Statistics from around the world are now clear: the rates of more than a dozen cancers are increasing among adults under the age of 50. In the United States, colorectal cancer - which typically strikes men in their mid-60s or older - has become the leading cause of cancer death among men under 50.
Friends and family members were also developing improbable forms of cancer. 'And then I made a mistake people should never do,' says Barreto, now at Flinders University in Adelaide, Australia. 'I promised them I would get to the bottom of this.'
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