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A Study of JNJ-101556143 in Participants With Metastatic Prostate Cancer

  • PhasePhase 2
  • StatusRecruiting
  • Planned enrollment100 people
  • Recruiting US sites4
  • SponsorJanssen Research & Development, LLC
  • RegistryNCT07832292

Recruitment re-checked on ClinicalTrials.gov Oct 30, 2026. Public record; not medical advice.

A Study of JNJ-101556143 in Participants With Metastatic Prostate Cancer: a one-minute explainerNCT078322921 min

Eligibility

Who can join

The film gives the main points. The full list below is copied from the registry; the study team makes the final decision.

  • Age18 Years to no maximum
  • SexMale
  • Healthy volunteersNo

You may be able to join if

  • Have histologically confirmed adenocarcinoma of the prostate. Primary (or pathologic evidence of conversion to) small cell carcinoma, carcinoid tumor, mixed neuroendocrine carcinoma, large cell neuroendocrine carcinoma, or sarcoma of the prostate is disallowed
  • Progressive metastatic androgen pathway modulation-resistant prostate cancer (mAPMR) defined as having a Prostate-Specific Antigen (PSA) level greater than or equal (>=) 10 nanograms per milliliter (ng/mL) and at least one of the following: (a) PSA progression defined as at least 2 consecutive increases in PSA value over a previous reference value measured at least 1 week apart. (b) Progressive disease or new lesion(s) in the lymph nodes, bones, or viscera on conventional imaging (computed tomography [CT]/magnetic resonance imaging [MRI]) as defined by response evaluation criteria in solid tumors version 1.1 (RECIST v1.1) and/or on bone scan per Prostate Cancer Working Group 4 (PCWG4) while on Androgen Deprivation Therapy (ADT) (either surgically [bilateral orchiectomy] or with medication). Local-regional disease including invasive disease of rectum, bladder, pelvis is allowed as long as participant has a current or past history of distant metastasis (M1 disease). Participants in Part 1 must have measurable disease per RECIST v1.1 by conventional imaging with CT or MRI (chest, abdomen, and pelvis) and/or Technetium-99^m (99^mTc) bone scan confirmed by Blinded Independent Central Review (BICR) at the time of screening
  • Prior bilateral orchiectomy or medical castration (receiving ongoing ADT with a Gonadotropin-Releasing Hormone (GnRH) analog [agonist or antagonist]) with castrate level of serum testosterone (less than [<] 50 nanograms per deciliter [ng/dL] or 1.7 nanomoles per liter [nmol/L]) prior to the first dose of trial intervention and must continue this therapy throughout the treatment phase
  • Have discontinued concurrent use of any non-investigational systemic anticancer therapy (that is, cytotoxic chemotherapy, Androgen Receptor Pathway Inhibitor (ARPI), radiation therapy) within 2 weeks or Lutetium-177 Prostate-Specific Membrane Antigen-617 (177^Lu PSMA-617) within 6 weeks prior to first dose of trial intervention, or any investigational drugs within 3 months of first dose of trial intervention
  • Toxicity related to prior anticancer treatment that is deemed clinically relevant must have resolved to common terminology criteria for adverse events (CTCAE) Version 6.0 Grade 1 or better

You cannot join if

  • Acute or chronic uncontrolled renal disease, pancreatitis, or liver disease (with exception of patients with Gilbert's Syndrome, asymptomatic gallstones, liver metastases, or stable chronic liver disease per investigator assessment)
  • Suspected or known allergies, hypersensitivity, or intolerance to JNJ-101556143 or its excipients
  • Had major surgery or had significant traumatic injury less than or equal to 28 days of the first dose of trial intervention. Note: Participants with planned surgical procedures to be conducted under local anesthesia may participate
  • Spinal cord compression unless considered to have received definitive treatment for this and evidence of clinically stable disease for 28 days
  • Solid organ or bone marrow transplantation

The treatment

How it is intended to work

This is how the treatment is meant to work. Whether it helps, and how safe it is, is what this trial is testing.

Treatments listed in the registry

  • JNJ-101556143 (Drug): Participants will receive JNJ-101556143 orally.

The study

Treatment groups

Na · Single Group · masking: None

JNJ-101556143 (Experimental)

Participants will receive JNJ-101556143 orally once daily in a 28-day treatment cycle until confirmed radiographic progression by blinded independent central review (BICR) or unequivocal clinical progression, or any other protocol-defined discontinuation criteria is met.

Goals

What the study measures

Main goals

  • Overall Response Rate (ORR) (Up to 2 years and 8 months)

Other goals

  • Duration of Response (DoR)
  • Radiographic Progression-Free Survival (rPFS)
  • Time to Symptomatic Progression (TSP)
  • Number of Participants with Treatment-Emergent Adverse Event (TEAE) by Severity
  • Number of Participants with Abnormalities in Clinical Laboratory Tests
  • Minimum Plasma Concentration (Cmin) of JNJ-101556143
  • Maximum Plasma Concentration (Cmax) of JNJ-101556143
  • Area Under the Concentration-Time Curve From 0 to 24 Hours (AUC0-24h) of JNJ-101556143

Planned enrollment: 100 (estimated).

Where

Recruiting US sites

  • Southern Urology LLC, Lafayette, Louisiana
  • Greater Boston Urology, Plymouth, Massachusetts
  • Associated Medical Professionals, Syracuse, New York
  • The Conrad Pearson Clinic, Germantown, Tennessee

1 recruiting sites outside the US. Site status as of Oct 30, 2026. Check the live record before contacting a site.

Sources

Where this comes from

Registry record reviewed as fetched Oct 30, 2026, last updated by the sponsor Sep 24, 2026. Public record; not medical advice.

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