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Molecule found that inhibits estrogen, key risk factor for endometrial and breast cancers

May 9, 2012 (Bronx, NY) Researchers at Albert Einstein College of Medicine of Yeshiva University have discovered a molecule that inhibits the action of estrogen. This female hormone plays a key role in the growth, maintenance and repair of reproductive tissues and fuels the development of endometrial and breast cancers. The molecule, discovered in animal studies, could lead to new therapies for preventing and treating estrogen-related diseases in humans. The findings were published online April 26 in the PNAS Plus.

The hormones estradiol (the most important form of estrogen) and progesterone prepare the uterus for pregnancy. They trigger a series of cell proliferation and cell differentiation events that prepare the uterine lining (endometrium) for implantation of a fertilized egg. Although this process is tightly controlled, uterine cells sometimes proliferate abnormally, leading to menstrual irregularities, endometrial polyps, endometriosis, or endometrial cancer ─ the most common female genital tract malignancy, causing six percent of cancer deaths among women in the U.S. and a higher proportion worldwide.

"The molecular mechanisms that underlie these pathologies are still obscure ─ and so are the mechanisms involved in normal hormonal regulation of cell proliferation in the endometrium, which is essential for successful pregnancy," said lead author Jeffrey Pollard, Ph.D., professor of developmental and molecular biology and of obstetrics & gynecology and women's health at Einstein. He also holds the Louis Goldstein Swan Chair in Women's Cancer Research and is the deputy director of the Albert Einstein Cancer Center.

In studies involving rodents, Dr. Pollard discovered that a molecule called KLF15 (Kruppel-like transcription factor-15) contro

Contact: Kim Newman
Albert Einstein College of Medicine

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