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Ethnic Variations in Hormone Levels May Cause Differences in Breast Cancer Risk

Researchers have known that a woman’s natural hormone levels can affect her risk of developing breast cancer. A new study from the University of Southern California// (USC)// has found that the natural levels of estrogens in post-menopausal women varies by ethnicity and race, and may explain the differences in the groups’ breast cancer rates. The study appears in the October issue of Cancer Epidemiology, Biomarkers & Prevention.

Using data from the Multiethnic Cohort Study, V. Wendy Setiawan, Ph.D., assistant professor of preventive medicine at the Keck School of Medicine of USC, and her colleagues determined that of the five primary ethnicities/races in the cohort, native Hawaiians have the highest risk of breast cancer—65 percent greater than whites. They also had some of the highest levels of circulating estrogens.

“We had observed that some groups, such as native Hawaiians have higher breast cancer rates compared to white women. We knew hormones are a factor, so we decided to test them,” says Setiawan. “The research seems to support that idea.”

The researchers also found that Japanese-American women have comparatively high estrogen levels and the second highest breast cancer risk of the five groups. “This is interesting because breast cancer rates have been increasing steadily in Japanese women who live in the United States, as well as in women who live in Japan,” Setiawan says. “We think it could be caused by lifestyle changes that impact age at first menstruation or other factors.”

Latinas had similar hormone profiles to whites, while women who had recently immigrated had slightly lower levels, but which were not statistically significant, the researchers found. However, Latinas’ risk of breast cancer is the lowest of the groups studied.

One of the most interesting findings was that African-American women have a slightly lower post-menopausal breast cancer risk than whites, despite having comparativel
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