Public Release:  Researchers report no difference in breast cancer characteristics after oophorectomy

Fox Chase Cancer Center

CHICAGO, IL. (May 28, 2010)--More than half a million women in the United States undergo a hysterectomy each year and approximately half of those surgeries include removal of the ovaries. Researchers know that removing a woman's ovaries is associated with a reduction in the risk of developing breast cancer, but it has not been clear whether those cancers that do arise in these women differ from breast cancers in the general population. Now, investigators at Fox Chase Cancer Center report that women who have had a bilateral oophorectomy tend to have smaller tumors and to have their tumors detected by mammography rather than by physical exam. The use of hormone therapy after surgery, however, wipes out any difference in tumor size or detection method.

The investigators, led by James R. Nitzkorski, M.D., a surgical oncology fellow at Fox Chase, will present their results at the 46th Annual Meeting of the American Society of Clinical Oncology on Saturday, June 5.

"It is helpful to know that tumors that develop after bilateral oophorectomy are not necessarily a more aggressive type of disease," Nitzkorski says. "There was no difference in overall survival or in prognostic factors, such as estrogen receptor status, progesterone receptor status, or HER2/neu status between women who had had an oophorectomy or not."

Removal of a woman's ovaries is associated with an 11% decrease in lifetime risk of breast cancer (the risk reduction associated with the surgery climbs to about 50% in women with a BRCA1/2 mutation). Given that reduction in risk, Nitzkorski and colleagues initially hypothesized that the tumors that do develop in women after a bilateral oophorectomy might be worse than the tumors that arise in the general population because they had to overcome the protective environment that exists in the absence of ovaries--that was not the case.

"I think women can be counseled that although they have developed breast cancer in the protective environment of an oophorectomy, we don't expect their cancer will be any better or worse than that of a woman who didn't have an oophorectomy," Nitzkorski says.

To evaluate the impact of ovary removal on breast cancers, the team identified 687 women diagnosed with invasive breast cancer between 2004 and 2008 at Fox Chase and who had a known ovary status. Of these, 71 (10.3%) had undergone a prior bilateral oophorectomy. The women who had had their ovaries removed were significantly more likely to have taken hormone replacement therapy than women who still had their ovaries, 56.3% versus 19.0%.

Tumors in the women who had undergone a bilateral oophorectomy were smaller than those in women who had their ovaries, with a median of 1.3 cm compared with 1.5 cm, which was a statistically significant difference. Additionally, mammographic detection was more common in women who had had their ovaries removed than in women with their ovaries, 69.0% compared with 47.9%, respectively. Although patient's cancer tumor and lymph node staging was accounted for, Nitzkorski and colleagues have not seen any difference in overall survival related to oophorectomy with in their 20 months of follow up

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Fox Chase Cancer Center is one of the leading cancer research and treatment centers in the United States. Founded in 1904 in Philadelphia as one of the nation's first cancer hospitals, Fox Chase was also among the first institutions to be designated a National Cancer Institute Comprehensive Cancer Center in 1974. Fox Chase researchers have won the highest awards in their fields, including two Nobel Prizes. Fox Chase physicians are also routinely recognized in national rankings, and the Center's nursing program has received the Magnet status for excellence three consecutive times. Today, Fox Chase conducts a broad array of nationally competitive basic, translational, and clinical research, with special programs in cancer prevention, detection, survivorship, and community outreach. For more information, visit Fox Chase's Web site at www.fccc.org or call 1-888-FOX CHASE or (1-888-369-2427).

Abstract #: 1596
Presentation Title: "Characteristics and behavior of invasive breast cancer developed despite prior oophorectomy"
Presentation Time: Saturday, June 5, at 8:00 a.m.

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