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Billions of dollars spent on cancer research have yielded no great breakthrough yet. There are other ways to attack the problem, says physicist Paul Davies

As the US faces up to its "fiscal cliff" of massive spending cuts, a major issue is burgeoning health costs. High on the list of those costs is cancer therapy, with the clamour for hugely expensive drugs - many of which have little or no clinical benefit - set to grow as baby boomers age.

Cancer research swallows billions of dollars a year, but the life expectancy for someone diagnosed with cancer that has spread to other parts of the body has changed little over several decades. Therapy is often a haphazard rearguard action against the inevitable. And the search for a general cure remains as elusive as ever.

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