Dr. David Tate presents a study on the impact of incomplete mucosal layer excision during endoscopic mucosal resection (EMR). The study reveals a 2.0% prevalence of incomplete excision in donated colorectal polyps. It identifies residual lamina propria and muscularis mucosa as potential markers for recurrence. The findings highlight the need for improved EMR techniques and further research on higher recurrence rates after thermal ablation.