An international multicenter real-life prospective study of electronic chromoendoscopy score PICaSSO in ulcerative colitis
Research output: Contribution to journal › Article › peer-review
Colleges, School and Institutes
Background & Aims
Endoscopic and histologic remission are important goals in the treatment of ulcerative colitis (UC). We investigated the correlation of the recently developed Paddington International Virtual ChromoendoScopy ScOre (PICaSSO) and other established endoscopic scores against multiple histological indices and prospectively assessed outcomes.
In this prospective multicenter international study, inflammatory activity was assessed with high-definition and virtual chromoendoscopy in the rectum and sigmoid using the Mayo Endoscopic Score (MES), UC Endoscopic Index of Severity (UCEIS), and PICaSSO. Targeted biopsies were taken for assessment using Robarts Histological Index (RHI), Nancy Histological index (NHI), ECAP (Extent, Chronicity, Activity, Plus score), Geboes, and Villanacci. Follow-up data were obtained at 6 and 12 months after colonoscopy.
A total of 307 patients were recruited. There was strong correlation between PICaSSO and histology scores, significantly superior to correlation coefficients of MES and UCEIS with histology scores. A PICaSSO score of ≤3 detected histologic remission by RHI (≤3 + absence of neutrophils) with area under the receiver operating characteristic curve (AUROC) 0.90 (95% confidence interval [CI] 0.86–0.94) and NHI (≤1) AUROC 0.82 (95% CI 0.77–0.87). The interobserver agreement for PICaSSO was 0.88 (95% CI 0.83–0.92). At 6- and 12-months follow-up, PICaSSO score ≤3 predicted better outcomes than PICaSSO >3 (hazard ratio [HR] 0.19 [0.11–0.33] and 0.22 [0.13–0.34], respectively),} as well as PICaSSO 4–8 (HR 0.25 [0.12–0.53] and 0.22 (0.12–0.39), respectively) and similar to histologic remission.
In this first real-life multicenter study, the PICaSSO score correlated strongly with multiple histological indices. Furthermore, PICaSSO score predicted specified clinical outcomes at 6 and 12 months, similar to histology. Thus, PICaSSO can be a useful endoscopic tool in the therapeutic management of UC.
|Early online date||18 Dec 2020|
|Publication status||E-pub ahead of print - 18 Dec 2020|