- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00078923
Soy Isoflavones in Treating Patients Who Are Undergoing Radical Prostatectomy for Stage I or Stage II Adenocarcinoma of the Prostate
Phase II Clinical Trial of Soy Isoflavones Prior to Radical Prostatectomy
RATIONALE: Chemoprevention therapy is the use of certain drugs to try to prevent or delay the development of early cancer. Soy isoflavones may be effective in delaying the development of early prostate cancer.
PURPOSE: This randomized phase II trial is studying different regimens of soy isoflavones to compare how well they work in treating patients who are undergoing radical prostatectomy for stage I or stage II prostate cancer (adenocarcinoma).
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
OBJECTIVES:
- Compare blood/prostate biomarkers of oxidative stress and prostate cancer risk in patients with stage I or II adenocarcinoma of the prostate treated with 3 different dose levels of soy isoflavones before radical prostatectomy.
- Compare prostatic tissue biomarkers of proliferation and apoptosis in patients treated with these regimens.
- Determine the potential response, in terms of tumor and prostatic intraepithelial neoplasia grade and volume, extraprostatic extension, and serum prostate-specific antigen level, in patients treated with soy isoflavones and in those treated with placebo.
- Determine the safety of soy isoflavone supplementation in these patients.
OUTLINE: This is a randomized, double-blind, placebo-controlled, parallel-group study. Patients are stratified according to tumor stage (T1c vs T2). Patients are randomized to 1 of 4 treatment arms.
- Arm I (control group): Patients receive oral placebo once daily.
- Arm II: Patients receive oral soy isoflavones and oral placebo once daily.
- Arm III: Patients receive a higher dose of oral soy isoflavones and oral placebo once daily.
- Arm IV: Patients receive a higher dose (higher than arm III) of oral soy isoflavones once daily.
In all arms, treatment continues for 2-6 weeks (depending on the time from study entry to planned surgery) in the absence of unacceptable toxicity. All patients then undergo radical prostatectomy.
Patients are followed at 1 week.
PROJECTED ACCRUAL: A total of 100 patients (25 per treatment arm) will be accrued for this study within 12.5 months.
Study Type
Enrollment (Actual)
Phase
- Phase 2
Contacts and Locations
Study Locations
-
-
Michigan
-
Detroit, Michigan, United States, 48201-1379
- Barbara Ann Karmanos Cancer Institute
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
DISEASE CHARACTERISTICS:
Histologically confirmed adenocarcinoma of the prostate
- Stage T1c or T2
- Disease confined to the prostate gland
- Planning to undergo radical prostatectomy within the next 3-4 weeks
PATIENT CHARACTERISTICS:
Age
- 18 and over
Performance status
- Not specified
Life expectancy
- Not specified
Hematopoietic
- Not specified
Hepatic
- ALT and AST less than 2 times upper limit of normal (ULN)
- Alkaline phosphatase less than 2 times ULN
Renal
- Not specified
Other
- Fertile patients must use effective barrier contraception
- Medically cleared for surgery
- No concurrent thyroid disease
PRIOR CONCURRENT THERAPY:
Biologic therapy
- No prior biological therapy for prostate cancer
- No concurrent biological agents
Chemotherapy
- No prior chemotherapy for prostate cancer
- No concurrent chemotherapy
Endocrine therapy
- No prior hormonal therapy for prostate cancer
- No concurrent thyroid hormone replacement medication
- No concurrent hormonal therapy
Radiotherapy
- Not specified
Surgery
- See Disease Characteristics
Other
- At least 3 months since prior high-dose nutritional supplements
- No concurrent regular use (more than once weekly) of soy products greater than 50 g of soy protein or 50 mg of soy isoflavone
No concurrent high-dose nutritional supplements
- Standard-dose single multivitamin tablet (e.g., Centrum™) allowed
- No concurrent herbs
- No concurrent soy foods
- No other concurrent isoflavone supplements
- No other concurrent antineoplastic agents
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Prevention
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Placebo
Arm I (control group): Patients receive 4 placebo capsules by mouth daily for three weeks.
|
Prostatectomy or Brachytherapy
Arm I: 4 placebo capsules Arm II: 3 placebo capsules Arm III: 2 placebo capsules
|
Experimental: Soy isoflavones and placebo
Arm II: Patients receive oral soy isoflavones (PTI G-2535) 150 mg genistein capsules + 3 placebo capsules by mouth daily for 3 weeks.
|
Prostatectomy or Brachytherapy
Arm I: 4 placebo capsules Arm II: 3 placebo capsules Arm III: 2 placebo capsules
|
Experimental: Soy Isoflavones/Placebo
Arm III: Patients receive oral soy isoflavones (PTI G-2535) 300 mg genistein capsules + 2 placebo capsules by mouth daily for 3 weeks.
|
Prostatectomy or Brachytherapy
Arm I: 4 placebo capsules Arm II: 3 placebo capsules Arm III: 2 placebo capsules
|
Experimental: Soy Isoflavones
Arm IV: Arm III: Patients receive oral soy isoflavones (PTI G-2535) 600 mg genistein capsules by mouth daily for 3 weeks.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
Oxidative DNA damage as measured by 5-hydroxymethyluridine level
Time Frame: at 3 weeks
|
at 3 weeks
|
Lipid oxidation as measured by 8-isoprostane level
Time Frame: at 3 weeks
|
at 3 weeks
|
Secondary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
Tumor size, grade, and extension
Time Frame: at 3 weeks
|
at 3 weeks
|
Prostate-specific antigen and prostatic intraepithelial neoplasia grade
Time Frame: at 3 weeks
|
at 3 weeks
|
Biomarkers of cell growth, differentiation, and apoptosis
Time Frame: at 3 weeks
|
at 3 weeks
|
Toxicity as measured by number and grade of adverse events
Time Frame: at 3 weeks
|
at 3 weeks
|
Collaborators and Investigators
Collaborators
Investigators
- Principal Investigator: Omer Kucuk, MD, Barbara Ann Karmanos Cancer Institute
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- CDR0000353197
- P30CA022453 (U.S. NIH Grant/Contract)
- WSU-C-2418
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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