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An Efficacy and Safety Study of Abiraterone Acetate and Prednisone in Participants With Prostate Cancer Who Failed Androgen Deprivation and Docetaxel-Based Chemotherapy

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ClinicalTrials.gov Identifier: NCT00485303
Recruitment Status : Completed
First Posted : June 12, 2007
Results First Posted : June 17, 2013
Last Update Posted : July 2, 2013
Sponsor:
Information provided by (Responsible Party):
Cougar Biotechnology, Inc.

Study Description
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Brief Summary:
The purpose of this study is to evaluate the efficacy and safety of abiraterone acetate in participants with advanced prostate cancer (a disease in which cells in the prostate gland become abnormal and start to grow uncontrollably, forming tumors).

Condition or disease Intervention/treatment Phase
Prostatic Neoplasms Prostate Cancer Drug: Abiraterone acetate Drug: Prednisone Phase 2

Detailed Description:
This is an open-label (all people know the identity of the intervention), single-arm, multicenter (when more than one hospital or medical school team work on a medical research study) study to evaluate the anti-tumor activities and safety of abiraterone acetate in participants with prostate cancer who have failed androgen deprivation and docetaxel-based chemotherapy. Abiraterone acetate oral tablet will be administered as a total dose of 1000 milligram (mg) orally (by mouth) once daily after an overnight fast and prednisone/prednisolone will be administered as 5 mg oral tablet twice daily. Participants will be enrolled and treated up to 12 cycles (or longer, if they have not progressed and continue to benefit from treatment). The study will consist of 3 parts: Screening (14 days), Open-label Treatment; and follow-up (up to 60 months). Participants will be evaluated primarily for prostate specific antigen response according to Prostate Specific Antigen Working Group (PSAWG) criteria. Participants' safety will be monitored throughout the study.
Study Design
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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 58 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: A Phase II Open Label Study of CB7630 (Abiraterone Acetate) and Prednisone in Patients With Advanced Prostate Cancer Who Have Failed Androgen Deprivation and Docetaxel-Based Chemotherapy
Study Start Date : June 2007
Actual Primary Completion Date : October 2011
Actual Study Completion Date : October 2011

Resource links provided by the National Library of Medicine


Arms and Interventions
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Arm Intervention/treatment
Experimental: Abiraterone
Abiraterone acetate 1000 milligram (mg) (4 oral tablets of 250 mg each) will be administered once daily along with 5 mg oral prednisolone tablet administered twice daily for 28-days dosing cycle and will be continued until disease progression or unacceptable toxicity.
 Drug: Abiraterone acetate
Abiraterone acetate oral tablets 250 milligram (mg) each will be administered at a total dose of 1000 mg until documented disease progression or unacceptable toxicity.

Drug: Prednisone
Prednisone/Prednisolone 5 mg tablet will be taken orally twice daily.
Other Name: CB7630


Outcome Measures
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Primary Outcome Measures :
  1. Percentage of Participants With Prostate Specific Antigen (PSA) Response [ Time Frame: Day 1 of each cycle (of 28 days each) up to Cycle 12 ]
    The PSA response was evaluated according to Prostate-Specific Antigen Working Group (PSAWG) criterion, which is, greater than or equal to 50 percent decrease in PSA from Baseline during the study, which would be subsequently confirmed by a measurement that is at least 4 or more weeks after initial documentation of PSA response.


Secondary Outcome Measures :
  1. Prostate-Specific Antigen Based Progression-free Survival (PSA-PFS) [ Time Frame: Baseline and Day 1 of each cycle until first documented disease progression or up to 60 months ]
    The PSA-PFS is defined as time to first PSA failure (that is, two consecutive increases in PSA of 50 percent and greater than or equal to 5 nanogram per milliliter, as per Prostate-Specific Antigen Working Group [PSAWG] criterion) or death or the start of secondary anti-tumor therapy, whichever occurs first. If a PSA progression or death does not occur, subject will be censored at the last PSA evaluation.

  2. Radiographic Progression Free Survival (PFS) [ Time Frame: Baseline, Day 1 of Cycle 4, 7 and 10, and thereafter every third cycle until first documented disease progression or up to 60 months ]
    The RAD-PFS is defined as the time from randomization to the earliest objective evidence of radiographic progression or death due to any cause. Progression is defined using Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.0, as at least a 20% increase in the sum of the longest diameter of target lesions, taking as reference the smallest sum longest diameter recorded since the treatment started or the appearance of one or more new lesions.

  3. Overall Survival (OS) [ Time Frame: Every 3 months until death or up to 60 months ]
    Overall survival is defined as the interval from the date of the first dose of abiraterone acetate to the date of death.

  4. Percentage of Participants With Objective Radiographic Response [ Time Frame: Baseline, Day 1 of Cycle 4, 7 and 10, and thereafter every third cycle until first documented disease progression or up to 60 months ]
    Percentage of participants with radiographic objective response is defined as the percentage of participants with complete response (CR) or partial response (PR) as best overall response based on reconciled radiographic disease assessment according to RECIST Version 1.0. The CR is disappearance of all lesions. The PR is at least 30 percent decrease in sum of the longest diameter of target lesions or persistence of one or more non-target lesion(s) or/and maintenance of tumor marker level above the normal limits.

  5. Time to PSA Progression [ Time Frame: Day 8 of Cycle 1, thereafter Day 1 of each cycle up to end of study (60 months) ]
    The time interval from first dose of abiraterone acetate to the date of PSA progression as defined by the Prostate-Specific Antigen Working Group (PSAWG) criteria. If a PSA progression does not occur, subject will be censored at the last PSA evaluation.

  6. Time to Radiographic Progression [ Time Frame: Baseline, Day 1 of Cycle 4, 7 and 10, and thereafter every third cycle until first documented disease progression or up to 60 months ]
    Time to radiographic progression is defined as the time from first dose until the first radiographic progression date that was confirmed.

  7. Shift From Baseline in Number of Participants With Eastern Cooperative Oncology Group (ECOG) Performance Status Score [ Time Frame: Baseline and Day 1 of each cycle until first documented disease progression or up to 60 months ]
    ECOG performance status score ranges from 0 to 5 where 0=fully active, perform all pre-disease activities without restriction. 1=restricted in physically strenuous activity but ambulatory, carry out work of a light or sedentary nature, 2=ambulatory, capable of self-care, unable to carry out any work activities, up and about more than (>) 50 percent of waking hours, 3=capable of limited self-care, confined to bed or chair >50 percent of waking hours, 4=completely disabled, not capable of any self-care, totally confined to bed or chair and 5=dead.

  8. Percentage of Participants With Clinical Benefit [ Time Frame: Baseline, Day 1 of Cycle 4, 7 and 10, and thereafter every third cycle until first documented disease progression or up to 60 months ]
    Clinical benefit was defined as an observation of at least 1 of the following: PSA response by PSAWG criteria; radiographic response by RECIST criteria; stable disease by RECIST criteria lasting 6 months; or improvement by at least 1 unit in ECOG performance status.


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

Inclusion Criteria:

  • Histologically or cytologically confirmed adenocarcinoma (malignant epithelial tumor with a glandular organization)of the prostate (a gland in the male reproductive system found below the bladder and in front of the rectum), but not with neuroendocrine (specialized neurons that produce hormones, such as neuropeptides or biogenic amines) differentiation or of small cell histology
  • Prior chemotherapy (treatment of disease, usually cancer, by chemical agents) for prostate cancer with regimen(s) containing docetaxel
  • Documented prostate specific antigen (PSA) progression according to Prostate Specific Antigen Working Group (PSAWG) eligibility criteria with a PSA more than (>) 5 nanogram per milliliter (ng/mL) or objective progression by Response Evaluation Criteria in Solid Tumors (RESIST) criteria
  • Ongoing androgen deprivation with serum testosterone less than (<) 50 nanogram per deciliter (ng/dL)
  • Eastern Cooperative Oncology Group (ECOG) Performance Status of less than equal to (<=) 2 (Karnofsky Performance Status >= 50 percent)

Exclusion Criteria:

  • Active or uncontrolled autoimmune disease (disorder in which a person's immune system attacks parts of his or her own body) that may require corticosteroid therapy
  • Serious or uncontrolled co-existent non-malignant disease, including active and uncontrolled infection
  • Uncontrolled hypertension (high blood pressure)
  • Hemoglobin <=9.0 gram per deciliter (g/dL) without growth factor or transfusion support
  • Abnormal liver (large organ that helps in many body functions, including digestion, metabolism, and storage of substances) function
Contacts and Locations
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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): NCT00485303


Locations
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United States, California
UCLA
Los Angeles, California, United States, 90024
Los Angeles, California, United States
UCSF Comprehensive Cancer Center
San Francisco, California, United States, 94115
San Francisco, California, United States
United States, Maryland
John Hopkins
Baltimore, Maryland, United States, 21205
Baltimore, Maryland, United States
United States, Massachusetts
Masachussetts General Hospital Cancer Center
Boston, Massachusetts, United States, 02114
Dana-Farber Cancer Institute
Boston, Massachusetts, United States, 02115
Beth Israel Hospital
Boston, Massachusetts, United States, 02215
Boston, Massachusetts, United States
United States, New York
Memorial Sloan-Kettering Cancer Center
New York, New York, United States, 10021
New York, New York, United States
United Kingdom
Royal Marsden Hospital
Sutton, United Kingdom
Sutton, United Kingdom
Sponsors and Collaborators
Cougar Biotechnology, Inc.
Investigators
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Study Director: Cougar Biotechnology, Inc. Clinical Trial Cougar Biotechnology, Inc.
More Information
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Additional Information:

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):

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Responsible Party: Cougar Biotechnology, Inc.
ClinicalTrials.gov Identifier: NCT00485303    
Other Study ID Numbers: CR016921
COU-AA-004
2007-002725-74 ( EudraCT Number )
First Posted: June 12, 2007    Key Record Dates
Results First Posted: June 17, 2013
Last Update Posted: July 2, 2013
Last Verified: June 2013
Keywords provided by Cougar Biotechnology, Inc.:
Prostatic Neoplasms
Prostate cancer
Abiraterone acetate
CB7630
Prednisone
Additional relevant MeSH terms:
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Prostatic Neoplasms
Genital Neoplasms, Male
Urogenital Neoplasms
Neoplasms by Site
Neoplasms
Prostatic Diseases
Prednisone
Abiraterone Acetate
Anti-Inflammatory Agents
Glucocorticoids
 Hormones
Hormones, Hormone Substitutes, and Hormone Antagonists
Physiological Effects of Drugs
Antineoplastic Agents, Hormonal
Antineoplastic Agents
Steroid Synthesis Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Hormone Antagonists
Cytochrome P-450 Enzyme Inhibitors