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Published on: February 14, 2021
Real-life evaluation of histologic scores for Ulcerative Colitis in remission
Christian Børde Arkteg1, Sveinung Wergeland Sørbye2, Lene Buhl Riis3,4
1Research Group Gastroenterology Nutrition, Institute of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, Norway.
Background:
Histological evaluation of ulcerative colitis (UC) patients has been debated ever since the first description of the disease and its role in follow-up has never been fully established. Recent evidence suggests an added benefit in accuracy when evaluating if the patient is in remission. Unfortunately, there are several different histological indices, and it is difficult to compare outcomes where different scores are applied. Histopathological evaluation is prone to subjective biases, despite the use of indices. In addition, these indices are developed by expert IBD pathologist, but applied at large, by general pathologist. Therefore, we evaluated the three most applied histological indices for UC on samples from patients in remission to compare test qualities and estimate their usefulness to identify remission by both general and GI specialized pathologist.
Method:
Mucosal biopsies from 41 UC patients in clinical and endoscopic remission were collected as part of a larger study on UC. Three pathologists blinded to the patients' clinical status evaluated them using Geboes score (GS), Nancy Index (NI) and Robarts Histopathological Index (RHI). We calculated the agreement between the pathologists using Inter-class correlation (ICC) and visualized it with ICC-plots and Bland-Altman plots. Association between clinical factors and histological category were analysed by Fisher's exact test.
Results:
The ICC value for GS, RHI and NI were 0.85, 0.73 and 0.70 respectively. The limits of agreement were ±6.1, ±4.0 and ±1.4, for GS, RHI and NI, respectively. Mayo endoscopic subgrade and UC clinical score did not show association with any histological scores. Despite clinical and endoscopic remission 7-35% of the patients displayed histological inflammation on a level classified as active disease, depending on the index and cut-off.
Conclusion:
A substantial amount of UC patients in clinical and endoscopic remission display inflammation on a histological level, but the ability to classify these patients accurately and consistently could be improved.
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