Active, not recruitingNCT06353386ClinicalTrials.gov record

Substudy 01A: Safety and Efficacy of Opevesostat (MK-5684)-Based Treatment Combinations or Opevesostat Alone in Participants With Metastatic Castration-resistant Prostate Cancer (mCRPC) (MK-5684-01A)

Prostatic Neoplasms, Castration-Resistant

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THE QUICK READ

What this study involves

The registry does not currently label this study as recruiting. Ask about its status before planning a screening visit.

Study type: Interventional
Phase: Phase 1 / Phase 2
Age range: 18 years - Not specified
Sex eligible: All sexes
Healthy volunteers: Not accepted
Participants: 220 Estimated

These are starting points, not an eligibility decision. The research team must review the full requirements.

About the research

Substudy 01A is part of a larger research study that is testing experimental treatments for metastatic castration-resistant prostate cancer (mCRPC). The larger study is the umbrella study (U01).

The goal of substudy 01A is to evaluate the safety and efficacy of opevesostat-based treatment combinations, or as a single agent, in participants with mCRPC.

This substudy will have two phases: a safety lead-in phase and an efficacy phase. The safety lead-in phase will be used to evaluate the safety and tolerability, and to establish a recommended Phase 2 dose (RP2D) for the opevesostat-based treatment combinations. There will be no hypothesis testing in this study.

Who may be able to participate?

The list below is the sponsor’s full registry wording. It can include conditions, prior treatment, test results and other requirements. A match in search does not mean you qualify.

Inclusion Criteria:

The main inclusion criteria include but are not limited to the following:

Histologically or cytologically confirmed diagnosis of adenocarcinoma of the prostate without small cell histology.
Prostate cancer progression and received androgen deprivation therapy (ADT) or post bilateral orchiectomy within 6 months before screening.
Evidence of disease progression from either, \>4 weeks from last flutamide treatment, or \>6 weeks from last bicalutamide or nilutamide treatment, if receiving first generation anti-androgen therapy as last treatment therapy.
Current evidence of metastatic disease.
Prior treatment with 1 to 2 novel hormonal agent(s) (NHA) for non-metastatic, or metastatic, hormone-sensitive prostate cancer or castration-resistant prostate cancer and have disease progression during or after treatment.
Treatment with bone resorptive therapy (including, but not limited to, bisphosphonate or denosumab) must have been on stable doses for \>4 weeks before randomization.
Participants who experienced adverse events (AEs) due to previous anticancer therapies must have recovered to \<Grade 1 or baseline.
Human immunodeficiency virus (HIV)-infected participants must have well controlled HIV on antiretroviral therapy.
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.
Participants with a history of Hepatitis C virus (HCV) infection are eligible if HCV viral load is undetectable.

Exclusion Criteria:

The main exclusion criteria include but are not limited to the following:

History of pituitary dysfunction.
Poorly controlled diabetes mellitus.
Active or unstable cardio/cerebro-vascular disease, including thromboembolic events and history of stroke or transient ischemic attack within 6 months before the first dose of study intervention, history of myocardial infarction within 6 months before the first dose of study intervention, New York Heart Association Class III or IV cardiac disease or congestive heart failure, coronary heart disease that is symptomatic, or unstable angina
History or family history of long corrected QT interval (QTc) syndrome.
Myelodysplastic syndrome (MDS)/acute myeloid leukemia (AML) or features suggestive of MDS/AML.
History or current condition of adrenal insufficiency.
History of (noninfectious) pneumonitis requiring steroids, or current pneumonitis.
HIV-infected participants with a history of Kaposi's sarcoma and/or Multicentric Castleman's Disease.
Undergone major surgery, including local prostate intervention (except prostate biopsy) within 28 days before randomization, and has not recovered from the toxicities and/or complications.
Is on an unstable dose of thyroid hormone therapy within 6 months prior to first dose of study intervention.
Received a whole blood transfusion in the last 120 days before randomization (packed red blood cells and platelet transfusions are acceptable if not given within 28 days before randomization).
Received prior systemic anticancer therapy including investigational agents within 4 weeks before randomization.
Received prior radiotherapy within 2 weeks of start of study intervention or radiation-related toxicities, requiring corticosteroids.
Received a live or live-attenuated vaccine within 30 days before the first does of study intervention. Administration of killed vaccines is allowed.
Diagnosis of immunodeficiency, or is receiving chronic systemic steroid therapy, or any other form of immunosuppressive therapy, within 7 days prior to the first dose of study intervention.
Known additional malignancy that is progressing or has required active treatment within the past 3 years.
Known active central nervous system (CNS) metastases and/or carcinomatous meningitis.
Active autoimmune disease that has required systemic treatment in the past 2 years.
Active infection requiring systemic therapy.
Concurrent active HBV or HCV infections.

Understand screening

Treatment, groups and participation

The registry may describe treatments and study duration without a complete visit calendar. Ask the study team for the exact schedule, procedures, risks, costs and alternatives. Keep your usual care plan unless your treating clinician tells you otherwise.

Assignment: Random assignment
Masking: No masking

Arm A1: Opevesostat

Participants receive 5 mg of opevesostat twice daily (BID) via oral tablet plus dexamethasone 1.5 mg by oral tablets once daily (QD) and 0.1 mg fludrocortisone acetate by oral tablet QD until progression or discontinuation.

Drug: Opevesostat · Drug: Fludrocortisone acetate · Drug: Dexamethasone

Arm A2: Olaparib + Opevesostat

Participants receive 5 mg of opevesostat BID via oral tablet plus dexamethasone 1.5 mg by oral tablets QD and 0.1 mg fludrocortisone acetate by oral tablet QD, PLUS 300 mg of olaparib BID via oral tablet until progressive disease or discontinuation.

Drug: Opevesostat · Drug: Olaparib · Drug: Fludrocortisone acetate · Drug: Dexamethasone

Arm A3: Docetaxel + Opevesostat

Participants receive 5 mg of opevesostat BID via oral tablet plus dexamethasone 1.5 mg by oral tablets QD and 0.1 mg fludrocortisone acetate by oral tablet QD, PLUS 75 mg/m\^2 of docetaxel once every 3 weeks (Q3W) via IV infusion, plus prednisone per approved product label BID by oral tablets until progressive disease or discontinuation.

Drug: Opevesostat · Drug: Docetaxel · Drug: Fludrocortisone acetate · Drug: Dexamethasone · Drug: Prednisone

Arm A4: Cabazitaxel + Opevesostat

Participants receive 5 mg of opevesostat BID via oral tablet plus dexamethasone 1.5 mg by oral tablets QD and 0.1 mg fludrocortisone acetate by oral tablet QD, PLUS 20 mg/m\^2 of cabazitaxel Q3W via IV infusion, plus prednisone per approved product label BID by oral tablets until progressive disease or discontinuation.

Drug: Opevesostat · Drug: Cabazitaxel · Drug: Fludrocortisone acetate · Drug: Dexamethasone · Drug: Prednisone

Opevesostat DRUG

Oral Tablet

Olaparib DRUG

Oral Tablet

Docetaxel DRUG

IV Infusion

Cabazitaxel DRUG

IV Infusion

Fludrocortisone acetate DRUG

Oral Tablet

Dexamethasone DRUG

Oral Tablet

Prednisone DRUG

Oral Tablet

Prepare your questions

What researchers are measuring

Outcome measures describe what is being studied. They are not proof that a treatment works.

Primary measures

Number of participants who experience one or more dose-limiting toxicities (DLTs)

Time frame: Up to approximately 28 days

The following events, if considered drug related by the investigator, will be considered a DLT: Grade 4 nonhematologic toxicity (not laboratory value); Grade 4 hematologic toxicity lasting \>7 days, except thrombocytopenia (Grade 4 thrombocytopenia of any duration, Grade 3 thrombocytopenia associated with clinically significant bleeding); Any nonhematologic adverse event (AE) \>Grade 3 in severity should be considered a DLT (with exceptions); Any Grade 3 or Grade 4 nonhematologic laboratory value (if certain criteria are met); Febrile neutropenia Grade 3 or Grade 4; Prolonged delay (\>2 weeks) in initiating treatment after the first 28 days due to study intervention-related toxicity; Missing \>25% of study intervention doses as a result of drug-related AE(s) during the first 28 days; Grade 5 toxicity.

Number of participants who experience one or more adverse events (AEs)