A comprehensive analysis of cancer incidence in England has revealed that 11 types of cancer are becoming more common among adults aged 20 to 49, yet the increase cannot be fully explained by changes in lifestyle. The study, conducted by the Institute of Cancer Research and Imperial College London, examined data from 2001 to 2019 and highlights a troubling trend that demands further investigation.
The cancers identified include breast, colorectal, pancreatic, kidney, liver, gallbladder, thyroid, oral, endometrial, and ovarian cancers, as well as multiple myeloma, a blood cancer. For most of these, rates also rose in older adults, suggesting shared risk factors across age groups. However, colorectal and ovarian cancers stood out: their incidence increased only in younger adults, pointing to unique factors affecting this demographic.
Lifestyle Factors Fall Short
The researchers evaluated well-known risk factors such as smoking, alcohol consumption, diet, physical activity, and body weight. They estimated that these factors account for between 7% and 65% of certain cancers, depending on the type. Yet, most of these risks have not risen among younger adults in recent decades. Smoking rates have declined, alcohol use has stabilised or fallen, physical inactivity has generally decreased, and consumption of red and processed meat has dropped.
Obesity was the notable exception, having increased steadily across all adult age groups. But even for cancers strongly linked to higher body weight—such as bowel, kidney, pancreatic, liver, gallbladder, and womb cancers—the rise could not be fully attributed to obesity alone. This suggests that other, less understood factors are at play.
“Known lifestyle factors are a small piece of the puzzle,” the researchers stated, emphasising the urgent need to explore emerging risk factors, early-life exposures, and the impact of improved detection and screening practices. The findings echo broader European concerns about cancer trends, as similar patterns have been observed in other countries, though data remain limited.
The study’s implications extend beyond England, given the shared healthcare challenges across Europe. For instance, the European Union’s Beating Cancer Plan aims to address prevention and early detection, but this research underscores that lifestyle interventions alone may not suffice. The rise in colorectal cancer among younger adults, in particular, mirrors trends in Germany and France, where screening programmes are being expanded.
While the study does not pinpoint specific causes, it calls for a deeper investigation into environmental factors, such as exposure to pollutants or microplastics, and changes in gut microbiome composition. The researchers also noted that increased testing and awareness might contribute to higher detection rates, but this cannot explain the full magnitude of the increase.
For Europe, where cancer remains a leading cause of death, these findings highlight the need for coordinated research across member states. The European Commission’s Horizon Europe programme could play a key role in funding studies that examine these emerging risks, particularly in younger populations.
As the continent grapples with rising healthcare costs and an ageing population, understanding why cancers are striking earlier could reshape prevention strategies. The study serves as a reminder that even in an era of declining smoking rates and improved diets, new threats may be emerging that require a fresh scientific approach.
