Langtidsbehandling (mindst 5- 10 år) af hysterektomerede kvinder med østrogen alene har i nogle epidemiologiske studier været forbundet med en øget risiko for ovariecancer.
Ovarian cancer Long-term (at least 5-10 years) use of oestrogen-only HRT products in hysterectomised women has been associated with an increased risk of ovarian cancer in some epidemiological studies.