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Sponsored by: |
National Center for Complementary and Alternative Medicine (NCCAM) |
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Information provided by: | National Center for Complementary and Alternative Medicine (NCCAM) |
ClinicalTrials.gov Identifier: | NCT00200824 |
This study will determine the effects of soy products on in vitro surrogate cancer markers as well as bone density markers and quality of life parameters in men and women. This study will also determine concentrations of isoflavones (naturally occurring plant compounds that act like estrogen in the body) in prostate tissue that has been removed during prostatectomy, as well as in the blood.
Condition | Intervention | Phase |
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Breast Cancer Prostate Cancer |
Drug: Soy Isoflavone Nutritional Supplements |
Phase II |
Study Type: | Interventional |
Study Design: | Prevention, Randomized, Double-Blind, Placebo Control, Crossover Assignment, Safety/Efficacy Study |
Official Title: | Effects of Soy Isoflavones on the Prostate, Breast and Bone |
Study Start Date: | May 2000 |
Estimated Study Completion Date: | January 2005 |
In the United States, consumption of soy products has dramatically increased in the past several years. Foods made from soy are high in isoflavones and evidence suggests that these isoflavones, genistein in particular, have many beneficial properties such as alleviating menopausal side effects and reducing the risk of osteoporosis, breast cancer, and prostate cancer. However, this data has been derived largely from studies with animal or cell models; human trials are limited. This study will determine the effects of soy isoflavones on quality of life and cancer and bone density markers.
While isoflavones have been purported to inhibit the proliferation of cancer cells, the concentrations required for this anti-cancer effect were determined to be much higher than the concentrations that can be achieved in plasma after intake of isoflavones. Recent animal studies have suggested that isoflavones may be concentrated 10-fold in tissue compared to blood concentrations. If this is true, then the higher concentration would be in the range found in the cancer cell line research to be protective of cancer. This study will determine whether tissue concentrations are similar to, higher than, or different than blood concentrations.
This study will last 5 years and will comprise three populations: men with prostate cancer on androgen ablation therapy, postmenopausal women on hormone replacement therapy (HRT), and postmenopausal women not on HRT. Participants will be randomly assigned to receive either isoflavone or placebo for two to four weeks. Participants’ serum and serum extracts will be incubated with cultured human cell lines (prostate cancer, breast cancer and osteoblasts) and estrogenic and non-estrogenic mechanisms of action investigated. The human sera data will be complemented by parallel studies of direct addition of crystalline isoflavones (genistein, daidzein and equol) to the same cultured human cell lines. Participant’s serum and urine also will be tested for markers of bone resorption and formation. Quality of life issues will be assessed with questionnaires.
Genders Eligible for Study: | Both |
Accepts Healthy Volunteers: | Yes |
Inclusion Criteria
Exclusion Criteria
Study ID Numbers: | R01 AT000486 |
Study First Received: | September 13, 2005 |
Last Updated: | August 16, 2006 |
ClinicalTrials.gov Identifier: | NCT00200824 |
Health Authority: | United States: Federal Government |
isoflavones soy postmenopausal men |
prostate breast bone |
Prostatic Diseases Genital Neoplasms, Male Skin Diseases Breast Neoplasms |
Urogenital Neoplasms Genital Diseases, Male Prostatic Neoplasms Breast Diseases |
Neoplasms Neoplasms by Site |