Abiraterone/Prednisone for Metastatic Prostate Cancer
This study is looking at how well standard treatments for metastatic prostate cancer (cancer that has spread) work for men of different races and ethnicities. You would receive the standard medications, abiraterone acetate and prednisone, which are taken by mouth daily. Researchers want to see if there's a connection between your race/ethnicity and how well these treatments control your prostate-specific antigen (PSA) levels, a marker for prostate cancer. To join, you must be a man aged 18 or older with a confirmed diagnosis of metastatic prostate cancer. The study will follow your progress for up to 10 years.
- Study design
- This is a single-arm study, meaning all participants receive the same treatment. Approximately 130 men are expected to enroll.
- What's involved
- You would take abiraterone acetate and prednisone daily until your disease progresses. You will also continue androgen deprivation therapy (ADT) throughout the study.
- Compensation
- Not stated in the trial record.
- Follow-up
- Your PSA response will be measured from the start of treatment until 7 months after starting ADT. The study will follow participants for up to 10 years.
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NCT03833921
Evaluation of Response to Abiraterone/Prednisone by Race/Ethnicity and Other Factors in Metastatic Hormone Naive Prostate Cancer
Recruiting
PHASE2Ages 18+InterventionalTreatmentMartha MimsInvestigator-initiated
~130 participants
Updated 2025-12-11 on ClinicalTrials.gov
What's tested:Abiraterone AcetatePrednisone
At a glance
Recruiting sites
2 of 3 listed sites are recruiting right now
RecruitingSuspended, closed, or not yet open
What they're measuring
PSA Response Rate
Measured over Treatment start until 7 months after start of ADT
Conditions
Where it's being run
3 sites across 1 statesTexas3
Study leadership
- Martha Mims, MD, PhD · PRINCIPAL_INVESTIGATOR · Baylor College of Medicine
Who to contact
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Do you actually qualify for this trial?
Add a private profile and we'll compare every criterion below against your situation — and tell you which ones are met, uncertain, or excluding.
Eligibility criteria
Inclusion
All patients must have a histologically or cytologically proven diagnosis of adenocarcinoma of the prostate. All patients must have metastatic disease as evidenced by soft tissue and/or bony metastases prior to initiation of androgen deprivation therapy (ADT). NOTE: ADT does not include treatment with anti-androgens such as bicalutamide or flutamide or five alpha reductase inhibitors such as finasteride or dutasteride.
Patients must have radiographic assessments of all disease including bone scan (or PET scan) within 42 days prior to registration. All disease will be assessed and documented on the appropriate CRF.
Patients must have had no more than 42 days of prior castration (medical or surgical) for metastatic prostate cancer prior to starting abiraterone. The start date of medical castration is considered the day the patient first received an injection of a LHRH agonist/antagonist (or orchiectomy), not an oral antiandrogen. • If the method of castration was luteinizing hormone releasing hormone (LHRH) agonist or antagonist (i.e., leuprolide, goserelin or degarelix), the patient must be willing to continue the use of LHRH agonist/antagonist and add Abiraterone + Prednisone treatment. • If the patient was on an antiandrogen (e.g. bicalutamide, flutamide), the patient must be willing to switch over to Abiraterone + Prednisone treatment. There is no limit on how many days a patient may have been on an antiandrogen (e.g. bicalutamide, flutamide) or a five alpha reductase inhibitor (e.g. finasteride or dutasteride) prior to going on study and no washout is required.
Patients may have received prior ADT - neoadjuvant and/or adjuvant setting only - but it must not have lasted for more than 36 months. Single or combination therapy allowed. At least 6 months must have elapsed since completion of ADT in the neoadjuvant and/or adjuvant setting, and serum testosterone must be \> 50 ng/dL (non-castrate levels) within 28 days prior to registration. NOTE: Serum testosterone assessment is required for eligibility for only those patients with prior treatment with neoadjuvant or adjuvant ADT.
Patients who are deemed to have high-risk or extensive metastatic, hormone sensitive prostate cancer (mHSPC) per "clinical judgment" of the treating physician are eligible for enrollment if the participants are unsuitable candidates for docetaxel or if the participants have declined docetaxel therapy.
Patients may have received prior surgery. For all major surgeries, at least 14 days must have elapsed since completion and patient must have recovered from all major side effects of surgery per investigator's assessment.
Patients may have received or plan to receive concurrent bone targeting agents that do not have an effect on PSA (e.g. denosumab or bisphosphonate).
Patients must have no plans to receive any other experimental therapy while on the protocol treatment. Previous experimental therapy must have been completed at least 28 days prior to registration.
Patients must have a complete physical examination and medical history within 28 days prior to registration.
Patients must have a PSA ≥ 10 ng/mL obtained within 90 days prior to registration.
Patients must have a QTc interval \< 461 msec on the 12 lead ECG within 42 days prior to registration. Patients with asymptomatic or incidental bundle branch blocks may have QTc measured by a cardiologist or standard formulas such as Bazett's or Fridericia's to adjust for pre-existing blocks.
Patients must have adequate hepatic function, within 28 days prior to registration, as evidenced by: • bilirubin ≤ 2 x institutional upper limit of normal (ULN), and • SGOT (AST) and SGPT (ALT) ≤ 3 x institutional ULN, or ≤ 5 x institutional ULN if liver metastases are present.
Patients must have adequate renal function, within 28 days prior to registration, as evidenced by calculated creatinine clearance ≥ 40 mL/min using a serum creatinine or by 24-hour urine creatinine (using Cockroft-Gault equation).
Patients must have adequate hematologic function, within 28 days prior to registration as evidenced by:
leukocytes ≥ 3,000/mcL,
absolute neutrophil count (ANC) ≥ 1,500/mcL,
hemoglobin ≥ 9 g/dL, and
platelets ≥ 100,000/mcL.
Patients must have a Zubrod performance status of 0-2. Zubrod performance status 3 will be allowed if from bone pain only.
No other prior malignancy is allowed except for the following: adequately treated basal cell or squamous cell skin cancer, adequately treated Stage I or II cancer from which the patient is currently in complete remission, or any other cancer from which the patient has been disease-free for 5 years.
Patients must be ≥ 18 years of age.
Patients or their legally authorized representative must be informed of the investigational nature of this study and must sign and give written informed consent in accordance with institutional and federal guidelines.
Exclusion
Patients with known brain metastases are not eligible. Brain imaging studies are not required for eligibility if the patient has no neurologic signs or symptoms suggestive of brain metastasis. But, if brain imaging studies are performed, patients must be negative for disease.
Patients must not have received prior and/or must not have any plans for receiving concomitant therapy with ketoconazole, aminoglutethimide, or enzalutamide (MDV3100). Concurrent megestrol for hot flashes is allowed.
Patients must not have received any prior cytotoxic chemotherapy for metastatic prostate cancer. Prior cytotoxic chemotherapy with curative intent in the neoadjuvant or adjuvant setting is allowed. At least 2 years must have elapsed since completion of cytotoxic chemotherapy in the neoadjuvant and/or adjuvant setting.
Patients must not have New York Heart Association Class III or IV heart failure at the time of screening. Patients must not have any thromboembolic event, unstable angina pectoris, myocardial infarction, or serious uncontrolled cardiac arrhythmia within 6 months prior to registration. (Note: Androgen deprivation therapy may prolong the QT/QTc interval. Patients with congenital long AT syndrome, congestive heart failure, frequent electrolyte abnormalities, and patients taking drugs known to prolong the QT interval may be at increased risk.)
Patients with a known history of primary and secondary adrenal insufficiency are not eligible.
Patients must not be known to have hypersensitivity to abiraterone or to LHRH agonist/antagonist.
Patients must not have known gastrointestinal (GI) disease or GI procedure that could interfere with the GI absorption or tolerance of abiraterone, including difficulty swallowing oral medications per investigator's clinical judgement.
What this trial measures
- PSA Response RateTreatment start until 7 months after start of ADT
The proportion of subjects with PSA levels less than 4 ng/ml at the given time point.