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Selenium and Prostate Cancer: Clinical Trial on Availability to Prostate Tissue and Effects on Gene Expression

2014-08-27 03:39:39 | BioPortfolio

Summary

The aim of this study is to determine whether selenium supplementation leads to changes in selenium levels and gene expression profiles in prostate tissue.

Description

Rationale: Prostate cancer is a frequently observed malignancy in men, especially in elderly men. Besides diagnosis and treatment, also prevention of prostate cancer is an important point of interest to reduce the incidence and mortality of prostate cancer. Selenium is considered to be a promising chemopreventive agent for prostate cancer. Exact mechanisms of chemoprevention by selenium are not fully understood. However, it is expected that selenium (among other effects) directly affects gene expression in the prostate.

Objective: The aim of this study is to get insight into bioavailability of selenium in prostate tissue and changes of gene expression profiles that might be responsible for selenium-induced chemoprevention. To meet this objective, the relationship between dietary selenium intake and changes in gene expression profiles, tissue selenium levels and blood flow in prostate tissue will be examined.

Study design: The present study is designed as a double-blind, randomized and placebo-controlled intervention trial. Blood samples, toenails, questionnaires, MR images and surgical specimens will be collected to examine effects of selenium supplementation.

Study population: The study population will consist of 60 men, diagnosed with prostate cancer and scheduled for radical prostatectomy. Written informed consent will be obtained from each participant.

Intervention: Participants will receive 300 ug selenium / day or a placebo during 5 weeks prior to radical prostatectomy. Selenium will be supplemented in the form of selenized yeast tablets (SelenoPrecise, Pharma Nord).

Main study parameters: Levels of selenium in prostate tissue and changes in prostate gene expression profiles of participants supplemented with selenium or placebo, compared before and after the short intervention period, will be considered as the main parameters of the present study. Besides gene expression profiles in prostate tissue, also gene expression profiles of peripheral mononuclear cells (PBMC), levels of selenium in blood and toenails and blood flow and permeability of blood vessels of prostate tissue will be analyzed.

Study Design

Allocation: Randomized, Endpoint Classification: Bio-availability Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Prevention

Conditions

Prostatic Neoplasms

Intervention

Selenium

Location

University Medical Centre St Radboud
Nijmegen
Gelderland
Netherlands
6500 HB

Status

Completed

Source

Wageningen University

Results (where available)

View Results

Links

Published on BioPortfolio: 2014-08-27T03:39:39-0400

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Medical and Biotech [MESH] Definitions

Tissue ablation of the PROSTATE performed by ultrasound from a transducer placed in the RECTUM. The procedure is used to treat prostate cancer (PROSTATIC NEOPLASMS) and benign prostatic hypertrophy (PROSTATIC HYPERPLASIA).

A selenium compound used as a source of SELENIUM, especially for patients that develop selenium deficiency following prolonged PARENTERAL NUTRITION.

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A group of proteins that covalently attach to selenium or SELENIUM-containing compounds.

Inorganic compounds formed through the oxidation of selenium.

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