Studies. Cancer, now the leading cause of death in rich countries

Heart disease represents more than 40% of deaths, or about 17.7 million deaths in 2017. The authors, whose work is presented at the Congress of the European Society of Cardiology (ESC) in Paris, point to the heavy toll paid by poor countries to these pathologies.

Cancer, the second most common cause of death in the world in 2017, accounts for just over one-quarter (26%) of all deaths.

But in rich countries, cancer now kills more people than heart disease, according to research, limited to 21 countries, published in the medical journal The Lancet.

The four high-income countries taken into account are Canada, Saudi Arabia, Sweden and the United Arab Emirates.

"The world is witnessing a new epidemiological transition (…), cardiovascular disease is no longer the leading cause of death in high-income countries," said Gilles Deganais, professor emeritus at Laval University, Quebec and co-author of both publications.

But as global rates of heart disease decline, cancer could become the leading cause of death worldwide "in the next few decades," he says.

The study covers more than 160,000 adults followed over a decade (between 2005 and 2016), in high-, middle- and low-income countries.

According to this work, people in poor countries are on average 2.5 times more likely to die of heart disease than those in rich countries.