Navigation Links
Calcium plus vitamin D supplementation is not associated with a reduced breast cancer risk
Date:11/11/2008

Taking calcium and vitamin D supplements does not reduce breast cancer incidence in postmenopausal women, according to data from a randomized, doubled-blind, placebo-controlled trial published online November 11 in the Journal of the National Cancer Institute.

Several observational and preclinical studies have suggested that vitamin D supplements may reduce breast cancer risk, but results have been inconsistent.

To test this possibility, researchers evaluated breast cancer incidence as a secondary endpoint in the Women's Health Initiative study in 36,282 postmenopausal women who were randomly assigned to take 1,000 mg of calcium plus 400 IU of vitamin D daily or to daily placebo. (The primary endpoint of the study was effect of the supplements on hip fracture.) Baseline 25-hydroxyvitamin D levels were determined in all 1,067 breast cancer cases and 1,067 matched control subjects.

In the current analysis, Rowan Chlebowski, M.D., Ph.D., of the Los Angeles Biomedical Research Institute at Harbor-University of California Los Angeles Medical Center and colleagues found that the incidence of invasive breast cancer was similar in the supplement and placebo groups, with 528 and 546 cases, respectively. Additionally, 25-hydroxyvitamin D levels were only modestly associated with dietary and supplement vitamin D intake and were not associated with breast cancer risk in a nested case-control analysis.

These findings call into question recommendations for evaluation of higher vitamin D dosage in future studies, according to the authors. Furthermore, as 25-hydroxyvitamin D levels were strongly associated with leanness and high physical activity, which both influence breast cancer risk, prior observational studies relating vitamin D levels to breast cancer risk may have been influenced by these factors. "The main findings do not support a causal relationship between calcium and vitamin D supplement use and reduced breast cancer incidence" the authors conclude.

In an accompanying editorial, Corey Speers and Powel Brown, M.D., Ph.D., of Baylor College of Medicine in Houston applaud the authors' efforts to test the question in such a rigorous manner. Although the editorialists agree that these data do not support an association between calcium and vitamin D supplementation and breast cancer incidence, they argue that further investigation is still needed to adequately answer the question, including looking for genetic influences on vitamin D serum levels, testing supplements in premenopausal women, and following study participants for a longer follow-up period.

"Because preclinical, epidemiological, and clinical trial results of vitamin D supplementation are conflicting, additional studies will be needed to determine whether vitamin D plus calcium will prevent breast cancer. However, this article by Chlebowski [and colleagues] offers an important first step in addressing this issue," the editorialists write. "The potential health benefits of vitamin D and calcium may yet still have a bright future."


'/>"/>

Contact: Liz Savage
jncimedia@oxfordjournals.org
301-841-1287
Journal of the National Cancer Institute
Source:Eurekalert

Related medicine news :

1. Daily Calcium Does Protect Bone
2. International study strengthens case for daily calcium pill
3. Coronary Artery Calcium May Raise Womens Heart Risk
4. Calcium Supplements Could Raise Heart Risks in Postmenopausal Women
5. Scripps scientists find calcium channel blockers help normalize lysosomal storage disease cells
6. High Calcium Intake May Not Help Prevent Fractures, Reports The Harvard Health Letter
7. Calcium Scans Help Predict Coronary Risk
8. African Americans at Risk for Low Calcium Intake - New Survey Finds Those Experiencing Symptoms of Lactose Intolerance May be Sidelining Dairy in Their Diets
9. Study shows that administering calcium and magnesium effectively reduces neurological sensitivity
10. Coronary calcium distribution tied to heart attack risk
11. New Calcium Measure Better Predictor of Heart Risks
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/9/2016)... Florida (PRWEB) , ... February 09, 2016 , ... ... cold therapy products, announced today the introduction of the newly designed, innovative shoulder ... comfort and better cold therapy coverage for the injured arm and shoulder to ...
(Date:2/9/2016)... ... February 09, 2016 , ... Sir Grout, the leading ... proud to announce that many of their franchises have received the Super Service ... surface restoration franchises received customer recognition through positive reviews and testimonials, as well ...
(Date:2/9/2016)... ... February 09, 2016 , ... The Brain ... won. A team from 21st Century Medicine (21CM) ( http://www.21cm.com/ ), spearheaded ... delicate neural circuits of an intact rabbit brain for extremely long-term storage using ...
(Date:2/8/2016)... , ... February 08, 2016 , ... ... with BASF Human Nutrition into the Food & Beverage and ... been BASF’s channel partner throughout Canada and USA geographies east of the Rocky ...
(Date:2/8/2016)... ... February 08, 2016 , ... The Valentine’s Season is famous for gift giving with flowers, chocolates ... they are loved. This year, for more than 5.6 million Americans suffering with Alzheimer’s, ... be enough to remind them of the lives they’ve led and the people they’ve touched. ...
Breaking Medicine News(10 mins):
(Date:2/8/2016)... LONDON , Feb.8, 2016 Aesthetic Devices ... GlobalData,s Medical Devices sector report, "Aesthetic Devices - Medical ... Devices currently in pipeline stage. This ... secondary and primary research by GlobalData,s team of industry ... be removed or altered based on the availability and ...
(Date:2/8/2016)... 8, 2016  Neurocrine Biosciences, Inc. (Nasdaq: NBIX ... fourth quarter and year-end 2015 results after the Nasdaq ... then host a live conference call and webcast to ... Thursday afternoon, February 11, 2016 at 4:30 p.m. Eastern ... --> http://www.neurocrine.com . --> Participants ...
(Date:2/8/2016)... , Feb. 8, 2016   GS1 US ... professionals to guide them through GS1 Standards implementation to ... Administration (FDA) Unique Device Identification (UDI) rule. ... US; Beth Gibson , senior director industry development, ... industry development director, GS1 US --> ...
Breaking Medicine Technology: