Early-Onset Cancer on the Rise in England: A New Study Reveals Complex Trends
A major new study published in BMJ Oncology has analyzed two decades of cancer data in England, revealing a troubling increase in early-onset cancers among adults under 50. The research, which examined data from the National Disease Registry Service between 2001 and 2019, highlights significant shifts in cancer incidence, particularly among younger women.
Key Findings: A Generational Shift
The study compared cancer patterns across two age groups—20-49 year olds and those aged 50+—for over 20 cancer types. The results were stark:
New cases of 16 out of 22 cancers in younger women increased significantly between 2001 and 2019, compared to 11 out of 21 cancers in younger men.
Among the under-50s, significant rises were observed in 11 cancers known to have behavioral risk factors: thyroid, multiple myeloma, liver, kidney, gallbladder, bowel, pancreatic, endometrial, mouth, breast, and ovarian.
Notably, rates of bowel and ovarian cancers rose only among younger adults, not their older counterparts. Five cancers—endometrial, kidney, pancreatic, multiple myeloma, and thyroid—increased significantly faster in younger women than in older women. Multiple myeloma also rose faster in younger men than in older men.
The Role of Behavioral Risk Factors
Researchers used national health surveys to examine trends in key risk factors: smoking, alcohol intake, diet, excess weight (BMI), and physical inactivity. The findings challenge simple assumptions about what is driving the surge:
- Except for mouth cancer, all 11 early-onset cancers were associated with obesity.
- Six cancers were linked to smoking, four to alcohol, three to physical inactivity, and one to dietary factors.
However, trends in most risk factors (except excess weight) have been stable or improving for younger adults over the past one to two decades. For example:
- Red meat consumption decreased: younger men went from 38g/day (2008) to 17g/day (2018); younger women from 22g to 10g.
- Over 90% of younger adults did not consume enough fiber in 2018, but intake was stable or slightly improved from 2009 to 2019.
The Obesity Paradox and Other Unknowns
Established behavioral risk factors still accounted for a substantial share of cancer cases in 2019 (e.g., 68%-65% of mouth cancers in younger and older men, 42%-48% of liver cancers). Excess weight was the risk factor associated with most cancers, ranging from 5% for ovarian to 37% for endometrial cancers.
"The rising incidence despite declining trends in several behavioral risk factors may reflect multiple influences, including unmeasured factors such as reproductive history, early-life exposures, and changes in diagnosis practices." — Study Authors
Critically, both BMI-attributable and BMI-non-attributable incidence rates have increased, suggesting other contributors beyond excess weight. Researchers pointed to potential culprits including ultra-processed foods, childhood obesity, physical inactivity, antibiotic use, sweetened drinks, and air pollution.
Important Context and Caveats
The researchers caution that the absolute cancer burden remains far higher in older adults. They also note significant limitations:
- This is an observational analysis and cannot establish cause and effect.
- No consistent long-term national data were available for several risk factors.
- The analysis was restricted to England, not the entire UK.
- Findings assumed a 10-year lag between exposure and cancer incidence.
The patterns suggest that while similar risk factors across ages are likely, some cancers may have age-specific exposures, susceptibilities, or differences in screening and detection practices. This study underscores the need for continued research into the complex drivers of early-onset cancer.