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FOR46

Phase 1

Metastatic Castration-resistant Prostate Cancer | Monoclonal antibody | Oncology |Kyntra Bio, Inc.|Last Updated: Aug 27, 2025

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment44
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT05011188FOR46 in Combination With Enzalutamide in Patients With Metastatic Castration Resistant Prostate CancerPHASE1 ACTIVE NOT_RECRUITING 44Jan 19, 2022Jul 31, 2027Aug 27, 20251 United States
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Study Endpoints
Primary Endpoints
Maximally tolerated dose (MTD) (Phase 1b)
Up to 3 weeks

A minimum of 3 patients will be treated at each dose level. If \< 33%of patients (i.e. 0 of 3 patients, or 1 of 6 patients) within a cohort have a dose-limiting toxicity (DLT in Cycle 1, then enrollment of the next cohort may commence upon approval of Data and Safety Monitoring Committee. At any dose level, dose escalation will be discontinued if \>= 2 of 3 to 6 patients within a cohort experience a DLT in Cycle 1, the MTD will have been exceeded. The previous dose level will then be considered the MTD if 6 patients were previously evaluated at this dose level. If this dose level was previously evaluated with 3 patients, then 3 additional patients will be enrolled at this dose level; if 0 or 1 of the additional 3 patients experiences a DLT in Cycle 1, then this dose level will be considered the MTD.

Number of participants with Dose-Limiting Toxicities (Phase 1b)
Up to 3 weeks

Dose-limiting toxicities classified using the Common Terminology Criteria for Adverse Events (CTCAE) version 5.0will be tabulated by dose level and reported in descriptive fashion.

Composite response rate (CRR) (Phase 2)
Up to 2 years

Composite response is defined as a \>= 50% decline from baseline PSA (defined by Cycle 1 Day 1 value), confirmed by repeat measurement \>= 4 weeks later AND/OR objective tumor response by RECIST 1.1 criteria The composite response rate along with 95% confidence interval will be reported

Secondary Endpoints
Proportion of participants with a greater than or equal to 50% change in PSA (PSA50)
Up to 2 years
Objective response rate (ORR)
Up to 2 years
Median duration of objective response
Up to 2 years
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Does EscalationEXPERIMENTALApproximately 3 dose levels of FOR46 will be evaluated. Participants will receive a lead-in treatment period of enzalutamide monotherapy for 14 days (day -14 to day -1), followed by addition of FOR46 on Cycle 1 Day 1. If participants are on enzalutamide at the time of study entry, and remain on continuous dosing at 160 mg daily, the lead-in treatment period will not be required. Prophylactic Pegfilgrastim (G-CSF) 6mg, subcutaneously (SQ) will also be administered on Day 2 during all treatment cycles. Pegfilgrastim could be modified to a lower dose of 3 mg with treating investigator approval.
Dose ExpansionEXPERIMENTALParticipants will receive a lead-in treatment period of enzalutamide monotherapy for 14 days (day -14 to day -1), followed by addition of FOR46 on Cycle 1 Day 1, at the maximum tolerated dose (MTD) as determined in Phase 1b. If participants are on enzalutamide at the time of study entry, and remain on continuous dosing at 160 mg daily, the lead-in treatment period will not be required. Prophylactic Pegfilgrastim (G-CSF) 6mg, subcutaneously (SQ) will also be administered on Day 2 during all treatment cycles. Pegfilgrastim could be modified to a lower dose of 3 mg with treating investigator approval.
Interventions
NameTypeDescription
FOR46BIOLOGICALGiven intravenously (IV)
EnzalutamideBIOLOGICALGiven orally (PO)
PegfilgrastimDRUGGiven subcutaneously (subQ)
Blood SamplesPROCEDUREBlood samples will be taken for correlative studies
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Eligibility Criteria
Age Range18 Years — N/A
SexMALE
Healthy VolunteersNo
Study Sites1

Inclusion Criteria: 1. Histologically confirmed metastatic prostate adenocarcinoma. 2. Disease progression by PCWG3 criteria at study entry. 3. Prior progression by PCWG3 criteria on one or more androgen signaling inhibitors including abiraterone acetate, enzalutamide, apalutamide, and/or darolutam...

Countries:United States
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT05011188primaryCompletionDate: changed
LOWMay 24, 2026NCT05011188studyFirstPostDate: changed