Welcome to the website of the Dutch T1 Colorectal Cancer (CRC) Working Group The Dutch T1 CRC Working group Group is a collaboration between gastroenterologists, surgeons and pathologists. With this multidisciplinary multicenter collaboration we aim to perform high-quality research concerning the detection, diagnosis, treatment and surveillance of T1 CRC in order to increase common knowledge and awareness and decrease the number patients that will be referred for surgery without any benefit. ​ Please feel free to contact us if you have any questions regarding the working group, want to participate in our working group or want to collaborate in future trials.