Navigation Links
Hormone therapy begun at menopause may pose risk for breast cancer
Date:1/28/2011

Starting hormone therapy at around the time of menopause is associated with a greater risk of breast cancer compared to starting after a longer gap, according to a study published online Jan. 28 in The Journal of the National Cancer Institute. In this large, prospectively followed cohort of women, those who started hormone therapy five years or more after menopause had little or no increased risk, regardless of the type of hormone therapy used, how long they used it, and whether they were overweight or obese.

Many studies have established that breast cancer incidence increases in users of hormonal therapy, in particular among women who use an estrogen-progestin combination as opposed to estrogen-alone. Few studies have looked at the timing of hormone therapy as a risk factor, although two previous studies suggested the interval between menopause and initiating hormone therapy may influence breast cancer risk.

To investigate this question, Valerie Beral, FRS, of Oxford University and colleagues, used data from the Million Women Study (MWS) in the UK. The researchers estimated the adjusted relative risks of breast cancer in hormone therapy users and past users compared to non-users in 1.13 million women in the study. They also compared women on different types of hormone therapy.

They found that women starting hormone therapy at the time of menopause were at greater risk of breast cancer than those starting it later. They write, "A new finding of this study, which has been little investigated previously, is that the interval between menopause and starting hormonal therapy has a substantial effect on breast cancer risk."

Two previous studies have suggested this association but only in certain subgroups. "In this large study, we found greater risks of breast cancer if hormonal therapy use began either before or soon after menopause than after a longer gap; and this pattern of risk was seen across different types of hormonal therapy, among women who used hormonal therapy for either short of long durations, and also in lean and in overweight and obese women."

In an accompanying editorial, Rowan T. Chlebowski, M.D., Ph.D., of Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center and Garnet Anderson from the Fred Hutchinson Cancer Research Center note the study provides substantial support for similar findings from the Women's Health Initiative (WHI) in the U.S. They add that the similarities between the patterns of breast cancer risk in these two large studies increase the likely validity of the results, especially since the methodologies of the two studies were quite different.

The editorialists also discuss discrepancies in the two studies' findings regarding the risk of estrogen-only hormone therapy; the WHI found little risk associated with estrogen alone while the MWS found a statistically significant increased risk, except in overweight and obese women. They conclude that "the question of the effect of estrogen-only formulation use on breast cancer risk in postmenopausal women, even with longer-term hormone use, still stands unanswered."


'/>"/>

Contact: Kristine Crane
jncimedia@oxfordjournals.org
301-841-1285
Journal of the National Cancer Institute
Source:Eurekalert

Related medicine news :

1. Pioneering Hormone Therapist to Host Free Health Seminar
2. Hormone May Prevent Aggressive Breast Cancer
3. Bonding Hormone Might Help Some With Autism
4. WHI data confirm short-term heart disease risks of combination menopausal hormone therapy
5. Early On, Hormone Therapy May Raise Womens Heart Risks
6. Testicular Cancer Survivors May Have Hormone Deficiency
7. Stress hormone, depression trigger obesity in girls
8. Buy HGH Website Educates Consumers on the Pros and Cons of Human Growth Hormone Supplements
9. Hormone thought to slow aging associated with increased risk of cancer death
10. Hormone Outperforms Insulin in Diabetic Mice
11. High Hormone Level Linked to Cancer Death in Older Men
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/16/2017)... California (PRWEB) , ... August 16, 2017 , ... An August 3rd article ... was the subject of a report in JAMA (the Journal of the American Medical Association). ... 50 were able to achieve BMIs under 30, when compared to patients with lower BMIs. ...
(Date:8/16/2017)... ... 16, 2017 , ... For the second year, the Brain ... educate the public on the impact of concussions. Brooke Mills, student and founder ... Awareness Day. , Brooke is working diligently is to raise awareness of concussion ...
(Date:8/16/2017)... Island, NY (PRWEB) , ... August 16, 2017 , ... ... with IV starts and blood draws. By broadly deploying AccuVein devices, Maury Regional Medical ... takes much of the guesswork out of a needle stick and more importantly, helps ...
(Date:8/16/2017)... YORK, NY (PRWEB) , ... August 16, 2017 , ... ... for better treatments and ultimately, a cure. , The grants are awarded through ... comprised of scientists with a wide array of backgrounds and expertise in all areas ...
(Date:8/16/2017)... ... August 16, 2017 , ... ... eBook, 9781498499620    ) shares that during the time of a cancer diagnosis, surgery and ... God's love, and all the many ways God shows love to those who ...
Breaking Medicine News(10 mins):
(Date:7/31/2017)... Tenn. , July 31, 2017 Three Tru-D SmartUVC ... Yongsan, South Korea . Tru-D, short for "Total Room ... and operating rooms after an environmental services (ES) professional cleans the area ... ... "Although the ...
(Date:7/28/2017)... 2017 Hill-Rom Holdings, Inc. ("Hill-Rom") (NYSE: HRC), ... ended June 30, 2017, and updated its financial outlook ... For the fiscal third quarter, Hill-Rom reported earnings ... diluted share in the prior-year period. These results reflect ... diluted share primarily related to the non-cash write-down of ...
(Date:7/27/2017)... WARSAW, Ind., July 27, 2017  Zimmer Biomet Holdings, ... the quarter ended June 30, 2017.  The Company reported ... of 1.1% over the prior year period, and an ... approximately 240 basis points of contribution from the LDR ... from the second quarter of 2016, or 0.3% on ...
Breaking Medicine Technology: