A Study to Evaluate the Effect of Multiple Doses of JNJ-56021927 on the Pharmacokinetics of Multiple Cytochrome P450 and Transporter Substrates in Participants With Castration-Resistant Prostate Cancer

This is a Phase 1, multicenter, open-label study in participants with CRPC. The study will consist of a Screening Phase to determine eligibility, a Pretreatment Phase, a Treatment Phase, and a Follow-up Phase. The study is designed to estimate the magnitude of the effects of JNJ-56021927 on the pharmacokinetics of probe substrates. In vitro studies have indicated that JNJ-56021927 and its active metabolite JNJ-56142060 (M3) have the potential to affect multiple cytochrome P450 (CYP) enzymes (CYP3A4, CYP2C9, CYP2C19, and CYP2C8) and drug transporters proteins (P-glycoprotein [P-gp] and breast cancer resistance protein [BRCP]) via inhibition or induction. In human hepatocytes, JNJ 56021927 and JNJ-56142060 (M3) were found to be inducers of CYP3A4. The induction of CYP3A4 suggests that JNJ-56021927 and M3 will induce other CYP isozymes and drug transporters (eg, CYP2C and P-gp via activation of pregnane X receptor). The study is designed to confirm the in vivo significance of these non-clinical findings.

Inclusion criteria

• Eastern Cooperative Oncology Group (ECOG) performance status score of 0, 1, or 2
• Adenocarcinoma of the prostate
• Participants with non-metastatic castration-resistant prostate cancer (NM-CRPC) or metastatic castration-resistant prostate cancer (mCRPC), who in the opinion of the investigator may benefit from treatment with JNJ-56021927
• Surgically or medically castrated, with testosterone levels of <50 nanogram per deciliter (ng/dL)
• If the participant is being treated with a gonadotropin-releasing hormone (GnRHa) (ie, participant who has not undergone bilateral orchiectomy), then this therapy must have been initiated at least 4 weeks prior to the Cycle 1 Day 1 visit and must be continued throughout the study
• Adequate bone marrow and organ function defined as: Hemoglobin (>=9.0 g/dL, independent of transfusion or growth factor support within the prior 7 days); Absolute neutrophil count (>=1000/mm^3 independent of growth factor support within the prior 7 days); Platelet count (>=75,000/mm^3 independent of transfusion or growth factor support within the prior 7 days); Serum albumin (>=3.0 g/dL); Serum creatinine (<=1.5*upper limit of normal (ULN) or calculated creatinine clearance >=50 mL/min/1.73m^2); Total bilirubin [<1.5*ULN (participants with Gilbert's Syndrome may be enrolled if the total bilirubin is <4 mg/dL with predominance of indirect bilirubin >=80% of total bilirubin]); Aspartate aminotransferase or alanine aminotransferase (<=3.0*ULN); Prothrombin time (PT) or partial thromboplastin time (PTT) or international normalized ratio (INR) (PT <=15 sec or INR <=1.2 PTT <=40 sec).

Exclusion criteria

• Known brain metastases
• Chemotherapy or immunotherapy for the treatment of prostate cancer within 4 weeks of the Study Day 15 (Cycle 1 Day 1) visit
• Prior treatment with enzalutamide within 8 weeks before first dose of drug probes
• Therapies that must be discontinued or substituted prior to study visit Day 1, or must be temporarily interrupted during the course of the study, include the following: a) Medications known to lower the seizure threshold within 4 weeks before Study Day 15 (Cycle 1 Day 1) and b) Medications known to induce or inhibit drug metabolizing enzymes (CYP3A4, CYP2C9, CYP2C19 and CYP2C8) or transporter proteins (P-gp, BRCP, OATP1B1, and OATPB3)
• Participant has known allergies, hypersensitivity, or intolerance to any of the study drugs/drug probes or excipients
• History of seizure or any condition that may predispose to seizure within 12 months prior to enrollment (Study Day 1); brain arteriovenous malformation; or intercranial masses such as schwannoma or meningioma that is causing edema or mass effect
• Participants with poor metabolizer genotype for CYP2C9 (*2, *3), or CYP2C19 (*2, *3, *4, *8)