Seo M, et al. - Using the data of the derivation and validation cohorts, researchers examined the incidence and risk factors of delayed bleeding after colorectal endoscopic submucosal dissection (ESD) and developed a risk-scoring model for predicting delayed bleeding. The cohorts included 1189 patients from one center and 415 patients from the other four centers. In the derivation cohort, delayed bleeding occurred in 34 patients. Findings suggested that the risk-scoring model including tumor location, tumor size, and use of antiplatelet agents can quantitatively anticipate the risk of delayed bleeding after colorectal ESD. The incidence of delayed bleeding increased in the validation cohort as the score based on this system increased.