Hormone replacement therapy reviewing the evidence

A rapid review article in this week's issue of THE LANCET weighs up the current evidence for the health outcomes of hormone replacement therapy (HRT) use. The review--which includes data from the recently published Womens Health Initiative (WHI) study--provides consistent evidence to refute the widely held view that HRT may be protective against coronary heart disease. The review also points to the consistent evidence across trials suggesting that HRT use is associated with an increased risk of stroke.

HRT has been used increasingly across western populations since the early 1990s--an estimated 20 million women in western countries were using HRT at the end of the past decade. Around a third of women in their fifties in the UK use HRT for an average of five years, with a similar proportion in the rest of Europe. The impact of HRT on health outcomes has been widely debated, with suggestions that HRT use may increase the risk of certain cancers--notably breast cancer--while also being protective against osteoporosis and coronary heart disease.

Valerie Beral and colleagues from Cancer Research UK's Epidemiology Unit, Oxford, UK, reviewed the existing data on the effects of HRT on seven life-threatening conditions--largely based on data from four randomised trials, one involving an oestrogen-only treatment, the others using a combined oestrogen/progestagen combination--to provide an up-to-date analysis of the long-term effects of HRT use.

Evidence from the four HRT trials (which included over 20,000 women followed up for around five years) showed that HRT users are at an increased relative risk of breast cancer, pulmonary embolism (blood clot in the lung), and stroke, compared with women given placebo.

HRT was found to be protective against colorectal cancer and hip fracture. There were no significant differences in the risks of endometrial cancer or coronary heart disease, and not enough data to assess the relationship between HRT use

Contact: Richard Lane

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