Medical detection dogs

Can dogs smell cancer? Ever since Hippocrates the odour of disease has been used to aid diagnosis but has this simple technique been forgotten? Dr Mark Porter investigates the evidence for whether canine super noses can be used to accurately detect cancer. There have been plenty of anecdotes reported but what about hard science? Studies since 2004 from the Medical Detection Dogs Centre in Milton Keynes have shown convincing results and they've now teamed up with MIT in the US, specialists in 'e-noses'. Could devices the size of a mobile phone be used to sniff for disease?