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Clinical Trial Summary

RATIONALE: Soy protein supplement may prevent or delay the development of prostate cancer in patients who have elevated prostate-specific antigen (PSA) levels.

PURPOSE: Randomized phase II trial to determine the effectiveness of soy protein supplement in preventing prostate cancer in patients who have elevated PSA levels.


Clinical Trial Description

OBJECTIVES:

- Compare the reduction in the rate of prostatic cellular proliferation in patients with an elevated PSA (5 to 10 ng/mL) and a negative biopsy for prostate cancer when treated with daily soy protein supplements vs placebo.

- Compare the effect of these regimens on additional biomarkers of prostate cancer (PSA, high-grade prostate intraepithelial neoplasia, induction of apoptosis, sex steroid receptor expression, and loss of glutathione S-transferase-pi) in these patients.

- Compare the effect of these regimens on quality of life, including urinary and sexual function, in these patients.

OUTLINE: This is a randomized, double-blind, placebo-controlled, multicenter study. Patients are stratified according to race (Caucasian vs African American). After 2 weeks of daily oral placebo, patients are randomized to 1 of 2 arms.

- Arm I: Patients receive oral soy protein supplement daily for 12 months.

- Arm II: Patients receive oral placebo daily for 12 months. Quality of life is assessed at baseline and at 6 and 12 months.

PROJECTED ACCRUAL: A total of 160 patients (80 per arm) will be accrued for this study within 12 months. ;


Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver), Primary Purpose: Prevention


Related Conditions & MeSH terms


NCT number NCT00031746
Study type Interventional
Source Alliance for Clinical Trials in Oncology
Contact
Status Completed
Phase Phase 2
Start date February 2000
Completion date June 2006

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