Hormone Therapy (HT) is a good option for most women over age 65, despite entrenched fears about HT safety, according to findings from a new study published in Menopause.
The study, led by Seo H. Baik, PhD, of Lister Hill National Center for Biomedical Communications, National Library of Medicine, in Bethesda, Maryland, and colleagues is based on the health records of 10 million senior women on Medicare from 2007 to 2020. It concludes there are important health benefits with HT beyond age 65 and the effects of using HT after age 65 vary by type of therapy, route of administration, and dose.
Controversial Since Women’s Health Initiative
Use of HT after age 65 has been controversial in light of the findings of the Women’s Health Initiative (WHI) study in 2002. Since that study, many women have decided against HT, especially after age 65, because of fears of increased risks for cancers and heart disease.
Baik et al. concluded that, compared with never using or stopping use of HT before the age of 65 years, the use of estrogen alone beyond age 65 years was associated with the following significant risk reductions: mortality (19%); breast cancer (16%); lung cancer (13%); colorectal cancer (12%); congestive heart failure (5%); venous thromboembolism (5%); atrial fibrillation (4%); acute myocardial infarction (11%); and dementia (2%).
The authors further found that estrogen plus progestin was associated with significant risk reductions in endometrial cancer (45%); ovarian cancer (21%); ischemic heart disease (5%); congestive heart failure (5%); and venous thromboembolism (5%).
Estrogen plus progesterone, however, was linked with risk reduction only in congestive heart failure (4%).
Reassuring Results
“These results should provide additional reassurance to women about hormone therapy,” said Lisa C, Larkin, MD, president of The Menopause Society. “This data is largely consistent with the WHI data as we understand it today — that for the majority of women with symptoms transitioning through menopause, hormone therapy is the most effective treatment and has benefits that outweigh risks.”
There may be some exceptions, she noted, particularly in older women with high risk for cardiovascular disease and stroke. Among those women, she explained, the risks of HT may outweigh the benefits and it may be appropriate to stop hormone therapy.
“In these older women with specific risk factors, the discussion of continuing or stopping HT is nuanced and complex and must involve shared decision-making,” she said.
Elevated Breast Cancer Risk Can be Mitigated
With a therapy combining estrogen and progestogen, both estrogen plus progestin and estrogen plus progesterone were associated with a 10%-19% increased risk of breast cancer, but the authors say that risk can be mitigated using low doses of transdermal or vaginal estrogen plus progestin.
“In general, risk reductions appear to be greater with low rather than medium or high doses, vaginal or transdermal rather than oral preparations, and with E2 (estradiol) rather than conjugated estrogen,” the authors write.
The authors report that over 14 years of follow-up (from 2007 to 2020), the proportion of senior women taking any HT-containing estrogen dropped by half, from 11.4% to 5.5%. E2 has largely replaced conjugated estrogen (CEE); and vaginal administration largely replaced oral.