Owen Sharp, of the Prostate Cancer Charity, says the Abirateron drug allows prostate cancer patients to have "a full and active life."
The drug "improves the level of pain the men have...and means they can be full participants with their family and everyday activity at a time when they are coming towards the end of their life," he says.
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David Davis is hoping to push Brexit withdrawal talks towards discussions on a future trading relationship between the UK and EU.
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