Trends in the incidence of young-onset colorectal cancer with a focus on years approaching screening age: A population-based longitudinal study.

Background With recent evidence for the increasing risk of young-onset colorectal cancer (yCRC), our objective was to evaluate the incidence of yCRC in one-year age increments, particularly focusing around the screening age of 50 years. Methods We conducted a longitudinal study using linked administrative health databases in British Columbia, Canada including a provincial cancer registry, inpatient/outpatient visits, and vital statistics from January 1, 1986 to December 31, 2016. We calculated incidence rates per 100,000 at every age from 20 to 60 years and estimated annual percent change in incidence (APCi) of yCRC using joinpoint regression analysis. Results We identified 3,614 individuals with yCRC (49.9% women). The incidence of CRC steadily rose from 20 to 60 years, with a marked increase from 49 to 50 years (incidence rate ratio = 1.19; 95% confidence interval [CI] = 1.04 to 1.34). Furthermore, there was a trend of increased incidence of yCRC among women (APCi = 0.79%; 95% CI = 0.22% to 1.36%) and men (APCi = 2.17%; 95% CI = 1.59% to 2.76%). Analyses stratified by age yielded APCi's of 2.49% (95% CI = 1.36% to 3.63%) and 0.12% (95% CI = -0.54% to 0.79%) for women aged 30-39 years and 40-49 years, respectively and 2.97% (95% CI = 1.65% to 4.31%) and 1.86% (95% CI = 1.19% to 2.53%) for men. Conclusion Our findings indicate a steady increase over one-year age increments in the risk of yCRC during the years approaching and beyond screening age. These findings highlight the need to raise awareness as well as continue discussions regarding considerations of lowering the screening age.