New drug combo targets Hard-to-Treat prostate cancer
NCT ID NCT02522715
First seen Jun 27, 2026 · Last updated Sep 16, 2026 · Updated 2 times
Summary
This study tests a combination of two drugs—cabazitaxel (a chemotherapy) and enzalutamide (a hormone blocker)—in people with prostate cancer that has spread and stopped responding to standard hormone therapy. The goal is to find the safest dose and see if the combination can lower PSA levels, a marker of cancer activity. About 37 participants are enrolled in this early-phase trial.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
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Phase 1/2
Runs two stages together: safety and dose first, then whether the treatment works.
- Participants
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37 people
The number who actually took part.
- Started
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Aug 2015
- Expected to finish
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Jan 2027
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 years and older
- Sex
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Male participants only
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * Metastatic CRPC * Willing to provide a tumor sample via biopsy from a metastatic site of disease to be collected at screening if safe and feasible per discretion of treating investigator; adequate archival metastatic tissue can be used, if available, in lieu of baseline biopsy if done when patient had CRPC; patients without a site amenable to biopsy and lack of archival tissue may still join the study * Evidence of prostate cancer progression by any of the following criteria: radiographic or PSA criteria, or symptomatic progression related to prostate cancer * Castrate testosterone levels (\< 50 ng/dL) achieved by orchiectomy or maintenance on a luteinizing hormone-releasing hormone (LHRH) agonist or antagonist * Histologic confirmation of original prostate cancer diagnosis per institutional standard; life expectancy of greater than 6 months * Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 * Leukocytes \>= 3,000/mm\^3 * Absolute neutrophil count \>= 1,500/mm\^3 * Platelets \>= 100,000/mm\^3 * Total bilirubin within normal institutional limits (or \< 2 X the upper limit of normal in those with Gilbert's disease) * Aspartate aminotransferase (AST) (serum glutamic oxaloacetic transaminase \[SGOT\])/alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase \[SGPT\]) =\< 1.5 X institutional upper limit of normal * Creatinine within less than the institutional upper limit of normal * Creatinine clearance \>= 45 mL/min/1.73 m\^2 for patients with creatinine levels above institutional normal * Subject agrees to use a double barrier method of birth control during the course of study treatment period with enzalutamide and/or cabazitaxel treatment and for at least 3 months after the study is discontinued * A double-barrier method of contraception involves the use of a condom in combination with 1 of the following: contraceptive sponge, diaphragm, or cervical ring with spermicidal gel or foam * Subject who has had a vasectomy at least 6 months prior to starting study treatment period and those whose female sexual partner(s) are more than 55 years of age and postmenopausal for at least 2 years or surgically sterile (tubal ligation, hysterectomy, or bilateral oophorectomy) agree to use at least a condom * Ability to understand, and the willingness to sign, a written informed consent document, as well as comply with study requirements * Must have appropriate wash out (\> 6 half-lives) of androgen receptor antagonists, 5 alpha reductase inhibitors or ketoconazole prior to the start of cycle 1; if the agent is not in the table below, the washout should be 2 weeks * Bicalutamide; approximate half-life: 6 days; washout period required: 36 days * Flutamide; approximate half-life: 6 hours; washout period required: 36 hours * Nilutamide approximate half-life: 4 days; washout period required: 24 days * Finasteride; approximate half-life: 8 hours; washout period required: 48 hours * Aminoglutethimide; approximate half-life: 15 hours; washout period required: 4 days * Ketoconazole; approximate half-life: 8 hours; washout period required: 48 hours Exclusion Criteria: * Prior chemotherapy for mCRPC prostate cancer; chemotherapy given neoadjuvantly, adjuvantly, or for hormone sensitive metastatic disease is permitted as long as the cancer did not progress on chemotherapy AND \> 6 months have elapsed * Patients may not have received any other investigational agents within the last 14 days at the time of treatment start * Patients may not have received enzalutamide or ARN-509 (another androgen receptor antagonist) in the past * Patients may not have received cabazitaxel in the past * Subject has clinical signs suggestive of high or imminent risks for pathological fracture, spinal cord compression and/or cauda equina syndrome * History of severe hypersensitivity reaction (\>= grade 3) to docetaxel, polysorbate 80 containing drugs, or any of the capsule components of enzalutamide, including Labrasol, butylated hydroxyanisole, and butylated hydroxytoluene * Concurrent or planned treatment with strong inhibitors or strong inducers of cytochrome P450 family 3, subfamily A, polypeptide 4/5 (3A4/5); (a one-week wash-out period is necessary for patients who are already on these treatments) * Uncontrolled, intercurrent illness including, but not limited to, ongoing or active infection, uncontrolled diabetes, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements * Subject has a history of seizure or any condition that may predispose to seizure including, but not limited to, underlying brain injury, stroke in the past 6 months, primary brain tumors, brain metastases, prior seizures * Subject has a history of unexplained loss of consciousness or transient ischemic attack within 12 months of treatment start * Subject is unwilling to stop using herbal supplements that can affect the PSA, such as saw palmetto or prostate cancer (PC)-SPES * Subject has another active malignancy other than non-melanomatous skin cancer (unless it is metastatic) or superficial bladder cancer * Must not have a gastrointestinal condition that would interfere with absorption * Subjects may not be on other therapies that affect hormone levels, such as estrogens, testosterones, ketoconazole during this study; however, megestrol for hot flashes is permitted
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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OHSU Knight Cancer Institute
Portland, Oregon, 97239, United States
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Portland VA Medical Center
Portland, Oregon, 97239, United States
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Seattle Cancer Care Alliance
Seattle, Washington, 98109, United States
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