I read this and the linked studies, plus some other articles including three on the BMJ. They're all talking about increased cancer mortality with sharp increases in younger to middle aged adults.
They're all setting 1990 as a baseline - a "trigger point" if you want to be dramatic. I wondered what all-cause mortality has looked like over that period.
If cancer deaths have increased while other causes stayed much the same, we would see rises in mortality rates (excluding the Covid pandemic, which skyrocketed mortality).
But if people are dying LESS of other causes, that means more people stay alive longer to develop cancer. I found the numbers here: https://www.ox.ac.uk/news/2024-03-21-new-study-highlights-troubling-trends-midlife-mortality-us-and-uk
Mortality has fallen significantly for each group except young American women. They've got a problem.
What this chart shows is simply that people aren't dying as young as they did before 1990. All this hand-wringing may be quite out of place, because our unhealthy lifestyles are actually keeping us healthy for much longer! This could easily mean that we're seeing more cancer because nothing else got to those people first.
This review looks at the troubling upticks in mortality among younger people in the US and UK. The big rises in the USA were largely due to self-inflicted causes, notably drugs, and we might be following suit. Other interesting issues were raised, if you fancy reading it. It's short.
This does suggest, however, that if young people carry on killing themselves and each other with reckless behaviour, we'll see a rise in mortality ... but cancer diagnoses in these groups will go back down.