Featured Research

from universities, journals, and other organizations

High Levels Of Sex Hormones Doubles Risk For Breast Cancer In Postmenopausal Women

Date:
April 17, 2002
Source:
Fox Chase Cancer Center
Summary:
Postmenopausal women with relatively high serum concentrations of estrogen and testosterone have about twice the risk of developing breast cancer as women with relatively low serum concentrations of these sex hormones. That is the result of an international study published in the April 17, 2002 issue of the Journal of the National Cancer Institute.

PHILADELPHIA (April 16, 2002) -- Postmenopausal women with relatively high serum concentrations of estrogen and testosterone have about twice the risk of developing breast cancer as women with relatively low serum concentrations of these sex hormones. That is the result of an international study published in the April 17, 2002 issue of the Journal of the National Cancer Institute (volume 93, number 8).

The finding was reported by the Endogenous Hormones and Breast Cancer Collaborative Group. Joanne F. Dorgan, M.P.H, Ph.D., a member of the Population Science Division at Fox Chase Cancer Center is a lead investigator of one of nine cohorts included in the analysis.

"The overall results show that postmenopausal women with higher serum sex hormone levels including estradiol and testosterone were twice as likely to develop breast cancer," explained Dorgan.

"Associations between serum sex hormone levels and risk of developing breast cancer were not different in women who donated blood closer in time to diagnosis, indicating higher hormone levels in these women were not a preclinical finding."

In each of the nine cohorts included in the analysis, women who donated blood were followed for an average of 2 to 12 years. During that time 663 women developed breast cancer. Hormones in their blood were compared with the hormones of 1,765 women who were the same age when blood was donated as the women who developed breast cancer.

“The results are highly statistically significant and were not altered when we adjusted for established risk factors for breast cancer,” added Dorgan. Some of the known risk factors for breast cancer are never having been pregnant, early menarche, and in postmenopausal women, late menopause, use of hormone replacement therapy, and being overweight."

“More analyses are planned to increase our understanding of what factors influence a woman's risk of breast cancer," Dorgan stated. "The ultimate goal is to identify ways to prevent breast cancer, which affects 193,700 women in the United States annually. ” The Endogenous Hormones and Breast Cancer Collaborative Group is international consortium that includes epidemiologists from the United States, England, Italy, and Japan. The group conducts research on the relationship of endogenous hormones to breast cancer development. Each of the nine cohorts in which the association of sex hormones with breast cancer has been prospectively evaluated is represented in this study. For the current analysis, researchers from each of the nine cohorts pooled their data so they could obtain more precise estimates of the risk of developing breast cancer associated with elevated estrogen and androgen levels. The larger sample size achieved by pooling the data also allows for analyses of subsets of interest.

The nine cohorts and the principal investigators who make up the Endogenous Hormones and Breast Cancer Collaborative Group include: the Columbia, MO. cohort (JF Dorgan), the Guernsey, UK cohort (TJ Key); Nurses' Health Study cohort (SE Hankinson), New York University Women's Health Study cohort (PG Toniolo), the ORDET, Italy cohort (F Berrino), the Rancho Bernardo cohort (E Barrett-Connor), the RERF, Japan cohort (M Kabuto), the SOF cohort (JA Cauley), and the Washington County, MD cohort (KJ Helzlsouer). Fox Chase Cancer Center, one of the nation’s first comprehensive cancer centers designated by the National Cancer Institute in 1974, conducts basic and clinical research; programs of prevention, detection and treatment of cancer; and community outreach. For more information about Fox Chase activities, visit the Center’s web site at http://www.fccc.edu or call 1-888-FOX CHASE.


Story Source:

The above story is based on materials provided by Fox Chase Cancer Center. Note: Materials may be edited for content and length.


Cite This Page:

Fox Chase Cancer Center. "High Levels Of Sex Hormones Doubles Risk For Breast Cancer In Postmenopausal Women." ScienceDaily. ScienceDaily, 17 April 2002. <www.sciencedaily.com/releases/2002/04/020417070120.htm>.
Fox Chase Cancer Center. (2002, April 17). High Levels Of Sex Hormones Doubles Risk For Breast Cancer In Postmenopausal Women. ScienceDaily. Retrieved August 22, 2014 from www.sciencedaily.com/releases/2002/04/020417070120.htm
Fox Chase Cancer Center. "High Levels Of Sex Hormones Doubles Risk For Breast Cancer In Postmenopausal Women." ScienceDaily. www.sciencedaily.com/releases/2002/04/020417070120.htm (accessed August 22, 2014).

Share This




More Health & Medicine News

Friday, August 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Drug Used To Treat 'Ebola's Cousin' Shows Promise

Drug Used To Treat 'Ebola's Cousin' Shows Promise

Newsy (Aug. 21, 2014) An experimental drug used to treat Marburg virus in rhesus monkeys could give new insight into a similar treatment for Ebola. Video provided by Newsy
Powered by NewsLook.com
Two US Ebola Patients Leave Hospital Free of the Disease

Two US Ebola Patients Leave Hospital Free of the Disease

AFP (Aug. 21, 2014) Two American missionaries who were sickened with Ebola while working in Liberia and were treated with an experimental drug are doing better and have left the hospital, doctors say on August 21, 2014. Duration: 01:05 Video provided by AFP
Powered by NewsLook.com
Cadavers, a Teen, and a Medical School Dream

Cadavers, a Teen, and a Medical School Dream

AP (Aug. 21, 2014) Contains graphic content. He's only 17. But Johntrell Bowles has wanted to be a doctor from a young age, despite the odds against him. He was recently the youngest participant in a cadaver program at the Indiana University NW medical school. (Aug. 21) Video provided by AP
Powered by NewsLook.com
American Ebola Patients Released: What Cured Them?

American Ebola Patients Released: What Cured Them?

Newsy (Aug. 21, 2014) It's unclear whether the American Ebola patients' recoveries can be attributed to an experimental drug or early detection and good medical care. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins