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ARX517

Phase 1

Metastatic Prostate Cancer | Small molecule | Oncology |Johnson & Johnson|Last Updated: Aug 28, 2026

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment183

FDA Designations

No designations recorded

Clinical trial landscape

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 254 trials (matched to "Metastatic Prostate Cancer")

Recent Changes (Last 90 Days)

LOWAug 28, 2026NCT04662580lastUpdatePostDate: changed
LOWAug 28, 2026NCT04662580lastUpdatePostDate: changed
LOWJul 6, 2026NCT04662580lastUpdatePostDate: changed
LOWJul 6, 2026NCT04662580lastUpdatePostDate: changed

Frequently asked questions about ARX517

What is ARX517 used for in metastatic prostate cancer?

ARX517 is an investigational small molecule being studied for the treatment of metastatic prostate cancer. It is currently in Phase 1 clinical development and has not been approved by regulatory authorities. The drug is being evaluated as a monotherapy or in combination therapy for patients with this condition.

Who makes ARX517?

ARX517 is being developed by Johnson & Johnson, a company traded on the New York Stock Exchange under the ticker JNJ. The drug is currently in Phase 1 clinical trials for metastatic prostate cancer.

What phase is ARX517 in?

ARX517 is in Phase 1 clinical development. It is an investigational drug and has not received regulatory approval. The ongoing Phase 1 trial is active but not recruiting participants, and the drug is being studied for metastatic prostate cancer.

What clinical trials is ARX517 in?

ARX517 is being studied in a Phase 1 clinical trial with the identifier NCT04662580. This trial is evaluating ARX517, also known as JNJ-95298177, as a monotherapy or combination therapy in subjects with metastatic prostate cancer. The trial is active but not recruiting and has an enrollment of 183 participants.

Is ARX517 the same as JNJ-95298177?

Yes, ARX517 is also known as JNJ-95298177. In clinical trials, the drug is referred to by both names. The Phase 1 trial NCT04662580 evaluates ARX517/JNJ-95298177 as a monotherapy or combination therapy for metastatic prostate cancer.