Modelling predicted that the number of global cancer cases in under 50s will rise a further 31 percent by 2030, mostly among people aged 40-49. The researchers acknowledged that cancer data from different countries varied greatly, with developing nations potentially under-reporting cases and deaths. Experts not involved in the study said the slower increase in deaths compared to cases was likely due to improvements in early detection and treatment. Dorothy Bennett, a researcher at the University of London, pointed out that the world's population grew by roughly 46 percent between 1990 and 2019, accounting for some of the increasing cases.