Featured Research

from universities, journals, and other organizations

Soy isoflavones not a risk for breast cancer survivors, study finds

Date:
April 5, 2011
Source:
American Association for Cancer Research
Summary:
Soy food consumption did not increase the risk of cancer recurrence or death among survivors of breast cancer, according to the results of a new study.

Soy food consumption did not increase the risk of cancer recurrence or death among survivors of breast cancer, according to the results of a study presented at the AACR 102nd Annual Meeting 2011, held April 2-6.

Related Articles


Researchers investigated the association between soy food intake and breast cancer outcomes among survivors, using data from a multi-institution collaborative study, the After Breast Cancer Pooling Project.

"There has been widespread concern about the safety of soy food for women with breast cancer," said lead researcher Xiao Ou Shu, M.D., Ph.D., professor of medicine at Vanderbilt Epidemiology Center, Vanderbilt University Medical Center. "Soy foods contain large amounts of isoflavones that are known to bind to estrogen receptors and have both estrogen-like and anti-estrogenic effects. There are concerns that isoflavones may increase the risk of cancer recurrence among breast cancer patients because they have low estrogen levels due to cancer treatment. We're particularly concerned that isoflavones may compromise the effect of tamoxifen on breast cancer treatment because both tamoxifen and isoflavones bind to estrogen receptors."

This research was funded by the American Recovery and Reinvestment Act of 2009, which combines the resources of four National Cancer Institute-funded studies: the Shanghai Breast Cancer Survival Study; the Life After Cancer Epidemiology Study; the Women's Healthy Eating and Living Study; and the Nurses' Health Study. Together these cohorts included 18,312 women between the ages of 20 and 83 years who had invasive primary breast cancer.

Soy isoflavones intake was assessed for 16,048 of these women on average of 13 months after breast cancer diagnosis using food frequency questionnaires for a group of soy isoflavones in three cohorts and on tofu and soy milk consumption in one cohort. Breast cancer outcomes were assessed, on average, nine years after cancer diagnosis.

Outcomes among the survivors who consumed the highest amounts of soy isoflavones (more than 23 mg per day) were compared with the outcomes of those whose intake was lowest (0.48 mg per day or lower). The average daily soy isoflavone intake among U.S. women was 3.2 mg; however, in the Shanghai group the amount was significantly higher at 45.9 mg.

Women in the highest intake category of more than 23 mg per day had a 9 percent reduced risk of mortality and a 15 percent reduced risk for recurrence, compared to those who had the lowest intake level. However, these results did not reach what the scientists call statistical significance, suggesting the finding could be chance.

"Our results indicate it may be beneficial for women to include soy food as part of a healthy diet, even if they have had breast cancer," said Shu. "This can't be directly generalized to soy supplements, however, as supplements may differ from soy foods in both the type and amount of isoflavones."

Further analysis of the data from this study, elucidating the interaction of soy isoflavones and tamoxifen, will be presented at the AACR Annual Meeting.


Story Source:

The above story is based on materials provided by American Association for Cancer Research. Note: Materials may be edited for content and length.


Cite This Page:

American Association for Cancer Research. "Soy isoflavones not a risk for breast cancer survivors, study finds." ScienceDaily. ScienceDaily, 5 April 2011. <www.sciencedaily.com/releases/2011/04/110405141703.htm>.
American Association for Cancer Research. (2011, April 5). Soy isoflavones not a risk for breast cancer survivors, study finds. ScienceDaily. Retrieved November 1, 2014 from www.sciencedaily.com/releases/2011/04/110405141703.htm
American Association for Cancer Research. "Soy isoflavones not a risk for breast cancer survivors, study finds." ScienceDaily. www.sciencedaily.com/releases/2011/04/110405141703.htm (accessed November 1, 2014).

Share This



More Health & Medicine News

Saturday, November 1, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Melafind: Spotting Melanoma Without a Biopsy

Melafind: Spotting Melanoma Without a Biopsy

Ivanhoe (Oct. 31, 2014) The MelaFind device is a pain-free way to check suspicious moles for melanoma, without the need for a biopsy. Video provided by Ivanhoe
Powered by NewsLook.com
Battling Multiple Myeloma

Battling Multiple Myeloma

Ivanhoe (Oct. 31, 2014) The answer isn’t always found in new drugs – repurposing an ‘old’ drug that could mean better multiple myeloma treatment, and hope. Video provided by Ivanhoe
Powered by NewsLook.com
Chronic Inflammation and Prostate Cancer

Chronic Inflammation and Prostate Cancer

Ivanhoe (Oct. 31, 2014) New information that is linking chronic inflammation in the prostate and prostate cancer, which may help doctors and patients prevent cancer in the future. Video provided by Ivanhoe
Powered by NewsLook.com
Sickle Cell: Stopping Kids’ Silent Strokes

Sickle Cell: Stopping Kids’ Silent Strokes

Ivanhoe (Oct. 31, 2014) Blood transfusions are proving crucial to young sickle cell patients by helping prevent strokes, even when there is no outward sign of brain injury. Video provided by Ivanhoe
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:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

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