Why wait until you are diagnosed with cancer, if you can hunt it down before it could kill you? Why not get a simple high tech CT scan to see if you are harbouring signs of pre-disease in your heart, your lungs, your breasts or your bowels? Those are the questions that dog Health Researcher Alan Cassels as he voyages inside the world of cancer screening, taking him from his own doctor's office to the world's biggest medical meeting.

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