January 2, 2015
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1:20Now PlayingSubscribe to BBC News www.youtube.com/bbcnews
New research suggests most types of cancer are the result of bad luck, rather than unhealthy lifestyles, diet or even inherited genes.
A study in the United States looked at 31 different types of cancer - and found that the majority were caused by chance mutations that could not be prevented. Kate Bee reports.
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