A Phase I/II Trial of Enzalutamide Plus the Glucocorticoid Receptor Antagonist Mifepristone for Patients With Metastatic Castration Resistant Prostate Cancer (CRPC)
Overview
- Phase
- Phase 1
- Intervention
- enzalutamide
- Conditions
- Hormone-resistant Prostate Cancer
- Sponsor
- University of Chicago
- Enrollment
- 88
- Locations
- 4
- Primary Endpoint
- PSA Progression-free Survival
- Status
- Completed
- Last Updated
- 3 years ago
Overview
Brief Summary
This partially randomized phase I/II trial studies the side effects and best dose of enzalutamide and mifepristone when given together and to see how well they work in treating patients with metastatic hormone resistant prostate cancer. Androgens can cause the growth of prostate cancer cells. Antihormone therapy, such as enzalutamide and mifepristone, may lessen the amount of androgens made by the body. It is not yet known whether enzalutamide is more effective with or without mifepristone in treating patients with prostate cancer.
Detailed Description
PRIMARY OBJECTIVES: I. To establish the safe and pharmacologically active doses of mifepristone and enzalutamide to use in combination. (Phase I) II. To determine if mifepristone in combination with enzalutamide prolongs time to prostate-specific antigen (PSA) progression compared to enzalutamide alone in patients with metastatic castration resistant prostate cancer. (Phase II) SECONDARY OBJECTIVES: I. To evaluate the effect of mifepristone on endocrine biomarkers such as serum cortisol and thyrotropin. II. To determine the effect of mifepristone on enzalutamide clearance and steady state enzalutamide exposure. III. To determine if mifepristone affects PSA response rate when added to enzalutamide. IV. To determine if mifepristone when added to mifepristone prolongs radiographic and clinical progression free survival according to standard working group criteria. V. To explore the role of glucocorticoid receptor (GR) and androgen receptor (AR) protein expression within circulating tumor cells as a pharmacodynamic biomarker for mifepristone and enzalutamide in castration resistant prostate cancer (CRPC). VI. To explore the expression of GR and down-stream AR/GR targets in metastatic tumor specimen prior to combination drug administration and at clinical progression. OUTLINE: This is a phase I, dose-escalation study followed by a phase II study. PHASE I: Patients receive enzalutamide orally (PO) on days 1-57 and mifepristone PO on days 29-57. Treatment continues in the absence of disease progression or unacceptable toxicity. PHASE II: Patients receive enzalutamide PO for 12 weeks per standard of care. Patients are then randomized to 1 of 2 treatment arms. ARM I: Patients receive enzalutamide PO per standard of care. ARM II: Patients receive enzalutamide PO and mifepristone PO. In both arms, treatment continues in the absence of disease progression or unacceptable toxicity. After completion of study treatment, patients are followed up for 1 year.
Investigators
Eligibility Criteria
Inclusion Criteria
- •Histologically or cytologically confirmed prostate cancer
- •Evidence of castrate testosterone level \< 50 ng/dL (or surgical castration)
- •For Phase I portion of the study: evidence of disease progression:
- •2 or more new lesions on bone scan or
- •Progressive disease on computed tomography (CT)/magnetic resonance imaging (MRI) according to Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 criteria or
- •Rising PSA: PSA evidence for progressive prostate cancer consists of a minimum PSA level of at least 2 ng/ml, which has subsequently risen on at least 2 successive occasions, at least 2 weeks apart
- •For Phase II portion of the study:
- •Subjects must be on enzalutamide for metastatic CRPC and within the first 12 weeks of enzalutamide at 160mg/day
- •Record of subject's enzalutamide start date and baseline PSA (within 28 days of starting) before starting enzalutamide available
- •Subjects must have documented clinically stable disease or better during the screening period of the study as defined by all of the following:
Exclusion Criteria
- •Therapy with other hormonal therapy, including any dose of megestrol acetate (Megace), finasteride (Proscar), dutasteride (Avodart), or any herbal product known to decrease PSA levels (e.g., saw palmetto and PC-SPES), or any systemic corticosteroid within 2 weeks prior to first dose of study drug
- •Inability to swallow capsules or known gastrointestinal malabsorption
- •History of other malignancies, with the exception of: adequately treated non-melanoma skin cancer, adequately treated superficial bladder cancer, stage 1 or 2 solid tumor malignancies who are without evidence of disease, or other solid tumors curatively treated with no evidence of disease for \>= 5 years from enrollment
- •Blood pressure that is not controlled despite \> 2 oral agents (systolic blood pressure \[SBP\] \> 160 and diastolic blood pressure \[DBP\] \> 90 documented during the screening period with no subsequent blood pressure readings \< 160/100)
- •History of seizure disorder or active use of anticonvulsants
- •Corrected QT interval (QTc) on electrocardiogram (EKG) \> 450 msec
- •Serious intercurrent infections or non-malignant medical illnesses that are uncontrolled
- •Active psychiatric illness/social situations that would limit compliance with protocol requirements
- •New York Heart Association (NYHA) class II, NYHA class III, or IV congestive heart failure (any symptomatic heart failure)
- •Concurrent therapy with strong inhibitors or inducers of cytochrome P450 family 3, subfamily A, polypeptide 4 (CYP3A4) or cytochrome P450 family 2, subfamily C, polypeptide 8 (CYP2C8) due to concerning possible drug-drug interactions
Arms & Interventions
Treatment (enzalutamide)
Patients receive enzalutamide PO per standard of care.
Intervention: enzalutamide
Treatment (enzalutamide)
Patients receive enzalutamide PO per standard of care.
Intervention: laboratory biomarker analysis
Treatment (enzalutamide)
Patients receive enzalutamide PO per standard of care.
Intervention: pharmacological study
Treatment (enzalutamide, mifepristone)
Patients receive enzalutamide PO and mifepristone PO.
Intervention: enzalutamide
Treatment (enzalutamide, mifepristone)
Patients receive enzalutamide PO and mifepristone PO.
Intervention: mifepristone
Treatment (enzalutamide, mifepristone)
Patients receive enzalutamide PO and mifepristone PO.
Intervention: laboratory biomarker analysis
Treatment (enzalutamide, mifepristone)
Patients receive enzalutamide PO and mifepristone PO.
Intervention: pharmacological study
Outcomes
Primary Outcomes
PSA Progression-free Survival
Time Frame: Up to 3 years, measured from randomization
PSA progression was defined as a PSA that is ≥1.25 times (25% increase) the PSA at randomization (week 12) and an absolute 5 ng/ml increase. PSA progression-free survival is PSA progression or death from any cause.
Secondary Outcomes
- Testosterone(12 to 16 weeks)
- Thyroid Stimulating Hormone(12 to 16 weeks)
- Cortisol(12 to 16 weeks)
- Number of Participants With Positive AR Expression Within Circulating Tumor Cells (CTCs)(Week 12 (randomization))
- Number of Participants With Positive GR Expression Within Circulating Tumor Cells (CTCs)(Week 12 (randomization))
- Radiographic PFS(Up to 3 years, measured from randomization)