Were so used to hearing about the importance of regular cancer screening " catch it in its early stages while it can still be treated. But the reality is more complex and screening has real side effects. Scientists have known about these risks for years, but is the message getting across to patients? Join Gary Kerr to debate the big issues in cancer screening. Do we need to start telling people about the risks of screening or should we keep it in the small print? Does screening destroy more lives than it saves?