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Abiraterone Acetate in Castration-Resistant Prostate Cancer Previously Treated With Docetaxel-Based Chemotherapy

This study has been completed.
ClinicalTrials.gov Identifier:
First Posted: March 19, 2008
Last Update Posted: April 30, 2014
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by (Responsible Party):
Cougar Biotechnology, Inc.
This is a phase 3 study to compare the clinical benefit of abiraterone acetate plus prednisone with placebo plus prednisone in patients with metastatic castration-resistant prostate cancer (CRPC) who have failed one or two chemotherapy regimens. At least one of the previous chemotherapies must have contained docetaxel.

Condition Intervention Phase
Prostatic Neoplasms Drug: Placebo Drug: Abiraterone acetate Drug: Prednisone/prednisolone Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: A Phase 3, Randomized, Double-Blind, Placebo-Controlled Study of Abiraterone Acetate (CB7630) Plus Prednisone in Patients With Metastatic Castration-Resistant Prostate Cancer Who Have Failed Docetaxel-Based Chemotherapy

Resource links provided by NLM:

Further study details as provided by Cougar Biotechnology, Inc.:

Primary Outcome Measures:
  • Overall Survival [ Time Frame: Up to 60 months ]
    Overall survival is defined as the time interval from the date of randomization to the date of death from any cause.

Secondary Outcome Measures:
  • Time to Prostate-Specific Antigen Progression According to Prostate Specific Antigen Working Group Criteria [ Time Frame: Up to 12 months ]
    The time interval from the date of randomization to the date of the prostate-specific antigen (PSA) progression as defined in the protocol-specific Prostate Specific Antigen Working Group (PSAWG) criteria, namely, a PSA level of at least 5 ng/ml that has risen on at least 2 successive occasions, at least 2 weeks apart.

  • Number of Patients Achieving a Prostate-Specific Antigen Decline >=50% [ Time Frame: Up to 12 months ]
    A prostate-specific antigen (PSA) response was defined as a >=50% decline from baseline.

  • Radiographic Progression-free Survival [ Time Frame: Up to 11 months ]
    Radiographic progression-free survival is based on imaging studies according to modified Response Evaluation Criteria in Solid Tumors (RECIST): baseline lymph node size must be >=2.0 cm to be considered a target lesion; progression on bone scans with >=2 new lesions not consistent with tumor flare, confirmed on a second scan >=6 weeks later that shows >=1 additional new lesion.

Enrollment: 1195
Study Start Date: May 2008
Study Completion Date: October 2012
Primary Completion Date: August 2010 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Abiraterone acetate plus prednisone/prednisolone Drug: Abiraterone acetate
Four 250-mg tablets once daily until disease progression
Drug: Prednisone/prednisolone
5 mg twice daily until disease progression
Placebo Comparator: Placebo plus prednisone/prednisolone Drug: Placebo
Four tablets once daily until disease progression
Drug: Prednisone/prednisolone
5 mg twice daily until disease progression

Detailed Description:

Abiraterone acetate is a steroidal irreversible inhibitor of CYP17 (17α hydroxylase/C17, 20-lyase), blocking 2 important enzymatic activities in the synthesis of testosterone. The goal of this study is to compare the clinical benefit of abiraterone acetate plus prednisone with placebo plus prednisone in patients with metastatic castration-resistant prostate cancer (CRPC) who have failed one or two chemotherapy regimens, one of which contains docetaxel. All patients involved in the study will be randomized (assigned by chance) into one of two arms and will not know what study drug is being given to them. Study drug randomization allocation will be 2:1 (abiraterone acetate: placebo). The study will be conducted in the United States, Canada, Australia, and the EU. The study will consist of screening, treatment, and follow-up. In this study, patients will receive study treatment (abiraterone acetate or placebo) plus prednisone until progression of clinical disease. Follow-up will continue until patient dies, is lost to follow-up, or withdraws informed consent. After providing written informed consent, patients will have screening procedures completed to determine eligibility. Safety evaluations at the screening procedure will include a physical examination, vital signs, and clinical blood laboratory tests, ECG, radiographs, urine tests, and recording of any adverse events including details of current prostate cancer symptoms. Patients will be asked to use a method of birth control with adequate barrier protection as determined to be acceptable by the principal investigator and sponsor during the study and for 13 weeks after last study drug administration.

Study medication, abiraterone acetate,is an oral (by mouth) medication to be administered as four (4) 250mg abiraterone acetate tablets or 4 placebo tablets to be taken at least one hour before or two hours after a meal anytime up to 10PM everyday. Prednisone will be administered as 5mg orally twice a day for both groups. Each cycle will be 28 days. Study treatment will continue until disease progression as determined by investigator or when the patient meets criteria for withdrawal from study.


Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Metastatic Castration-Resistant Prostate Cancer Progression after one or two prior cytotoxic chemotherapies
  • At least one chemotherapy must have contained docetaxel
  • Eastern Cooperative Oncology Group (ECOG) Performance Status <= 2
  • Medical or surgical castration with testosterone < 50 ng/dL
  • Adequate bone marrow, hepatic and renal function
  • Potassium >= 3.5 mmol/L
  • Able to swallow the study drug whole as a tablet
  • Informed Consent

Exclusion Criteria:

  • More than two prior cytotoxic chemotherapy regimens
  • Prior Ketoconazole for prostate cancer
  • Prior abiraterone acetate or other CYP17 inhibitor or investigational agents targeting the androgen receptor for prostate cancer
  • Uncontrolled hypertension
  • Active or symptomatic viral hepatitis or chronic liver disease
  • History of pituitary or adrenal dysfunction
  • Clinically significant heart disease
  • Other malignancy
  • Known brain metastasis
  • GI disorder affecting absorption
  • Not willing to use contraception
  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00638690

  Show 128 Study Locations
Sponsors and Collaborators
Cougar Biotechnology, Inc.
Study Director: Cougar Biotechnology, Inc Clinical Trial Cougar Biotechnology, Inc.
  More Information

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Chi KN, Kheoh T, Ryan CJ, Molina A, Bellmunt J, Vogelzang NJ, Rathkopf DE, Fizazi K, Kantoff PW, Li J, Azad AA, Eigl BJ, Heng DY, Joshua AM, de Bono JS, Scher HI. A prognostic index model for predicting overall survival in patients with metastatic castration-resistant prostate cancer treated with abiraterone acetate after docetaxel. Ann Oncol. 2016 Mar;27(3):454-60. doi: 10.1093/annonc/mdv594. Epub 2015 Dec 18.
Fizazi K, Flaig TW, Stöckle M, Scher HI, de Bono JS, Rathkopf DE, Ryan CJ, Kheoh T, Li J, Todd MB, Griffin TW, Molina A, Ohlmann CH. Does Gleason score at initial diagnosis predict efficacy of abiraterone acetate therapy in patients with metastatic castration-resistant prostate cancer? An analysis of abiraterone acetate phase III trials. Ann Oncol. 2016 Apr;27(4):699-705. doi: 10.1093/annonc/mdv545. Epub 2015 Nov 25.
Antoun S, Bayar A, Ileana E, Laplanche A, Fizazi K, di Palma M, Escudier B, Albiges L, Massard C, Loriot Y. High subcutaneous adipose tissue predicts the prognosis in metastatic castration-resistant prostate cancer patients in post chemotherapy setting. Eur J Cancer. 2015 Nov;51(17):2570-7. doi: 10.1016/j.ejca.2015.07.042. Epub 2015 Aug 13.
Xu XS, Ryan CJ, Stuyckens K, Smith MR, Saad F, Griffin TW, Park YC, Yu MK, Vermeulen A, Poggesi I, Nandy P. Correlation between Prostate-Specific Antigen Kinetics and Overall Survival in Abiraterone Acetate-Treated Castration-Resistant Prostate Cancer Patients. Clin Cancer Res. 2015 Jul 15;21(14):3170-7. doi: 10.1158/1078-0432.CCR-14-1549. Epub 2015 Mar 31.
Scher HI, Heller G, Molina A, Attard G, Danila DC, Jia X, Peng W, Sandhu SK, Olmos D, Riisnaes R, McCormack R, Burzykowski T, Kheoh T, Fleisher M, Buyse M, de Bono JS. Circulating tumor cell biomarker panel as an individual-level surrogate for survival in metastatic castration-resistant prostate cancer. J Clin Oncol. 2015 Apr 20;33(12):1348-55. doi: 10.1200/JCO.2014.55.3487. Epub 2015 Mar 23.
Mulders PF, Molina A, Marberger M, Saad F, Higano CS, Chi KN, Li J, Kheoh T, Haqq CM, Fizazi K. Efficacy and safety of abiraterone acetate in an elderly patient subgroup (aged 75 and older) with metastatic castration-resistant prostate cancer after docetaxel-based chemotherapy. Eur Urol. 2014 May;65(5):875-83. doi: 10.1016/j.eururo.2013.09.005. Epub 2013 Sep 20.
Harland S, Staffurth J, Molina A, Hao Y, Gagnon DD, Sternberg CN, Cella D, Fizazi K, Logothetis CJ, Kheoh T, Haqq CM, de Bono JS, Scher HI; COU-AA-301 Investigators. Effect of abiraterone acetate treatment on the quality of life of patients with metastatic castration-resistant prostate cancer after failure of docetaxel chemotherapy. Eur J Cancer. 2013 Nov;49(17):3648-57. doi: 10.1016/j.ejca.2013.07.144. Epub 2013 Aug 22.
Ryan CJ, Molina A, Li J, Kheoh T, Small EJ, Haqq CM, Grant RP, de Bono JS, Scher HI. Serum androgens as prognostic biomarkers in castration-resistant prostate cancer: results from an analysis of a randomized phase III trial. J Clin Oncol. 2013 Aug 1;31(22):2791-8. doi: 10.1200/JCO.2012.45.4595. Epub 2013 Jul 1.
Logothetis CJ, Basch E, Molina A, Fizazi K, North SA, Chi KN, Jones RJ, Goodman OB, Mainwaring PN, Sternberg CN, Efstathiou E, Gagnon DD, Rothman M, Hao Y, Liu CS, Kheoh TS, Haqq CM, Scher HI, de Bono JS. Effect of abiraterone acetate and prednisone compared with placebo and prednisone on pain control and skeletal-related events in patients with metastatic castration-resistant prostate cancer: exploratory analysis of data from the COU-AA-301 randomised trial. Lancet Oncol. 2012 Dec;13(12):1210-7. doi: 10.1016/S1470-2045(12)70473-4. Epub 2012 Nov 9.
Fizazi K, Scher HI, Molina A, Logothetis CJ, Chi KN, Jones RJ, Staffurth JN, North S, Vogelzang NJ, Saad F, Mainwaring P, Harland S, Goodman OB Jr, Sternberg CN, Li JH, Kheoh T, Haqq CM, de Bono JS; COU-AA-301 Investigators. Abiraterone acetate for treatment of metastatic castration-resistant prostate cancer: final overall survival analysis of the COU-AA-301 randomised, double-blind, placebo-controlled phase 3 study. Lancet Oncol. 2012 Oct;13(10):983-92. doi: 10.1016/S1470-2045(12)70379-0. Epub 2012 Sep 18. Erratum in: Lancet Oncol. 2012 Nov;13(11):e464. Lancet Oncol. 2014 Aug;15(9):e365.
de Bono JS, Logothetis CJ, Molina A, Fizazi K, North S, Chu L, Chi KN, Jones RJ, Goodman OB Jr, Saad F, Staffurth JN, Mainwaring P, Harland S, Flaig TW, Hutson TE, Cheng T, Patterson H, Hainsworth JD, Ryan CJ, Sternberg CN, Ellard SL, Fléchon A, Saleh M, Scholz M, Efstathiou E, Zivi A, Bianchini D, Loriot Y, Chieffo N, Kheoh T, Haqq CM, Scher HI; COU-AA-301 Investigators. Abiraterone and increased survival in metastatic prostate cancer. N Engl J Med. 2011 May 26;364(21):1995-2005. doi: 10.1056/NEJMoa1014618.

Responsible Party: Cougar Biotechnology, Inc.
ClinicalTrials.gov Identifier: NCT00638690     History of Changes
Other Study ID Numbers: CR016924
COU-AA-301 ( Other Identifier: Cougar Biotechnology, Inc )
First Submitted: March 13, 2008
First Posted: March 19, 2008
Results First Submitted: August 23, 2011
Results First Posted: May 16, 2013
Last Update Posted: April 30, 2014
Last Verified: April 2014

Keywords provided by Cougar Biotechnology, Inc.:
Metastatic Castration-Resistant Prostate Cancer
Abiraterone Acetate

Additional relevant MeSH terms:
Prostatic Neoplasms
Genital Neoplasms, Male
Urogenital Neoplasms
Neoplasms by Site
Genital Diseases, Male
Prostatic Diseases
Methylprednisolone Hemisuccinate
Abiraterone Acetate
Prednisolone acetate
Methylprednisolone acetate
Prednisolone hemisuccinate
Prednisolone phosphate
Antineoplastic Agents
Tubulin Modulators
Antimitotic Agents
Mitosis Modulators
Molecular Mechanisms of Pharmacological Action
Anti-Inflammatory Agents
Hormones, Hormone Substitutes, and Hormone Antagonists
Physiological Effects of Drugs
Antineoplastic Agents, Hormonal
Autonomic Agents

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