for years, scientists have been trying to develop a simple blood test that could detect cancers before any symptoms became obvious, but they really struggled, because the tests just weren't accurate enough. there were either too many false positives or false negatives. now, though, they think they have made a real breakthrough. so, technology is really what's made the difference here. first of all, we need to be able to detect really minute quantities of dna in our blood, and our ability to do that has improved markedly over the last several years. the second thing is the power of modern computing, really. so we've looked at data from tens of thousands of people and we've used that data to really optimise the test. this is just the start of a clinical trial, but if the promise of this simple test is fulfilled, it could mark the beginning of a revolution in cancer treatment. dominic hughes, bbc news, runcorn. we can now speak to sara hiom, who is the director of cancer intelligence at grail uk.
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