Background and Aim The aim of this investigation was to evaluate the efficacy of Japanese magnifying colonoscopic classifications for ulcerative colitis‐associated neoplasia (UCAN). Methods We reviewed the colonoscopy records from 2011 to 2018 at our institutions and identified cases of endoscopically or surgically resected UCAN observed by magnifying narrow‐band imaging (NBI) endoscopy and magnifying chromoendoscopy. Association between magnifying endoscopic classification and histopathological findings was investigated retrospectively. Japan NBI expert team (JNET) classification and pit pattern classification were applied. Results There were 17 patients who had a diagnosis of UCAN. Tumors of types 2A, 2B and 3 by JNET classification correlated with the histopathological findings of low‐grade dysplasia (LGD)/high‐grade dysplasia (HGD), HGD, and massively submucosal invasive (mSM) carcinoma, respectively. Tumors of types III/IV, VI low irregularity, and VI high irregularity/VN by pit pattern classification were correlated with the histopathological findings of LGD/HGD, HGD, and mSM carcinoma, respectively. Conclusions Japan NBI expert team classification and pit pattern classification may be predictive of the histological diagnosis and invasion depth of UCAN. This needs to be investigated prospectively in a large cohort or in a randomized clinical trial.

In the present retrospective cohort study, approximately half of patients with internal fistulas avoided surgery for long periods. It may be reasonable to treat quiescent single internal fistulas with anti-TNF agents soon after the diagnosis of internal fistulas.

Tac and IFX may be equally efficacious for the induction and maintenance of remission in patients with UC while minor adverse events are more frequent with the former treatment.

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The CYP2C19 genotype might be associated with the risk of small bowel injury when celecoxib is combined with rabeprazole.