By James Gallagher
Health reporter, BBC News
A gene has been linked to 70% of hard-to-treat breast cancers which are resistant to hormone therapies, in US research.
The study published in Nature used a new technique which tested hundreds of genes at once, rather than one at a time.
Scientists said there was "a lot of potential for significant impact" if drugs could be developed.
Cancer Research UK said it would be interesting to see where the study led.
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more:
http://www.bbc.co.uk/news/health-14152095