Anorectal Cancer in Crohn's Disease Has a Poor Prognosis Due to its Advanced Stage and Aggressive Histological Features: a Systematic Literature Review of Japanese Patients.

CD-associated anorectal carcinoma had a poor prognosis due to the advanced stage of the cases and aggressive histological features. As earlier-stage cancer is associated with a better prognosis than advanced stage disease, and it is also typically diagnosed by colonoscopy, surveillance colonoscopy may therefore help to improve the prognosis in cases without any symptomatic changes.