Featured Research

from universities, journals, and other organizations

Hair Straightening Chemicals Not Linked To Breast Cancer Risk In African-Americans

Date:
May 17, 2007
Source:
American Association for Cancer Research
Summary:
Chemical "relaxers" used to straighten hair are not associated with an increased risk of developing breast cancer among African-American women, say researchers who followed 48,167 Black Women's Health Study participants.

Chemical "relaxers" used to straighten hair are not associated with an increased risk of developing breast cancer among African-American women, say researchers who followed 48,167 Black Women's Health Study participants.

Related Articles


In the May issue of Cancer Epidemiology, Biomarkers & Prevention, researchers from Boston University and Howard University Cancer Center found no increase in breast cancer risk due to the type of hair relaxer used or the frequency and duration of use. Women who used relaxers seven or more times a year over a 20 year span or longer had the same risk as women who used the chemicals for less than a year, researchers say.

"This is good news," said the study's lead investigator, Lynn Rosenberg, Sc.D., professor of epidemiology at Boston University School of Public Health. "The present study is definitive that hair relaxers don't cause breast cancer, as much as an epidemiologic study can be."

Previous research shows that breast cancer incidence is higher among African-American women age 40 or younger than among Caucasian women of the same age, and this increased risk is not fully explained by known risk factors, such as race and family history. At all ages, African-American women are more likely to die of breast cancer than are Caucasian women. To shed light on these findings and to study potential causes of breast cancer and other serious illnesses that affect black women, the Black Women's Health Study was launched across the United States in 1995. More than 59,000 women completed an initial questionnaire and more than 80 percent have answered follow-up questions every two years since, including questions about use of hair relaxers.

Hair relaxers can enter the body through cuts or lesions in the scalp. These products are not fully monitored by the Food and Drug Administration, and thus could contain potentially harmful compounds, Rosenberg said. Manufacturers of hair relaxers and hair dyes are not required to list all ingredients of their products on the packages, as some may be considered trade secrets, she said.

"Because hair relaxers are more widely used by younger African-American women than they are used by older African-American women, a connection with increased risk of breast cancer in younger women seemed possible," Rosenberg said. "Also, millions of African-American women use hair relaxers, and substances that are used by millions of women over a span of many years should be monitored for safety."

The researchers found that younger women used hair relaxers more than older women did. They also discovered that the majority of women used hair relaxers before age 20 and a third used the chemicals at least seven times a year. But when they examined the association between use of hair relaxers and breast cancer, based on 574 newly diagnosed cases of breast cancer identified during the follow-up period, they found no connection between use of relaxers and breast cancer incidence overall or among the younger women, even if use had been frequent and of long duration.

The study was funded by the National Cancer Institute. Co-authors include Julie Palmer, Sc.D., and Deborah Boggs, M.S., of Boston University School of Public Health, and Lucile Adams-Campbell, Ph.D., of Howard University Cancer Center.


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. "Hair Straightening Chemicals Not Linked To Breast Cancer Risk In African-Americans." ScienceDaily. ScienceDaily, 17 May 2007. <www.sciencedaily.com/releases/2007/05/070517063024.htm>.
American Association for Cancer Research. (2007, May 17). Hair Straightening Chemicals Not Linked To Breast Cancer Risk In African-Americans. ScienceDaily. Retrieved November 26, 2014 from www.sciencedaily.com/releases/2007/05/070517063024.htm
American Association for Cancer Research. "Hair Straightening Chemicals Not Linked To Breast Cancer Risk In African-Americans." ScienceDaily. www.sciencedaily.com/releases/2007/05/070517063024.htm (accessed November 26, 2014).

Share This


More From ScienceDaily



More Health & Medicine News

Wednesday, November 26, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

From Popcorn To Vending Snacks: FDA Ups Calorie Count Rules

From Popcorn To Vending Snacks: FDA Ups Calorie Count Rules

Newsy (Nov. 25, 2014) — The US FDA is announcing new calorie rules on Tuesday that will require everywhere from theaters to vending machines to include calorie counts. Video provided by Newsy
Powered by NewsLook.com
Daily Serving Of Yogurt Could Reduce Risk Of Type 2 Diabetes

Daily Serving Of Yogurt Could Reduce Risk Of Type 2 Diabetes

Newsy (Nov. 25, 2014) — Need another reason to eat yogurt every day? Researchers now say it could reduce a person's risk of developing type 2 diabetes. Video provided by Newsy
Powered by NewsLook.com
Madagascar Working to Contain Plague Outbreak

Madagascar Working to Contain Plague Outbreak

AFP (Nov. 24, 2014) — Madagascar said Monday it is trying to contain an outbreak of plague -- similar to the Black Death that swept Medieval Europe -- that has killed 40 people and is spreading to the capital Antananarivo. Duration: 00:42 Video provided by AFP
Powered by NewsLook.com
Are Female Bosses More Likely To Be Depressed?

Are Female Bosses More Likely To Be Depressed?

Newsy (Nov. 24, 2014) — A new study links greater authority with increased depressive symptoms among women in the workplace. 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:

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