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Estrogen replacement therapy speeds ovarian cancer growth, new study reports
Date:10/20/2010

hat did not receive ERT.

The team also found that the estrogen-regulated genes in ovarian cancer reacted differently than ER+ genes found in breast cancer, helping to explain why current anti-estrogen therapies used with breast cancer, such as Tamoxifen, are largely ineffective against ovarian cancer.

"Breast cancer and ovarian cancer are often linked when talking about hormone replacement therapy, but we found that only 10 percent of the ER+ genes overlapped," Spillman says. "We were able to identify estrogen-regulated genes specific to ER+ ovarian cancer that are not shared with ER+ breast cancers. We believe these genes can be specifically targeted with new anti-estrogen therapies that could more effectively treat ER+ ovarian cancers."

Spillman and her team now will begin to screen current antiestrogen therapies against the newly identified ovarian cancer genes to identify the pathways and compounds that are more likely to effectively treat ER+ ovarian cancer.

This study looked at the effect of estrogen replacement therapy in mice that already possessed ER+ ovarian cancer cells. It did not test whether the estrogen replacement actually could cause the development of these cancer cells. The study also dealt only with estrogen replacement, which is linked to higher risks of ovarian cancer, not combined estrogen/progesterone therapy that is used with women who retain their uteruses.

This research is too early to draw implications for use of estrogen replacement therapy in women, Spillman cautions. "We cannot make clinical recommendations based on what is happening in mice," says Spillman, one of just eight gynecological oncologists in Colorado. "Every woman is different and needs to talk to her doctor about the decision to use hormone replacement therapy."


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Contact: Lynn Clark
lynn.clark@ucdenver.edu
303-724-3160
University of Colorado Denver
Source:Eurekalert

Page: 1 2

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