate: changed
LOWAug 17, 2026NCT06842498lastUpdatePostDate: changed

Frequently asked questions about FG-3246

What is FG-3246 used for in metastatic castration-resistant prostate cancer?

FG-3246 is an investigational small molecule being developed for the treatment of metastatic castration-resistant prostate cancer (mCRPC). It is currently in Phase 2 clinical development and is being studied in a randomized, controlled trial in the United States.

What does FG-3246 target?

FG-3246 targets CD46, a protein that is expressed on the surface of cancer cells. By binding to CD46, FG-3246 is designed to interfere with cancer cell survival and proliferation in metastatic castration-resistant prostate cancer.

Who makes FG-3246?

FG-3246 is being developed by Kyntra Bio, Inc., a biopharmaceutical company. Kyntra Bio is listed on the stock exchange under the ticker symbol KYNB.

What phase is FG-3246 in?

FG-3246 is currently in Phase 2 clinical development. It is an investigational drug and has not been approved by the FDA. The ongoing Phase 2 trial is actively recruiting participants with metastatic castration-resistant prostate cancer.

What clinical trials is FG-3246 in?

FG-3246 is being evaluated in a Phase 2 clinical trial with the identifier NCT06842498. This trial is recruiting male participants aged 18 years and older with metastatic castration-resistant prostate cancer in the United States, with a planned enrollment of 75 participants.