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Mushroom-supplemented soybean extract shows therapeutic promise for advanced prostate cancer
Date:2/20/2013

(SACRAMENTO, Calif.) A natural, nontoxic product called genistein-combined polysaccharide, or GCP, which is commercially available in health stores, could help lengthen the life expectancy of certain prostate cancer patients, UC Davis researchers have found.

Paramita GhoshMen with prostate cancer that has spread to other parts of the body, known as metastatic cancer, and who have had their testosterone lowered with drug therapy are most likely to benefit. The study, recently published in Endocrine-Related Cancer, was conducted in prostate cancer cells and in mice. Lowering of testosterone, also known as androgen-deprivation therapy, has long been the standard of care for patients with metastatic prostate cancer, but life expectancies vary widely for those who undergo this treatment. Testosterone is an androgen, the generic term for any compound that stimulates or controls development and maintenance of male characteristics by binding to androgen receptors.

The current findings hold promise for GCP therapy as a way to extend life expectancy of patients with low response to androgen-deprivation therapy. Paramita Ghosh, an associate professor in the UC Davis School of Medicine, led the pre-clinical study with a team that included UC Davis Comprehensive Cancer Center Director Ralph de Vere White, a UC Davis distinguished professor of urology. Ruth Vinall in the UC Davis Department of Urology and Clifford Tepper in the UC Davis Department of Biochemistry and Molecular Medicine directed the studies in mice; Ghosh's laboratory conducted the cell studies.

The research focused on GCP, a proprietary extract cultured from soybeans and shiitake mushrooms and marketed by Amino-Up of Sapporo, Japan. Researchers found that the combination of the compounds genistein and daidzein, both present in GCP, helps block a key mechanism used by prostate cancer cells to survive in the face of testosterone deprivation.

The research team had earlier shown that w
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Contact: Dorsey Griffith
dorsey.griffith@ucdmc.ucdavis.edu
916-734-9118
University of California - Davis Health System
Source:Eurekalert

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