Cancer now causes more deaths among the middle-aged in higher-income countries than cardiovascular disease, a study suggests.
Globally, heart problems and stroke is the leading cause of death at this age.
But the researchers say people in rich nations are 2.5 times more likely to die of cancer than cardiovascular disease in their middle years.
In poorer nations, the reverse is true – with cardiovascular disease three times more likely to claim the lives.
The study, published in the Lancet, is drawn from a global research programme following the lives of thousands of people from across 21 countries. People from the UK are not involved.
Researchers led by a team from Canada's McMaster University looked at the fate of 160,000 people enrolled in the programme, between 2005 and 2016.
These people had an average age of 50 at the start.
There were more than 11,000 deaths, with those in low-income countries nearly four times more likely to die than those in high-income countries.
In about 2,000 cases, the cause of death was unclear.
Of the others, cardiovascular disease caused more than 40% in middle- and low-income countries but less than a quarter in high-income countries.
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