Drug that prevents half of breast cancers carries on working

A drug that halves a woman’s risk of breast cancer continues to work long after they stop taking it, say researchers.

The drug, Anastrozole, blocks the production of the hormone oestrogen, which fuels the growth of many breast cancers. It halves the risk of breast cancer during the first five years. Now, however, trials on 3,864 women show those taking it had 49% fewer breast cancers, even seven years after stopping treatment.

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