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ARX517

Phase 1

Metastatic Prostate Cancer | Small molecule | Oncology |Johnson & Johnson|Last Updated: Jun 5, 2026

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
CONTROLLEDBiomarker
Total Trials1
Total Enrollment183
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT04662580ARX517/JNJ-95298177 as Monotherapy or Combination Therapy in Subjects With Metastatic Prostate CancerPHASE1 ACTIVE NOT_RECRUITING 183May 3, 2021Dec 31, 2026Jun 5, 202612 United States
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Study Endpoints
Primary Endpoints
Assess incidence of adverse events
1.5 Years

Incidence and severity of adverse events or serious adverse events of ARX517 alone or in combination with ARPIs will be assessed to determine the safety and tolerability of the treatment using National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events version 5 (CTCAE).

Secondary Endpoints
Area under the serum concentration-time curve (AUC) for ARX517 alone or in combination with ARPIs
3 Year
Maximum serum concentration (Cmax) for ARX517 alone or in combination with ARPIs
3 Year
Trough concentration (Ctrough) for ARX517 alone or in combination with ARPIs
3 Year
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
ARX517EXPERIMENTALARX517 will be administered via intravenous (IV) infusion, with the initial treatment regimen by weight-based infusion at an interval of every 3 weeks. Other treatment regimen may be explored.
ARX517+ApalutamideEXPERIMENTALARX517 and apalutamide
ARX517+AAPEXPERIMENTALARX517 and abiraterone acetate plus prednisone(AAP)
Interventions
NameTypeDescription
ARX517DRUGARX517 is an ADC consisting of a humanized anti-PSMA monoclonal antibody (mAb) (IgG1κ) covalently conjugated to two (2) proprietary microtubule-disrupting toxins referred to as AS269.
ApalutamideDRUGOral tablet and will be given once daily by mouth.
Abiraterone acetateDRUGOral tablet and will be given once daily by mouth.
PrednisoneDRUGOral tablet and will be given once daily in metastatic castration-sensitive prostate cancer( mCSPC) and twice daily in metastatic castration-resistant prostate cancer (mCRPC) cohort by mouth.
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Eligibility Criteria
Age Range18 Years — N/A
SexMALE
Healthy VolunteersNo
Study Sites12

Key Inclusion Criteria: * Male and ≥18 years at the time of providing written informed consent. * Histologically confirmed prostate adenocarcinoma. * For subjects who have not undergone an orchiectomy, must be undergoing treatment with a luteinizing hormone-releasing hormone (LHRH) agonist or antag...

Countries:United States
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Competitive Landscape -Prostate Cancer 259 trials
CompanyTickerTrialsLead PhaseDrugs
Merck & Co., Inc.MRK7PHASE3Pembrolizumab, Enzalutamide, Ifinatamab deruxtecan, Docetaxel, Prednisone
AstraZeneca PLCAZN20PHASE3olaparib, abiraterone, Saruparib, Abiraterone, Darolutamide
Pfizer Inc.PFE12PHASE3Talazoparib with enzalutamide, PF-06821497, Docetaxel, Enzalutamide, Leuprolide Open Label
Johnson & JohnsonJNJ21PHASE3Apalutamide, Androgen Deprivation Therapy, Niraparib, Abiraterone, Prednisone
Eli Lilly and CompanyLLY9PHASE3Abemaciclib, Abiraterone, Prednisone or Prednisolone, -PNT2002, Enzalutamide
Amgen Inc.AMGN7PHASE3Xaluritamig, Abiraterone, Enzalutamide, Cabazitaxel, Docetaxel
Novartis AG Sponsored ADRNVS28PHASE3177Lu-PSMA-617, 68Ga-PSMA-11, ARDT, ADT, AAA617
Exelixis, Inc.EXEL4PHASE3Cabozantinib, Atezolizumab, Abiraterone, Enzalutamide, Prednisone
Candel Therapeutics, Inc.CADL3PHASE3Aglatimagene besadenovec + valacyclovir, aglatimagene besadenovec, valacyclovir, aglatimagene besadenovec + valacyclovir
Bristol-Myers Squibb CompanyBMY2PHASE3BMS-986365, Enzalutamide, Abiraterone, Docetaxel, Predinsone/Prednisolone
BioNTech SE Sponsored ADRBNTX1PHASE3BNT324, Docetaxel, Prednisone/prednisolone
Telix Pharmaceuticals Limited Sponsored ADRTLX3PHASE368Ga-PSMA-11, 177Lu-TLX591, Enzalutamide, Abiraterone, Docetaxel
Sanofi SA Sponsored ADRSNY2PHASE3abiraterone, Docetaxel, Cabazitaxel
Regeneron Pharmaceuticals, Inc.REGN4PHASE2REGN2810, Degarelix, Leuprolide, Docetaxel, BPX-601
Veracyte, Inc.VCYT2PHASE2Darolutamide, Zoladex, Zoladex LA, Decapeptyl sustained release, Depo-Eligard
Kyntra Bio, Inc.KYNB2PHASE2FG-3246, FOR46, Enzalutamide, Pegfilgrastim
Lantheus Holdings IncLNTH3PHASE3Undisclosed
IDEAYA Biosciences, Inc.IDYA3PHASE1IDE-161, Pembrolizumab, IDE034, IDE574, Fulvestrant
Xencor, Inc.XNCR1PHASE2vudalimab
GSK plc Sponsored ADRGSK2PHASE1GSK5471713, GSK5458514
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Recent Changes (Last 90 Days)
LOWJun 5, 2026NCT04662580lastUpdatePostDate: changed
LOWJun 5, 2026NCT04662580lastUpdatePostDate: changed
LOWJun 5, 2026NCT04662580lastUpdatePostDate: changed
LOWJun 5, 2026NCT04662580lastUpdatePostDate: changed
LOWMay 26, 2026NCT04662580primaryCompletionDate: changed
LOWMay 24, 2026NCT04662580studyFirstPostDate: changed