Fig. 2.

Treatment strategies and oncologic outcomes within the subgroup of 1268 endoscopically resected screen-detected and non-screen-detected T1 colorectal cancers (CRCs), subdivided according to histopathologic risk group. * High risk was defined as having one or more of the following histopathologic risk factors: lymphovascular invasion, poor differentiation, positive resection margin (R1) or non-assessable resection margin (Rx). In the absence of all of these risk factors, a T1 CRC was classified as low risk. When all known risk factors were absent, but one or more risk factors were missing, a T1 CRC was classified as being of undetermined risk.