London Telegraph 
Wednesday, Aug 6, 2008
The Prince, 87, is understood to be suffering from the condition that affects around 60 per cent of men of his age and is undergoing regular blood tests.
However Buckingham Palace broke its usual silence on such issues to rigerously deny reports that he has been diagnosed with cancer.
“The Duke of Edinburgh has authorised us to confirm that the claim made by the Evening Standard that he has received a ‘diagnosis of prostate cancer’ is untrue,” the statement said.
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Doctors are thought to have discovered the problem when he was admitted to the King Edward VII hospital with a chest infection in April.