Breast cancer deaths can be halved after 10 years of treatment with the drug tamoxifen, research shows.

The widely-used drug prevents oestrogen fuelling breast cancer in hormone-sensitive patients.

The new trial looked at the effect of taking tamoxifen for a total of 10 years after diagnosis.

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The trial, led by Dr Christina Davies from Oxford University, recruited almost 7000 women with oestrogen-sensitive cancer who were completing five years of tamoxifen treatment. Half stopped their treatment immediately while the remainder con-tinued taking the drug for five more years.

The risk of dying during the second decade after diagnosis was further reduced by about one- quarter, leading to a total halving of death rates.