This trial is active, not recruiting.

Condition metastatic castration-resistant prostate cancer
Treatments enzalutamide, abiraterone acetate, prednisone
Phase phase 2
Target androgen receptor
Sponsor Astellas Pharma Global Development, Inc.
Collaborator Medivation, Inc.
Start date July 2012
End date September 2017
Trial size 60 participants
Trial identifier NCT01650194, 9785-CL-0011


The purpose of this study is to explore the safety and tolerability of enzalutamide in combination with abiraterone acetate plus prednisone. Subjects diagnosed with cancer of the prostate that is getting worse and spread to the bone despite receiving hormone treatment will be enrolled and receive study treatment until disease progression.

United States No locations recruiting
Other countries No locations recruiting

Study Design

Intervention model single group assignment
Primary purpose treatment
Masking no masking
Enzalutamide daily, abiraterone acetate daily, prednisone twice daily
enzalutamide MDV3100
abiraterone acetate

Primary Outcomes

Nature, frequency and severity of adverse events
time frame: Until documented disease progression (up to 24 months)
Safety assessed by laboratory tests, vital signs, 12 lead electrocardiograms (ECGs) and physical examinations
time frame: Until documented disease progression (up to 24 months)

Secondary Outcomes

Androgen receptor signaling assessed by expression and localization of androgen receptor (AR), CYP17 expression, splice variants, and pathways linked with non-classical AR signaling and bone development
time frame: Baseline and Week 9
Androgens including testosterone and dihydrotestosterone (DHT) concentrations in bone marrow aspirate and blood
time frame: Baseline and Week 9
Androgen pre-cursors including cortisol, androstenedione, pregnenolone, progesterone
time frame: Baseline and Week 9
Prostate-specific antigen (PSA) levels)
time frame: 24 months
Progression free survival (PFS)
time frame: 24 months
Objective response according to Response Evaluation Criteria in Solid Tumors 1.1 (RECIST)
time frame: 24 months
Bone scan results
time frame: Week 13, Week 25 and every subsequent 12 weeks (up to 24 months)
Bone specific alkaline phosphatase
time frame: 24 months
Urine N-telopeptides
time frame: Baseline and Week 9

Eligibility Criteria

Male participants of any age.

Inclusion Criteria: - Histologically or cytologically confirmed adenocarcinoma of the prostate without neuroendocrine differentiation or small cell features - Presence of metastatic disease to the bone - Ongoing androgen deprivation therapy with a gonadotropin releasing hormone (GnRH) analogue or orchiectomy (i.e., surgical or medical castration) - Subject receiving bisphosphonate or denosumab therapy must have been on stable doses for at least 4 weeks prior to Day 1 - Progressive disease defined as one or more of the following three criteria (Note: subjects who received an antiandrogen must demonstrate disease progression following discontinuation of antiandrogen): - PSA progression defined by a minimum of two rising PSA levels with an interval of ≥ 1 week between each determination. The PSA value at the Screening visit should be ≥ 2 ng/mL - Soft tissue disease progression as defined by the Response Evaluation Criteria in Solid Tumors (RECIST 1.1) - Bone disease progression defined by PCWG2 criteria (two or more new lesions on bone scan compared with prior scan) - Subject previously treated with chemotherapy must have no more than two prior chemotherapy regimens for the treatment of metastatic prostate cancer - Eastern Cooperative Oncology Group (ECOG) performance status of 0-2 - Agree to use a double-barrier method of contraception which involves the use of a condom in combination with one of the following: contraceptive sponge, diaphragm, or cervical ring with spermicidal gel or foam, if having sex with a woman of child-bearing potential during the length of the study and for one week after abiraterone is discontinued and for at least three months after enzalutamide is discontinued - Subject agrees not to participate in another interventional study while on treatment Exclusion Criteria: - Known or suspected metastases in the brain - Absolute neutrophil count < 1,000/μL, platelet count < 75,000/μL, and hemoglobin < 9 g/dL (NOTE: subject may not have received any growth factors or blood transfusions within seven days of the hematologic laboratory values obtained at the Screening visit) - Total bilirubin (TBL), alanine aminotransferase (ALT) or aspartate aminotransferase (AST) > 2.5 times the upper limit of normal - Creatinine (Cr) > 2 mg/dL - Treatment with androgen receptor antagonists (bicalutamide, flutamide, nilutamide), 5-α reductase inhibitors (finasteride, dutasteride), estrogens, chemotherapy, or biologic therapy within 4 weeks of Day 1 visit - Radiation therapy within 3 weeks (if single fraction of radiotherapy within 2 weeks) of Day 1 visit, or radionuclide therapy within 8 weeks of Day 1 - Planned palliative procedures for alleviation of bone pain such as radiation therapy or surgery - Structurally unstable bone lesions suggesting impending fracture - History of seizure or any condition that may predispose to seizure including, but not limited to underlying brain injury, stroke, primary brain tumors, brain metastases, or alcoholism. Also, history of loss of consciousness or transient ischemic attack within 12 months of enrollment (Day 1 visit) - Clinically significant cardiovascular disease including: - Myocardial infarction within 6 months of Screening visit; - Uncontrolled angina within 3 months of Screening visit; - Congestive heart failure New York Heart Association (NYHA) class 3 or 4, or subjects with history of congestive heart failure NYHA class 3 or 4 in the past, or history of anthracycline or anthracenedione (mitoxantrone) treatment, unless a screening echocardiogram or multi-gated acquisition scan (MUGA) performed within three months of the Screening visit results in a left ventricular ejection fraction that is ≥ 45% - History of clinically significant ventricular arrhythmias (e.g., ventricular tachycardia, ventricular fibrillation, torsade de pointes) - Prolonged corrected QT interval by the Fridericia correction formula (QTcF) on the Electrocardiogram (ECG) > 470 msec. - History of Mobitz II second degree or third degree heart block without a permanent pacemaker in place - Hypotension (systolic blood pressure < 86 mmHg or bradycardia with a heart rate of <50 beats per minute on the ECG., unless pharmaceutically induced and thus reversible (i.e. beta blockers). - Uncontrolled hypertension as indicated by a resting systolic blood pressure >170 mmHg or diastolic blood pressure >105 mmHg - Prior use of ketoconazole, abiraterone acetate or enzalutamide, or participation in a previous clinical trial of ketoconazole, abiraterone acetate or enzalutamide - History of significant bleeding disorder unrelated to cancer, including: - Diagnosed congenital bleeding disorders (e.g., von Willebrand's disease) - Diagnosed acquired bleeding disorder within one year (e.g., acquired anti-factor VIII antibodies) of Screening visit - History of GI bleeding within 6 months of Screening visit - Active or symptomatic viral hepatitis or chronic liver disease - Known history of pituitary or adrenal dysfunction

Additional Information

Official title A Phase 2 Study Determining Safety and Tolerability of Enzalutamide (Formerly MDV3100) in Combination With Abiraterone Acetate in Bone Metastatic Castration-Resistant Prostate Cancer Patients
Description For the study duration, all subjects will maintain androgen deprivation with a gonadotropin releasing hormone (GnRH) agonist or antagonist or orchiectomy. Study drug will be administered until disease progression. Disease progression is defined as a composite endpoint consisting of either clinical deterioration, radiographic progression or prostate-specific antigen (PSA) progression according to the Prostate Cancer Clinical Trials Working Group 2 (PCWG2) criteria.
Trial information was received from ClinicalTrials.gov and was last updated in February 2017.
Information provided to ClinicalTrials.gov by Astellas Pharma Inc.