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ARX517

Phase 1

Metastatic Prostate Cancer | Small molecule | Oncology |Johnson & Johnson|Trials Updated: Sep 28, 2026

ARX517 development status

Highest phase Phase 1
Registered trials 2 across 1 sponsor since Dec 2020

ARX517 target and mechanism

ModalitySmall molecule

Also known as JNJ-95298177

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDBiomarker
Total Trials1
Total Enrollment183

FDA Designations

No designations recorded

ARX517 clinical trials

ARX517 · 1 trial · 1 indication

Phase 1 1
NCT04662580ARX517/JNJ-95298177 as Monotherapy or Combination Therapy in Subjects With Metastatic Prostate CancerMetastatic Prostate Cancer
ACTIVE NOT_RECRUITING183 Analytics
PHASE1ACTIVE NOT_RECRUITING
ARX517/JNJ-95298177 as Monotherapy or Combination Therapy in Subjects With Metastatic Prostate Cancer
Metastatic Prostate CancerUnlock trial analytics

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 to 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 417 trials (matched to "Metastatic Prostate Cancer")

Top 20 of 55 competitors

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Recent Changes (Last 90 Days)

LOWSep 28, 2026NCT04662580lastUpdatePostDate: changed
LOWSep 28, 2026NCT04662580lastUpdatePostDate: changed
LOWAug 28, 2026NCT04662580lastUpdatePostDate: changed
LOWAug 28, 2026NCT04662580lastUpdatePostDate: changed

Frequently asked questions about ARX517

What is ARX517 used for?

ARX517 is an investigational therapy being studied for the treatment of metastatic prostate cancer. It is being developed as a monotherapy or in combination therapy for adult male patients with this condition. ARX517 has not been approved for any indication and remains in clinical development.

Who is developing ARX517?

ARX517 is being developed by Johnson & Johnson, which trades under the ticker symbol JNJ. The company is the sponsor of the clinical program evaluating ARX517 in metastatic prostate cancer.

What phase is ARX517 in?

ARX517 is in Phase 1 clinical development. The single registered trial for ARX517 is a Phase 1 study, and it is currently active but not recruiting participants. ARX517 has not been approved by the FDA or any regulatory agency.

What clinical trials is ARX517 in?

ARX517 is being evaluated in one clinical trial, NCT04662580, titled "ARX517/JNJ-95298177 as Monotherapy or Combination Therapy in Subjects With Metastatic Prostate Cancer." The trial is a Phase 1 study with an enrollment of 183 participants, conducted in the United States, and is currently active but not recruiting.

Is ARX517 biomarker-selected?

Yes, the ARX517 clinical trial is biomarker-selected, meaning participants are chosen based on specific biological markers. The study enrolls adult male patients aged 18 years and older with metastatic prostate cancer and does not include healthy volunteers.