Home/Loved One/NCT06136624
PHASE3RECRUITING
View on ClinicalTrials.gov

Comparing Opevesostat with Abiraterone acetate for prostate cancer metastatic

Official title: Study of Opevesostat (MK-5684) Versus Alternative NHA in mCRPC (MK-5684-003)

A Phase 3 Randomized, Open-label Study of MK-5684 Versus Alternative Abiraterone Acetate or Enzalutamide in Participants With Metastatic Castration-resistant Prostate Cancer (mCRPC) Previously Treated With Next-generation Hormonal Agent (NHA) and Taxane-based Chemotherapy (OMAHA-003)

Condition: Prostate Cancer MetastaticSponsor: Merck Sharp & Dohme LLCTarget enrollment: 1310

Interventions

DRUG

Opevesostat

Administered orally

DRUG

Abiraterone acetate

Administered orally

DRUG

Enzalutamide

Administered orally

DRUG

Hydrocortisone

Administered orally or IM as a rescue medication

DRUG

Fludrocortisone acetate

Administered orally

DRUG

Prednisone

Administered orally as a rescue medication

DRUG

Dexamethasone

Administered orally as rescue medication

Canadian Sites (8)

Cross Cancer Institute ( Site 0332)

Edmonton, Alberta, Canada

RECRUITING

The Ottawa Hospital - General Campus-The Ottawa Hospital Cancer Centre ( Site 0336)

Ottawa, Ontario, Canada

RECRUITING

Sunnybrook Research Institute ( Site 0331)

Toronto, Ontario, Canada

RECRUITING

Princess Margaret Cancer Centre ( Site 0330)

Toronto, Ontario, Canada

RECRUITING

Centre Intégré de Santé et de Services Sociaux de la Montérégie-Centre ( Site 0328)

Greenfield Park, Quebec, Canada

RECRUITING

Centre Hospitalier de l'Université de Montréal ( Site 0326)

Montreal, Quebec, Canada

ACTIVE_NOT_RECRUITING

Centre intégré de cancérologie du CHU de Québec Université Laval, Hôpital de l'Enfant-Jésus ( Site 0327)

Québec, Quebec, Canada

RECRUITING

Centre intégré universitaire de santé et de services sociaux de l'Estrie - Centre Hospitalier Univer ( Site 0329)

Sherbrooke, Quebec, Canada

ACTIVE_NOT_RECRUITING

Eligibility Criteria

See who this study is looking for50 criteria

The trial’s own eligibility text, word for word from the registry. Only the trial site can say who takes part.

Inclusion

  • +Participants with human immunodeficiency virus (HIV) infection must have well controlled HIV on antiretroviral therapy (ART)
  • +Participants who are hepatitis B surface antigen (HBsAg) positive are eligible if they have received hepatitis B virus (HBV) antiviral therapy for at least 4 weeks and have undetectable HBV viral load before randomizationRandomisedWhich group you go into is decided by chance, not by you or your doctor.Read more →
  • +Participants with history of hepatitis C virus (HCV) infection are eligible if HCV viral load is undetectable at ScreeningScreeningThe checks done before joining, to see whether a study fits.Read more →.
  • +Has histologically- or cytologically-confirmed adenocarcinoma of the prostate without small cell histology.
  • +Has prostate cancer progression while on androgen deprivation therapy (or post bilateral orchiectomy) within 6 months before Screening
  • +Has current evidence of distant metastatic disease (M1 disease) documented by either bone lesions on bone scan and/or soft tissue disease by computed tomography/magnetic resonance imaging (CT/MRI).
  • +Has disease that progressed during or after treatment with 1 novel hormonal agent (NHA)
  • +Has ongoing androgen deprivation with serum testosterone \<50 ng/dL (\<1.7 nM)
  • +Has provided tumor tissue from a fresh core or excisional biopsy from soft tissue not previously irradiated
  • +Has an Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 assessed within 7 days of randomization
  • +Has had prior treatment with PARPi or were deemed ineligible to receive treatment by the investigatorPrincipal investigatorThe doctor or researcher responsible for running the study at a site.Read more → or have refused PARPi treatment
  • +Has received prior 177Lu-PSMA-617 or were deemed ineligible to receive 177Lu-PSMA-617 treatment by the investigator or refused 177Lu-PSMA-617 treatment
  • +Participants who have not received cabazitaxel can be enrolledEnrolmentThe number of participants a study plans to include, or has included.Read more → if they are ineligible for cabazitaxel treatment as determined by the investigator or have refused treatment
  • +If participant received first generation anti-androgen therapy before screening, the participant has evidence of disease progression \>4 weeks since the last flutamide treatment and \>6 weeks since the last bicalutamide or nilutamide treatment
  • +Participants receiving bone resorptive therapy (including, but not limited to, bisphosphonate or denosumab) must have been on stable doses for ≥ 4 weeks before the date of randomization
  • +Participants who can produce sperm must agree to the following during the study treatment period and for at least 7 days after the last dose of opevesostat, for at least 30 days after the last dose of abiraterone acetate, and for at least 3 months after the last dose of enzalutamide: EITHER be abstinent OR must agree to use male condom
  • +Has received 1 but no more than 2 taxane-based chemotherapy regimens for metastatic castration-resistant prostate cancer (mCRPC) and has had progressive disease (PD) during or after treatment

Exclusion

  • Has concurrent active HBV or known active HCV infection
  • Has a gastrointestinal disorder that might affect absorption
  • Has a history of pituitary dysfunction
  • Has poorly controlled diabetes mellitus
  • Has clinically significant abnormal serum potassium or sodium level
  • Has a history of active or unstable cardio/cerebro-vascular disease, including thromboembolic events
  • Has a history of seizure within 6 months of providing documented informed consentInformed consentThe process of being told what taking part involves, then choosing freely.Read more → or any condition that may predispose to seizures within 12 months before the date of randomizationRandomisedWhich group you go into is decided by chance, not by you or your doctor.Read more →
  • Has a history of clinically significant ventricular arrhythmias
  • Has received an anticancer monoclonal antibody (mAb) within 4 weeks before the date of randomization, or has not recovered from adverse eventsAdverse eventAny medical problem that happens during a study, whether or not the treatment caused it.Read more → (AEs) due to mAbs administered more than 4 weeks before the date of randomization
  • Has used herbal or medicinal products that may have hormonal anti-prostate cancer activity and/or are known to decrease prostate-specific Antigen (PSA) (eg, saw palmetto, megesterol acetate, citrus pectin polysaccharide) within 4 weeks before the date of randomization
  • Has received radium-223 or Lutetium-177 within 4 weeks before the date of randomization, or has not recovered to Grade ≤1 or baselineBaselineYour starting measurements, taken before treatment begins.Read more → from AEs due to radium-223 or Lutetium-177 administered more than 4 weeks before the date of randomization
  • Has received treatment with 5-αreductase inhibitors (eg, finasteride or dutasteride), estrogens, or cyproterone within 4 weeks before the date of randomization
  • Has received colony-stimulating factors within 28 days before the date of randomization
  • Has received a whole blood transfusion in the last 120 days before the date of randomization. Packed red blood cells and platelet transfusions are acceptable if not given within 28 days of the date of randomization
  • Has received prior targeted small molecule therapy or NHA treatment within 4 weeks before the first dose of study intervention as follows: enzalutamide or apalutamide within 3 weeks or abiraterone acetate + prednisone or darolutamide within 2 weeks
  • Has a "superscan" bone scan
  • Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior the first dose of study medication
  • Has a known additional malignancy that is progressing or has required active treatment within the past 3 years
  • Has known active central nervous system (CNS) metastases and/or carcinomatous meningitis
  • Has an active autoimmune disease that has required systemic treatment in past 2 years
  • Has an active infection requiring systemic therapy
  • Has a history of long QTc syndrome
  • Has any of the following at Screening VisitScreeningThe checks done before joining, to see whether a study fits.Read more →: hypotension (systolic BP \<110 mm Hg) or uncontrolled hypertension (systolic BP ≥160 mm Hg or diastolic BP ≥90 mm Hg, in 2 out of 3 recordings with optimized antihypertensive therapy)
  • Is unable to swallow capsules/tablets
  • Is currently being treated with cytochrome 450-inducing antiepileptic drugs for seizures
  • Received prior systemic anticancer therapy including investigational agents within 4 weeks before the first dose of study intervention
  • Received a live or live-attenuated vaccine within 30 days before the first dose of study intervention
  • Systemic use of the following medications within 2 weeks before the first dose of study intervention: strong CYP3A4 inducers (eg, avasimibe, carbamazepine, lumacaftor, phenobarbital, rifampicin, rifapentine, or St John's Wort); P-gp inhibitors (eg, erythromycin, clarithromycin, rifampicin, ketoconazole, itraconazole, posaconazole, artesunate-pyronaridine, ritonavir, indinavir, nelfinavir, atazanavir, glecaprevir-pibrentasvir, simeprevir, ledipasvir-sofosbuvir, verapamil, diltiazem, dronedarone, propafenone, quinidine, cyclosporine, valspodar, or milk thistle \[Silybum marianum\])
  • Use of aldosterone antagonist (eg, spironolactone, eplerenone) and phenytoin within 4 weeks before the start of the study intervention
  • Has undergone major surgery, including local prostate intervention (except prostate biopsy), within 28 days before the date of randomization, and has not recovered from the toxicities and/or complications
  • Participants who have not adequately recovered from major surgery or have ongoing surgical complications
  • Participants on an unstable dose of thyroid hormone therapy within 6 months before the start of the study intervention
  • Received prior radiotherapy within 2 weeks of start of study intervention, or radiation-related toxicities, requiring corticosteroids
5 concepts to explore on this page · up to 1,300 pointsTap any term to learn what it means.

In plain language

Assembled directly from this trial’s registry record. Every sentence traces to a field below — nothing here is generated or interpreted.

Learning 
What this study is

This study is testing a treatment for a condition.

Phase 3Phase 3A large study comparing a treatment against the current standard.Read more → — a large study comparing this against the current standard, usually across many hospitals.

What is being given or done in this study: Opevesostat, Abiraterone acetate, Enzalutamide, Hydrocortisone, and 3 more.

From the trial registry

Built from these fields:

  • designModule.designInfo.primaryPurpose
  • designModule.phases
  • armsInterventionsModule.interventions[].name
How the study is run

Which group you would be placed in is decided by chance, like a coin flip — not by you and not by your doctor.

This study is open-labelOpen-labelEveryone knows which treatment is being given — nothing is hidden.Read more →: everyone knows which treatment is being given, including you and the study team.

From the trial registry

Built from these fields:

  • designModule.designInfo.allocation
  • designModule.designInfo.maskingInfo.masking
Is there a placebo?

This study does not list a placeboPlaceboA dummy treatment with no active medicine, used for comparison.Read more → group.

One group receives an existing treatment, so the two can be compared.

There are 2 groups in this study.

From the trial registry

Built from this field:

  • armsInterventionsModule.armGroups[].type
Who the study is looking for

The study lists a minimum age of 18 years, with no upper limit given.

The study is open to people of any sex.

The study does not accept healthy volunteersHealthy volunteerSomeone without the condition being studied who takes part anyway.Read more →.

These are the criteria the study lists. Only the trial siteTrial siteA hospital or clinic where a study is actually run.Read more → can decide whether someone can take part.

From the trial registry

Built from these fields:

  • eligibilityModule.minimumAge
  • eligibilityModule.sex
  • eligibilityModule.healthyVolunteers
How big and how long

The study aims to enrol about 1,310 people.

The study is currently expected to finish around February 2030.

The main measurement is taken over: Up to ~54 months.

From the trial registry

Built from these fields:

  • designModule.enrollmentInfo.count
  • statusModule.completionDateStruct.date
  • outcomesModule.primaryOutcomes[].timeFrame
What the study measures

Overall Survival (OS) in Androgen Receptor Ligand Binding Domain (AR LBD) Mutation-Positive Participants — measured over Up to ~54 months.

OS in AR LBD Mutation-Negative Participants — measured over Up to ~54 months.

From the trial registry

Built from these fields:

  • outcomesModule.primaryOutcomes[].measure
  • outcomesModule.primaryOutcomes[].timeFrame

Source: NCT06136624 on ClinicalTrials.gov. The full registry text is further down this page — this summary never replaces it.

Not medical advice. What do these terms mean?

What is being tested — in plain terms

About OpevesostatDrug

Administered orally

From the trial registry — its own words, unedited.

What a drug is here: A medicine — a chemical or small-molecule treatment — given as the thing being studied.

Read the full explanation → · in clinical review

About Abiraterone acetateDrug

Administered orally

From the trial registry — its own words, unedited.

What a drug is here: A medicine — a chemical or small-molecule treatment — given as the thing being studied.

Read the full explanation → · in clinical review

About EnzalutamideDrug

Administered orally

From the trial registry — its own words, unedited.

What a drug is here: A medicine — a chemical or small-molecule treatment — given as the thing being studied.

Read the full explanation → · in clinical review

About HydrocortisoneDrug

Administered orally or IM as a rescue medication

From the trial registry — its own words, unedited.

What a drug is here: A medicine — a chemical or small-molecule treatment — given as the thing being studied.

Read the full explanation → · in clinical review

About Fludrocortisone acetateDrug

Administered orally

From the trial registry — its own words, unedited.

What a drug is here: A medicine — a chemical or small-molecule treatment — given as the thing being studied.

Read the full explanation → · in clinical review

About PrednisoneDrug

Administered orally as a rescue medication

From the trial registry — its own words, unedited.

What a drug is here: A medicine — a chemical or small-molecule treatment — given as the thing being studied.

Read the full explanation → · in clinical review

About DexamethasoneDrug

Administered orally as rescue medication

From the trial registry — its own words, unedited.

What a drug is here: A medicine — a chemical or small-molecule treatment — given as the thing being studied.

Read the full explanation → · in clinical review

Common questions

Answered from this trial’s registry record. Where the record doesn’t say, these answers say so rather than filling the gap.

Am I eligible for this trial?

Only the trial siteTrial siteA hospital or clinic where a study is actually run.Read more → can decide whether someone can take part. Concord cannot make that determination, and neither can any tool that has not examined you.

What the study lists: a minimum age of 18 years.

The full inclusionInclusion criteriaThe things you must have or be for a study to consider you.Read more → and exclusion criteriaExclusion criteriaThe things that would prevent someone from taking part.Read more → are published on this page, exactly as the study team wrote them.

The useful next step is to bring this trial to your doctor. Answering a few questions first gives them something concrete to review.

From the trial registry
  • eligibilityModule.minimumAge
  • eligibilityModule.eligibilityCriteria
Is there a placebo?

This study does not list a placeboPlaceboA dummy treatment with no active medicine, used for comparison.Read more → group.

One group receives an existing treatment so the two can be compared.

From the trial registry
  • armsInterventionsModule.armGroups[].type
Would I know which treatment I am getting?

This study is open-labelOpen-labelEveryone knows which treatment is being given — nothing is hidden.Read more →: everyone knows which treatment is being given, including you and the study team.

Which group you would be placed in is decided by chance, like a coin flip — not by you and not by your doctor.

From the trial registry
  • designModule.designInfo.maskingInfo.masking
  • designModule.designInfo.allocation
Who can join?

The study lists a minimum age of 18 years, with no upper limit given.

It is open to people of any sex.

It does not accept healthy volunteersHealthy volunteerSomeone without the condition being studied who takes part anyway.Read more →.

Only the trial siteTrial siteA hospital or clinic where a study is actually run.Read more → can confirm whether a particular person can take part.

From the trial registry
  • eligibilityModule.minimumAge
  • eligibilityModule.sex
  • eligibilityModule.healthyVolunteers
How long would this take?

The study's main measurement is taken over: Up to ~54 months.

The study as a whole is currently expected to finish around 2030-02-15.

How long any one person takes part can differ from the study length. The study team can tell you what the schedule looks like in practice.

From the trial registry
  • outcomesModule.primaryOutcomes[].timeFrame
  • statusModule.completionDateStruct.date
How many people are taking part?

The study aims to enrol about 1,310 people.

From the trial registry
  • designModule.enrollmentInfo.count
Where is this happening?

This study lists 13 locations, including: Edmonton, Alberta, Canada; Ottawa, Ontario, Canada; Toronto, Ontario, Canada; Greenfield Park, Quebec, Canada; Montreal, Quebec, Canada; Québec, Quebec, Canada, and 7 more.

Sites can open and close during a study, so confirm with the team before travelling.

From the trial registry
  • trial_locations

About This Trial

This is a phase 3, randomized, open-label study of opevesostat compared to alternative abiraterone acetate or enzalutamide in participants with metastatic castration-resistant prostate cancer (mCRPC) with respect to overall survival (OS) in participants with mCRPC previously treated with next-generation hormonal agent (NHA) and taxane-based chemotherapy. It is hypothesized that opevesostat is superior with respect to OS in androgen receptor ligand binding domain (AR LBD) mutation-negative and -positive participants.

Other Sites (6)

Henry Ford Hospital ( Site 0015)

Detroit, Michigan, United States

Avera Cancer Institute - Marshall ( Site 0122)

Marshall, Minnesota, United States

M Health Fairview Clinics and Surgery Center ( Site 0019)

Minneapolis, Minnesota, United States

Metro-Minnesota Community Clinical Oncology ( Site 0014)

Saint Louis Park, Minnesota, United States

James J. Peters VA Medical Center ( Site 0088)

The Bronx, New York, United States

Fred Hutchinson Cancer Center ( Site 0013)

Seattle, Washington, United States

Worth passing on?

Save it to the Care Package and send it to them, or to their doctor, in one message. Whether they follow it up is theirs to decide.

Review the Care Package

This page is for informational purposes only and does not constitute medical advice. Clinical trial eligibility can only be determined by the trial site after proper screening. Trial information is sourced from ClinicalTrials.gov and may not reflect the most current status. Always consult your healthcare provider before making decisions about clinical trial participation.