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Published on: February 14, 2021
Validation of the 'Inflammatory Bowel Disease-Distribution, Chronicity, Activity [IBD-DCA] Score' for Ulcerative
Corinna Lang-Schwarz1, Miriam Angeloni2, Abbas Agaimy2
1Institute of Pathology, Klinikum Bayreuth GmbH, Bayreuth, Germany.
Insights
The new Inflammatory Bowel Disease [IBD]-Distribution, Chronicity, Activity [DCA] score offers a reliable method for assessing histological disease activity in ulcerative colitis and Crohn´s disease. This validated score aids in evaluating treatment response for IBD patients.
Area of Science:
- Gastroenterology
- Histopathology
- Inflammatory Bowel Disease research
Background:
- Histological scoring is crucial for assessing disease activity in ulcerative colitis [UC] and Crohn´s disease [CD].
- A unified histological scoring system for both UC and CD is currently lacking.
- The Inflammatory Bowel Disease [IBD]-Distribution [D], Chronicity [C], Activity [A] score [IBD-DCA score] was developed to address this need.
Purpose of the Study:
- To validate the IBD-DCA score for histological disease activity assessment in IBD.
- To evaluate the inter- and intra-rater reliability of the IBD-DCA score.
- To assess the construct validity and responsiveness to treatment of the IBD-DCA score.
Main Methods:
- 16 observers assessed biopsy specimens from 59 UC and 25 CD patients for inter- and intra-rater reliability.
- Construct validity and treatment responsiveness were evaluated retrospectively in a cohort of 30 patients.
- The IBD-DCA score was compared with existing indices like the Nancy Histological Index [NHI] and Simplified Geboes Score [SGS].
Main Results:
- Moderate to good inter-rater reliability was observed in the UC cohort, and moderate reliability in the CD cohort.
- Excellent intra-rater agreement was achieved in both UC and CD cohorts.
- The IBD-DCA score showed moderate to strong correlations with NHI, SGS, and Visual Analogue Scale [VAS], with large effect sizes and correlated changes indicating responsiveness to treatment.
Conclusions:
- The IBD-DCA score is a simple, validated histological activity score for both UC and CD.
- It demonstrates good reliability and responsiveness to treatment, supported by a consensus among IBD specialists.
- The IBD-DCA score holds potential for routine diagnostics and clinical studies in IBD management.
Background And Aims:
Histological scoring plays a key role in the assessment of disease activity in ulcerative colitis [UC] and is also important in Crohn´s disease [CD]. Currently, there is no common scoring available for UC and CD. We aimed to validate the Inflammatory Bowel Disease [IBD]-Distribution [D], Chronicity [C], Activity [A] score [IBD-DCA score] for histological disease activity assessment in IBD.
Methods:
Inter- and intra-rater reliability were assessed by 16 observers on biopsy specimens from 59 patients with UC and 25 patients with CD. Construct validity and responsiveness to treatment were retrospectively evaluated in a second cohort of 30 patients.
Results:
Inter-rater reliability was moderate to good for the UC cohort (intraclass correlation coefficients [ICCs] = 0.645, 0.623, 0.767 for D, C, and A, respectively) and at best moderate for the CD cohort [ICC = 0.690, 0.303, 0.733 for D, C, and A, respectively]. Intra-rater agreement ranged from good to excellent in both cohorts. Correlation with the Nancy Histological Index [NHI] was moderate and strong with the Simplified Geboes Score [SGS] and a Visual Analogue Scale [VAS], respectively. Large effect sizes were obtained for all three parameters. External responsiveness analysis revealed correlated changes between IBD-DCA score and NHI, SGS and VAS.
Conclusions:
The IBD-DCA score is a simple histological activity score for UC and CD, agreed and validated by a large group of IBD specialists. It provides reliable information on treatment response. Therefore, it has potential value for use in routine diagnostics as well as clinical studies.
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