Clinical trial NCT01650194: A Study to Determine Safety and Tolerability of Enzalutamide (MDV3100) in Combination With Abiraterone Acetate in Bone Metastatic Castration-Resistant Prostate Cancer Patients
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
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: PHASE2
Conditions: Metastatic Castration-Resistant Prostate Cancer
Keywords: abiraterone acetate
prednisone
enzalutamide
cancer
prostate
MDV3100
Lead sponsor: Astellas Pharma Inc
Sponsor class: INDUSTRY
Collaborators: name: Medivation LLC, a wholly owned subsidiary of Pfizer Inc.
First posted: 2012-07-26
Enrollment: 60
Sex: MALE
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: NA
Intervention model: SINGLE_GROUP
Primary purpose: TREATMENT

Brief summary: The purpose of this study was to explore the safety and tolerability of enzalutamide in combination with abiraterone acetate plus prednisone. Subjects diagnosed with cancer of the prostate that was getting worse and spreading to the bone despite receiving hormone treatment were enrolled and received study treatment until disease progression.

Detailed description: For the study duration, all subjects maintained androgen deprivation with a gonadotropin releasing hormone (GnRH) agonist or antagonist or orchiectomy. Study drug was administered until disease progression. Disease progression was 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.

Eligibility criteria: 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

Primary outcomes:
measure: Number of Participants With Adverse Events (AEs)
timeFrame: From the first dose of study drug administration up 30 days following the last dose of study drug date, with a median duration of treatment of 10.1 months.
Secondary outcomes:
measure: Change From Baseline in Testosterone Concentration in Bone Marrow Aspirate
timeFrame: Baseline and Week 9
measure: Change From Baseline in Dihydrotestosterone (DHT) Concentration in Bone Marrow Aspirate
timeFrame: Baseline and Week 9
measure: Change From Baseline in Cortisol in Bone Marrow Aspirate
timeFrame: Baseline and Week 9
measure: Change From Baseline in Androstenedione in Bone Marrow Aspirate
timeFrame: Baseline and Week 9
measure: Change From Baseline in Progesterone in Bone Marrow Aspirate
timeFrame: Baseline and Week 9
measure: Change From Baseline in Pregnenolone in Bone Marrow Aspirate
timeFrame: Baseline and Week 9
measure: Change From Baseline in Testosterone Concentration in Blood
timeFrame: Baseline and Week 9
measure: Change From Baseline in DHT Concentration in Blood
timeFrame: Baseline and Week 9
measure: Change From Baseline in Cortisol Concentration in Blood
timeFrame: Baseline and Week 9
measure: Change From Baseline in Androstenedione Concentration in Blood
timeFrame: Baseline and Week 9
measure: Change From Baseline in Progesterone Concentration in Blood
timeFrame: Baseline and Week 9
measure: Change From Baseline in Pregnenolone Concentration in Blood
timeFrame: Baseline and Week 9
measure: Change From Baseline to End-of-Treatment (EoT) in Prostate-Specific Antigen (PSA) Levels
timeFrame: Baseline and EoT; the median duration of treatment was 10.1 months.
measure: Progression Free Survival (PFS)
timeFrame: Up to 1849 days
measure: Percentage of Participants With Objective Response for Soft Tissue Lesions According to Response Evaluation Criteria in Solid Tumors 1.1 (RECIST)
timeFrame: Up to 1849 days
measure: Bone Scan Response at EoT
timeFrame: EoT; the median duration of treatment was 10.1 months.
measure: Change From Baseline to EoT in Bone Specific Alkaline Phosphatase
timeFrame: Baseline and EoT; the median duration of treatment was 10.1 months.
measure: Change From Baseline in Urine N-Telopeptide
timeFrame: Baseline and Week 9
Other outcomes:
measure: 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
timeFrame: Baseline and Week 9
Locations:
city: Houston
country: United States
facility: Site US2492 MD Anderson Cancer Ctr
state: Texas
Study officials:
affiliation: Astellas Pharma Global Development
name: Associate Medical Director
role: STUDY_DIRECTOR
References:
citation: Assi R, Temraz S, Shamseddine A, Mukherji D. New Compounds Targeting the Androgen Receptor for Treatment of Advanced Prostate Cancer. Curr Drug Targets. 2016;17(3):290-302. doi: 10.2174/1389450116666150907101044.