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Breast cancer gene is found

A GENE which reduces the risk of breast cancer in younger women by altering oestrogen levels has been identified for the first time.

At least 40pc of breast cancers are thought to be linked to high oestrogen levels, but the connection has so far only been established in post-menopausal women.

Now researchers have identified a genetic mutation which is directly linked to lower oestrogen levels and reduced breast cancer risk in younger women.

The finding represents an "important step forward", researchers said.