Navigation Links
Soy May Reduce Breast Cancer Recurrence: Study
Date:10/18/2010

By Kathleen Doheny
HealthDay Reporter

MONDAY, Oct. 18 (HealthDay News) -- For women past menopause who have had breast cancer, a higher intake of soy may help reduce the risk of the disease's recurrence, a new study of Chinese women suggests.

The same link was not found in premenopausal women with breast cancer, whatever their soy intake, the study authors said.

The study, while called intriguing by U.S. experts, was not large and included only women with breast cancer receiving care in China. It's not known if the results would apply to other groups of women, said Marji McCullough, a spokeswoman for the American Cancer Society.

"Chinese women may have been likely to have a lifelong high consumption of soy," she said. "We don't know whether starting on a diet high in soy after a breast cancer diagnosis would have the same effect as eating a lifelong diet high in soy."

For the study, Dr. Qingyuan Zhang of the Cancer Hospital of Harbin Medical University in Harbin, China, evaluated 524 women who had undergone breast cancer surgery between August 2002 and July 2003. They were receiving endocrine therapy such as anastrozole (Arimidex) or tamoxifen to reduce cancer recurrence risk.

The researchers measured the women's dietary intake of soy isoflavones at the start of the study, and then followed them for about five years to see if breast cancer recurred.

For the premenopausal women, soy had no apparent effect on the risk of subsequent breast cancer.

But postmenopausal women with the highest intake of soy -- more than 42.3 milligrams of soy isoflavones a day -- had a 33 percent reduced risk of cancer recurrence. For patients receiving anastrozole and whose breast cancer was estrogen receptor-positive and progesterone receptor-positive, the risk reduction link was even stronger.

The study findings were published Oct. 18 in CMAJ (the Canadian Medical Association Journal).

A serving of soy milk has about 30 or 40 milligrams of isoflavones.

But Zhang cautioned that larger studies with women from many medical centers are needed before scientists can say that soy may help reduce the risk of breast cancer's return.

McCullough agreed. "It's still possible that other lifestyle differences in women in China who were eating less soy" might explain their higher likelihood of getting breast cancer again, she said.

There have been concerns about the effect of soy consumption on women with estrogen receptor-positive and progesterone receptor-positive breast cancer because soy isoflavones are similar to estrogen in chemical structure, and because tumor growth is dependent on estrogen, the study authors said in a news release.

Dr. Joanne Mortimer, director of the women's cancers programs at the City of Hope Comprehensive Cancer Center in Duarte, Calif., said some doctors tell women to avoid soy, concerned that too much might be hazardous. "I think this is yet another study that confirms that soy products do not cause an increased risk of breast cancer or even recurrence," she said.

But, it's not a reason to go overboard on soy, Mortimer said. "I wouldn't tell people they should eat a lot of soy," she said. Rather, "they should eat a healthy diet and if they eat soy, this study suggests there is not harm in it."

According to current American Cancer Society guidelines, which are under review, up to three servings a day of soy foods is considered safe, McCullough said. But women are advised to avoid the high soy dose found in more concentrated sources such as soy powders and isoflavone supplements, she said.

More information

To learn more about soy, visit the American Cancer Society.

SOURCES: Joanne Mortimer, M.D., director, women's cancers program, City of Hope Comprehensive Cancer Center, Duarte, Calif.; Marji McCullough Sc.D., R.D., strategic director, nutritional epidemiology, American Cancer Society, Atlanta; Oct. 18, 2010, CMAJ (Canadian Medical Association Journal)


'/>"/>
Copyright©2010 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. Vigorous exercise reduces breast cancer risk in African-American women
2. Adjunctive rufinamide reduces refractory partial-onset seizures
3. Dog ownership is associated with reduced eczema in children with dog allergies
4. After traumatic event, early intervention reduces odds of PTSD in children by 73 percent
5. Self-Touch May Reduce Pain, Study Finds
6. Nonstick coating of a protein found in semen reduces HIV infection
7. FDA Approves 1st Oral Drug to Reduce MS Relapses
8. Better marker for breast cancer may reduce need for second surgeries
9. Low-Dose Aspirin May Reduce Colon Cancer Risk
10. Successful periodontal therapy may reduce the risk of preterm birth, according to Penn dental study
11. Stopping smoking cessation treatments too soon may reduce odds of success for 45 percent of smokers
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Soy May Reduce Breast Cancer Recurrence: Study
(Date:2/13/2016)... Coral Springs, FL (PRWEB) , ... February 13, 2016 , ... ... on the environmental impact of American businesses. , The increasingly modern world of ... rely more often on non-renewable energy sources such as oil and coal, which pollutes ...
(Date:2/13/2016)... Canada (PRWEB) , ... February 13, 2016 , ... In ... foot forward. They’ll groom themselves to perfection, go out of their way to be ... date – just take a look at any online dating profile. , A ...
(Date:2/12/2016)... ... February 12, 2016 , ... The law firm of Morrow, ... Parishes. The purpose of these scholarships is to encourage applicants to pursue a ... seek employment within these two parishes. , “We have available jobs in St. ...
(Date:2/12/2016)... Falls Church, VA (PRWEB) , ... February 12, ... ... in Store?, Feb. 29, 2016 — 1:30 p.m. – 3:00 p.m. EST, ... burner issue in the life cycle of pharmaceutical products, garnering increased attention from ...
(Date:2/12/2016)... ... February 12, 2016 , ... T.E.N., a technology and information ... ISE Southeast Awards 2016. Finalists and winners of the ISE® Awards for both ... and Awards Gala on March 15, 2016 at the Westin Peachtree Plaza, Atlanta. ...
Breaking Medicine News(10 mins):
(Date:2/11/2016)... , Feb. 11, 2016 Potrero Medical, Inc., the ... to announce the appointment of George M. Rapier, III ... San Antonio, TX , WellMed is one of the ... patients and HMO members in Texas ... 1990 out of his own internal medicine practice, he has ...
(Date:2/11/2016)...  MiMedx Group, Inc. (NASDAQ: MDXG ), the ... other birth tissues, human skin and bone, and patent-protected ... products and therapies, announced today that it will present ... in New York , NY.  Parker ... Senken , Chief Financial Officer and Chris Cashman ...
(Date:2/11/2016)... , Feb. 11, 2016  AfterPill.com is reporting ... recommend alcohol abstinence for all women who are at ... the U.S. each year and raises the risks of ... --> According to the Guttmacher Institute, ... of women of child-bearing age, who have sex without ...
Breaking Medicine Technology: