In a comprehensive review of SEER (Surveillance, Epidemiology, and End Results) 18 data researchers analyzed histologic colorectal subtypes independently and found that some lesions categorized as colorectal cancer may potentially be lower-risk tumors. The findings are published in Annals of Internal Medicine.
Data indicate that adenocarcinomas are increasing in most early-onset subgroups, but that carcinoids, a distinct type of tumor, are increasing at a faster rate, at least in part because of increased detection and case capture by cancer registries.
Source:https://medicalxpress.com/news/2020-12-comprehensive-early-onset-colorectal-seer-specifically.html