A Safety Study of JNJ-56021927 in Participants With Metastatic Castration-Resistant Prostate Cancer

Study Overview
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Brief Summary
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The purpose of this study is to evaluate the safety and tolerability of JNJ-56021927 in Japanese participants with metastatic castration-resistant prostate cancer (mCRPC- prostate cancer that is resistant to medical [for example. hormonal] or surgical treatments).

Detailed Description
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This is a Phase 1, multicenter, open-label (participants will know the identity of study drug received) study in participants with Metastatic Castration-Resistant Prostate Cancer (mCRPC). The study consists of 4 parts: Screening (28 days before study commences on Day 1), pharmacokinetic week (PK), Continuous daily dosing, Extension and Safety follow-up period. In PK week participants will receive a single oral capsule of JNJ-56021927 at a dose of 240 milligram (mg) on Day 1 and will be monitored for 1 week. After Week 1, in continuous daily dosing period, participants will receive continuous daily therapy at the same dose for 4 weeks (Cycle 1). After Cycle 1 participants, who will not meet the criteria for discontinuation listed such as progressive disease (PD) or unacceptable toxicity, will continue in safety follow-up period and will receive continuous daily therapy at the same dose up to cycle 13. Primarily dose limiting toxicity (DLT) will be evaluated. Participants' safety will be monitored throughout.

Official Title
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A Phase 1 Study of Androgen Receptor (AR) Antagonist JNJ-56021927 in Subjects With Metastatic Castration-Resistant Prostate Cancer

Conditions
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Prostatic Neoplasms, Castration-Resistant

Intervention / Treatment
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* Drug: JNJ-56021927


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Histologically or cytologically confirmed adenocarcinoma of the prostate without neuroendocrine differentiation or small cell features, with metastatic disease Castration-resistant prostate cancer (CRPC) demonstrated during continuous androgen deprivation therapy (ADT)/post orchiectomy Maintain castrate levels of testosterone (less than [<] 50 nanogram per deciliter (ng/dL) [1.72 nanomol per liter {nmol/L}]) within 4 weeks before enrollment Prostate-specific antigen (PSA) evidence for progressive prostate cancer consists of a PSA level of at least greater than or equal to (>=) 2 nanogram per milliliter (ng/mL) within 2 weeks before enrollment which has risen on at least 2 successive occasions, at least 1 week apart. If the confirmatory PSA value is less than the last PSA value, then an additional test for rising PSA will be required to document progression Participants who received a first generation anti-androgen [for example, bicalutamide, flutamide, nilutamide (not approved in Japan)] as part of an initial combined androgen blockade therapy or as second-line hormonal therapy must show continuing disease progression off the anti-androgen for at least 4 weeks prior to the first dose of study drug Exclusion Criteria: History of, or current metastases in the brain or untreated spinal cord compression Participants with progressive epidural disease Participants has a history of another malignancy within 5 years before screening Prior treatment with second generation anti-androgens ( for example, enzalutamide) or Cytochrome P450 17 (CYP 17) inhibitors [for example, abiraterone acetate, orteronel, galeterone, systemic ketoconazole (not approved in Japan, respectively)] Participants had used radiopharmaceutical agents (for example, Strontium-89) or investigational immunotherapy (for example, sipuleucel-T) within 12 weeks before the first dose of study drug

Ages Eligible for Study
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Minimum Age: 20 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Cohort 1<br>Participants will receive 8 capsules of JNJ-56021927, 240 milligram (mg) as single oral dose on Day 1. After participants will receive daily JNJ-56021927, 240 mg on Day 1 of Cycle 1 until disease progression, unacceptable toxicity, withdrawal of consent or death, whichever comes first. | Drug: JNJ-56021927<br>* Participants will receive 8 capsules of JNJ-56021927, 240 milligram (mg) as single oral dose on Day 1. After participants will receive daily JNJ-56021927, 240 mg on Day 1 of Cycle 1 until disease progression, unacceptable toxicity, withdrawal of consent or death, whichever comes first.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Number of Participants With Dose Limiting Toxicity | The dose will be considered intolerable if a participants developed either any Grade 3 or 4 non-hematologic toxicity; GI toxicities such as abdominal pain, nausea, vomiting, constipation, and diarrhea, must persist at Grade 3-4 despite maximal medical therapy, Grade 4 neutropenia (that is, ANC less than [<] 500 per microliter [mcL] for five or more consecutive days, Grade 4 thrombocytopenia (<25,000 per mcL) or Grade 3 thrombocytopenia (greater than or equal to [>=] 25,000 - <50,000 per mcL) with a bleeding episode requiring platelet transfusion, any other Grade 4 hematologic toxicity of more than 5 days duration, any grade treatment-related seizure, the other toxicities which do not meet any of the above criteria but which, in the opinion of the Investigator, are equivalent to DLTs. | Week 1 up to Day 28 of Cycle 1 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Maximum Observed Plasma Concentration (C[max]) | The C(max) is the maximum plasma concentration which will be observed at the defined time points. | Pre-dose, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 24, 48, 72 and 96 hours post administration of study drug | 
| Time to Reach the Maximum Plasma Concentration (T[max]) | The T[max] is time to reach the observed maximum plasma concentration. | Pre-dose, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 24, 48, 72 and 96 hours post administration of study drug | 
| Elimination Half-life (t1/2[lambda]) | Elimination half-life associated with the terminal slope (lambda[z]) of the semi logarithmic drug concentration-time curve, calculated as 0.693/lambda (z). | Pre-dose, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 24, 48, 72 and 96 hours post administration of study drug | 
| Area Under the Plasma Concentration-Time Curve From Time Zero to 24 Hours | The AUC (0-24) is the area under the plasma concentration-time curve from time zero to 24 hours. | Pre-dose, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 24, 48, 72 and 96 hours post administration of study drug | 
| Area Under the Plasma Concentration-Time Curve From Time Zero to Infinite Time (AUC [0-last]) | The AUC (0-last) is the area under the plasma concentration-time curve from time zero time of the last quantifiable concentration C(last), and C(last) is the last observed quantifiable concentration. | Pre-dose, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 24, 48, 72 and 96 hours post administration of study drug | 
| Area Under the Plasma Concentration-Time Curve From Time Zero to Infinite Time (AUC [0-infinity]) | The AUC (0-infinity) is the area under the plasma concentration-time curve from time zero to infinite time, calculated as the sum of AUC(0-last) and C(last)/lambda(z), wherein AUC(0-last) is area under the plasma concentration-time curve from time zero to last quantifiable time; and C(last) is the last observed quantifiable concentration; and lambda(z) is elimination rate constant. | Pre-dose, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 24, 48, 72 and 96 hours post administration of study drug | 
| Change in Prostate-specific Antigen (PSA) | Change in prostate specific antigen will be assessed using the Prostate Cancer Working Group 2 (PCWG2) criteria and Response Criteria in Solid Tumors (RECIST). PSA progression will delayed if decline from baseline: greater than or equal to (>=) 25 percent (%) and >= 2 nanogram per milliliter (ng/mL) above the PSA nadir, which is confirmed by a second value 3 or more weeks later; and no decline from baseline: PSA progression >= 25% and >= 2 ng/mL after 12 weeks. | Baseline, Day 1 of each cycle (28 days) until disease progression and up to 28 days after the last dose study drug | 
| Trough Plasma Concentration (C[trough]) | Trough plasma concentration (C[trough]) just before dosing will be assessed. | Pre- dose on Day 1 of Cycle 2 up to Cycle 13 | 
| Observed Accumulation Index (A[cc] Index) | Observed Accumulation Index (A[cc] Index) will be calculated as AUC[0-24] at steady state divided by AUC[0-24]. | Pre-dose, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 24, 48, 72 and 96 hours post administration of study drug in Cycle 1 | 
| Effective Half-life (EHL) | Effective Half-life (EHL) will be calculated as dosing interval minus log 2 divided by log {1-[1/A[cc]Index}. | Pre-dose, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 24, 48, 72 and 96 hours post administration of study drug in Cycle 1 | 
| Percent Peak to Trough Fluctuation (PTF) | Percent Peak to Trough Fluctuation (PTF) will be calculated as 100 multiplied by {C[max]/C[min]}. | Pre-dose, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 24, 48, 72 and 96 hours post administration of study drug in Cycle 1 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Prostatic Neoplasms, Castration-Resistant, Metastatic Castration-Resistant Prostate Cancer, Prostate Cancer, Androgen Receptor, JNJ-56021927