Alternate Title
Basic Trial Information
Objectives
Entry Criteria
Expected Enrollment
Outline
Trial Contact Information
Registry Information

Alternate Title

Vitamin E, Selenium, and Soy Protein in Preventing Cancer in Patients With High-Grade Prostate Neoplasia

Basic Trial Information

Phase	Type	Status	Age	Sponsor	Protocol IDs
Phase III	Prevention	Closed	Not specified	Other	CAN-NCIC-PRP1 NCT00064194, PRP1

Objectives

1. Determine whether nutritional supplementation with soy protein isolate, vitamin E, and selenium can delay the time to development of invasive prostate cancer (disease-free survival) in patients with high-grade prostatic intraepithelial neoplasia.
2. Determine the effect of this supplementation on intermediate endpoints that may reflect a lessened risk of invasive prostate cancer (e.g., serum PSA levels, hormone levels, lycopene, malondialdehyde, vitamin E, and reduced thiol groups) in these patients.
3. Determine the safety of this supplementation in these patients.

Entry Criteria

Disease Characteristics:

• Histologically confirmed high-grade prostatic intraepithelial neoplasia (HGPIN)
  • No evidence of invasive prostate cancer by at least 2 biopsies within the past 18 months
  • At least 1 biopsy must show evidence of HGPIN within the past 6 months



• No prior invasive prostate cancer

Prior/Concurrent Therapy:

Biologic therapy

• Not specified

Chemotherapy

• Not specified

Endocrine therapy

• More than 3 months since prior androgen therapy
• More than 3 months since prior hormonal therapy for benign prostatic hyperplasia (e.g., finasteride)
• No concurrent finasteride
• No concurrent androgen therapy

Radiotherapy

• More than 2 years since prior radiotherapy to the pelvic region

Surgery

• Not specified

Other

• More than 2 weeks since prior supplemental vitamin E or selenium
• No other concurrent vitamin E (greater than 100 IU/day), selenium, or soy protein isolate (more than 2 servings/week)
• No other concurrent treatment for high-grade prostatic intraepithelial neoplasia

Patient Characteristics:

Age

• Not specified

Performance status

• Not specified

Life expectancy

• More than 5 years

Hematopoietic

• Platelet count at least 75,000/mm³
• No coagulopathies

Hepatic

• Bilirubin no greater than 2 times upper limit of normal (ULN)
• PT (INR) no greater than 1.5 times ULN
• PTT no greater than 1.5 times ULN
• No hepatic insufficiencies

Renal

• Creatinine no greater than 2 times ULN
• No renal insufficiencies

Other

• No prior nonmelanoma skin cancer (e.g., squamous cell or basal cell carcinoma)
• No other malignancy within the past 5 years except superficial bladder cancer
• No known bowel malabsorption
• No dietary behavior (e.g., morbid obesity or eating disorders) that would limit adherence to study therapy
• No major illness, including psychiatric illness, that would preclude study compliance and follow-up

Expected Enrollment

A total of 306 patients (153 per treatment arm) will be accrued for this study within 6 years.

Outline

This is a randomized, double-blind, multicenter study. Patients are stratified according to participating center. Patients are randomized to 1 of 2 treatment arms.

• Arm I: Patients receive oral vitamin E, oral selenium, and oral soy protein isolate twice daily.



• Arm II: Patients receive oral placebo twice daily.

In both arms, treatment continues for 3 years in the absence of invasive prostate cancer (demonstrated on biopsy) or unacceptable toxicity.

Patients are followed every 3 months for 1 year and then every 6 months for 2 years.

Trial Contact Information

Trial Lead Organizations

NCIC-Clinical Trials Group

Neil Fleshner, Protocol chair		Ph: 416-946-2899

Registry Information
Official Title		A Double-Blind, Placebo-Controlled, Randomized Study Of Combination Vitamin E, Selenium And Soy Protein Product In Subjects With High Grade Prostatic Intraepithelial Neoplasia
Trial Start Date		2001-11-28
Registered in ClinicalTrials.gov		NCT00064194
Date Submitted to PDQ		2003-05-21
Information Last Verified		2004-09-21

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