Breast cancer patients given tamoxifen are more than four times more likely to develop a more aggressive tumour than those not prescribed the drug, scientists have warned.
A study of over 1,000 patients found the oestrogen blocking drug reduced the risk of the most common, easy to treat cancer recurring by 60 per cent.
But the chances of a rarer type not sensitive to the female hormone appearing in the opposite breast increased by an alarming 440 per cent…..
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