trial or observed group · 2025 · landmark
“During the last decade, early-onset colorectal cancer incidence rates remained stable in 23 countries but increased in 27 countries with the fastest rises in New Zealand (AAPC 3·97% [95% CI 2·44–5·52]), Chile (3·96% [1·25–6·74]), Puerto Rico (3·81 [2·68–4·96]) and England (3·59% [3·12–4·06]).”
Colorectal cancer incidence trends in younger versus older adults: an analysis of population-based cancer registry data. Lancet Oncol
Who: Colorectal cancer diagnoses in adults aged 25-49 vs 50-74 years from 135 population-based registries (WHO-IARC CI5plus) in 50 countries and territories
PMID 39674189
systematic review · 2020 · landmark
“Altogether, we found an increasing incidence of yCRC with a worldwide pooled APCi of + 1.33 (95% CI, 0.97 to 1.68; p < 0.0001), that is largely driven by increasing incidence in the USA, Australia, and Canada with reported overall APCi’s up to + 7.9 (95% CI, 1.1 to 15.1) [ 26 ] and nearly 30% increased incidence over 20 years [ 4 , 6 ].”
Trends in the epidemiology of young-onset colorectal cancer: a worldwide systematic review. BMC Cancer
Who: Peer-reviewed observational studies of young-onset colorectal cancer (mostly defined as under 50) trends in 12 countries across five continents
PMID 32252672
trial or observed group · 2026 · landmark
“Incidence in individuals 20–49 years (early onset) has risen by 1%–2% annually since the mid‐1990s driven mostly by advanced‐stage diagnoses and left‐sided tumors (Figures 4 and 5 ).”
Colorectal cancer statistics, 2026. CA Cancer J Clin
Who: US population; SEER and NPCR registry data compiled by NAACCR covering >99% of the population, plus NCHS death certificate data
PMID 41769777
other primary study · 2024 · landmark
“In brief, our findings indicated that the incidence and prevalence rates of EO-CRC exhibited an upward trend, while the mortality and DALYs rates demonstrated a downward trajectory from 1990 to 2021 globally.”
Global burden and cross-country health inequalities of early-onset colorectal cancer and its risk factors from 1990 to 2021 and its projection until 2036. BMC Public Health
Who: Modelled GBD 2021 estimates of early-onset colorectal cancer (age 15-49 years) in 204 countries and territories
PMID 39533235
other primary study · 2026 · landmark
“In summary, we detected an overall increasing incidence of early-onset CRC in all 4 countries, with a decreasing incidence or plateauing of late-onset CRC, consistent with a cohort effect.”
Increase of early-onset colorectal cancer: a cohort effect. J Natl Cancer Inst
Who: Colorectal cancer cases in adults aged 20-74 (early onset 20-49) from CI5plus high-quality registries in Australia, Canada, England and the United States, by sex
PMID 40848248
other primary study · 2017
“The overall age-standardized incidence of CRC significantly increased from 2.1 to 4.8 per 100,000 AYA population between 1982 and 2007, APC = 3.0 (95% CI 0.7–5.5), p = 0.024 (Table 1 ).”
Increasing Incidence of Colorectal Cancer in Adolescents and Young Adults Aged 15-39 Years in Western Australia 1982-2007: Examination of Colonoscopy History. Front Public Health
Who: Adolescents and young adults aged 15-39 years with incident colorectal cancer registered with the Western Australia Cancer Registry, linked to hospital and death records
PMID 28791283