Evidence suggests that incidence of colorectal cancer (CRC) is increasing among adults younger than 50 years in the United States.1 The underlying causes of the increased incidence are unclear. If the increase is the result of earlier detection due to increased use of colonoscopy, earlier stage at diagnosis would be expected, whereas if the increased incidence is the result of true increases in risk, relatively later stage at diagnosis would be expected. We investigated trends in CRC incidence by stage in adults younger than 50 years. We focused our study on adults aged 40 through 49 years, who account for almost 3 of 4 young-onset cases.
Meester RGS, Mannalithara A, Lansdorp-Vogelaar I, Ladabaum U. Trends in Incidence and Stage at Diagnosis of Colorectal Cancer in Adults Aged 40 Through 49 Years, 1975-2015. JAMA. 2019;321(19):1933–1934. doi:10.1001/jama.2019.3076
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