Hormone Therapy May Increase Breast Cancer Risk
In new analysis, researchers found risk highest when used just before menopause
By Kathleen Doheny
FRIDAY, March 29 (HealthDay News) -- Women who take hormone therapy that includes estrogen and progestin are at increased risk of developing breast cancer and dying from it, especially if they start taking the therapy just as menopause begins, a new analysis confirms.
Researchers followed nearly 42,000 women, all of whom were past menopause, for an average of more than 11 years. Of those, more than 25,000 did not use hormone therapy and more than 16,000 took estrogen and progestin, also called combined hormone therapy. For this analysis, the researchers did not include estrogen-only therapy, used by women who have had a hysterectomy.
At the end of the follow-up period, more than 2,200 of the women were found to have breast cancer. Compared to non-users, those who took combined therapy were more likely to have breast cancer, said Dr. Rowan Chlebowski, a medical oncologist at the Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center. Chlebowski led the study, which was published in the March 29 issue of the Journal of the National Cancer Institute.
The link has been found in other studies, but Chlebowski also found the risk was greatest among those who took the hormones closest to menopause. "Women starting within months of menopause had about a threefold greater risk than women starting 10 years after menopause," Chlebowski said.
For the new analysis, Chlebowksi looked at results from the Women's Health Initiative observational study. He compared the findings with those from the Women's Health Initiative randomized clinical trial, in which women were assigned to different treatments.
The Women's Health Initiative included four clinical trials and an observational study. Women were all past menopause and were aged 50 to 79.
Chlebowski said he did the new analysis to resolve what he saw as unanswered questions. In the trial, only about one-third, or 5,000, of the women were in their 50s when they started the study. As that is the typical age for menopause to start, about two-thirds of the women in the trial were in their 60s or beyond, so began to take hormones several years after menopause.