David Cameron has become the latest high-profile figure to back growing calls for the NHS to start screening men, or at least those at highest risk, for prostate cancer after being treated for it himself.

He joined Olympic cycling champion Chris Hoy and prostate cancer charities in saying that recent advances in diagnosing the disease mean that testing can be introduced that is much safer than traditional methods, which can produce both false-positive and false-negative results.

However, others, including Cancer Research UK, disagree.

On Thursday, the UK National Screening Committee will meet to discuss the latest evidence on the subject. The independent committee, which advises ministers, is under pressure to allow testing to begin of those men at highest risk: black men, those with

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