2023-09-10 10:29:00
Are we facing a galloping global epidemic? The number of people under 50 diagnosed with cancer has increased by 80% worldwide over the last three decades, according to a large study published Wednesday September 6 by the british magazine BMJ Oncology.
Previous research had already noted increasingly frequent cancer diagnoses among those under 50. A previous study published in September 2022 in the journal Nature Reviews Clinical Oncology had thus noted that the incidence of 14 types of cancer had increased considerably in these age groups between 2000 and 2012. But the contribution of BMJ Oncology shows that this trend is not reversing, on the contrary.
Some cancers grow more quickly
To reach this conclusion, researchers used data from the 2019 Global Burden of Disease study, analyzing rates of 29 different cancers in 204 countries. It appears that just over a million people under the age of 50 died of cancer that year (+ 28% compared to 1990). The deadliest cancers were those of the breast, trachea, lung, intestine and stomach.
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And if breast cancer has been the most frequently diagnosed over the three decades, the cancers which have increased most rapidly are those of the nasopharynx and the prostate. A large number of other cancers linked to the digestive sphere are also more often listed.
The cause of this exponential growth “is still unclear”
According to experts, part of this increase can be explained by population growth. But not only. The development of screening has certainly contributed to this increase but also in a weak proposition, since this explosion of cases also appears in countries which have no screening program.
Therefore, lifestyle remains a risk factor: in addition to poor diet, smoking and alcohol consumption, a sedentary lifestyle and obesity might also contribute to this trend, according to the study. Genetic factors might also contribute to this trend, as can environmental factors. Researchers admit that the cause of early cancer growth “is still not clear”.
And it’s not over…
The number of cancer cases worldwide among those under 50 is expected to increase by another 31% by 2030, mainly among people aged 40 to 49, according to modeling carried out by researchers. They note, however, that cancer data from different countries varies widely, with developing countries potentially underreporting cases and deaths.
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