An analysis from The University of Oxford showed there was an extra case for every 1,000 women taking HRT drugs for 5 years, from the age of 50.
HRT drugs are used to help ease the symptoms of the menopause, which can be so bad they interfere with day to day life.
Sir Richard Peto, the lead researcher said claims that there is no risk for short courses of HRT, "Simply isn't true".
Medical charities said the findings were robust, but said the risk did fall after HRT stopped.
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