Researchers have found that, in animal studies, a synthetic form of active vitamin D has a substantive preventive effect on the development of both estrogen receptor (ER)-positive and ER-negative breast cancers. Unlike many of the other synthetic vitamin D agents that have been tested in humans, this compound, known as Gemini 0097, shows no toxicity, they report. The research team found that daily injections of Gemini 0097 cut growth of ER-positive cancer by 60 percent in rat studies, and reduced ER-negative breast cancer by half in mice.
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