ArticleTechniques in coloproctology2025
Time to classify: a narrative and scoping review of the old and the new classifications of perianal Crohn's disease.
Article in Techniques in coloproctology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
3 citing papers in PubMed.
- High Complexity Anal Fistula in Perianal Fistula Crohn's Disease with Rectal Fistula.Digestive diseases and sciences · 2026Article
- Intraoperative Autologous Adipose-Derived Therapies and PRP as Add-On in the Surgical Treatment of Cryptoglandular and Crohn's Disease-Related Perianal Fistula-A Systematic Review.Bioengineering (Basel, Switzerland) · 2026Review
- Non-Fistulizing Perianal Disease in Crohn's Disease: Clinical Significance, Pathogenesis, and Management Strategies.Journal of clinical medicine · 2025Review
Corrections and comments
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Authors and funding
8 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Perianal Crohn's disease (pCD) is a complex manifestation of Crohn's disease. Classifying this patient cohort for both clinical purposes and for inclusion into research trials is challenging but crucial in order to improve outcomes. This review provides an overview of historical classifications of both fistulising and non-fistulising pCD, including the Park's, Cardiff-Hughes and American Gastroenterological Association (AGA) classifications, as well as recent advances including the Treatment Optimisation and CLASSification of perianal Crohn's disease (TOpClass) classification of fistulising pCD. Secondly, this article provides a scoping review of recent trials in pCD and describes how the cohorts in these trials relate to the TOpClass classification. Of the 19 studies relating to pCD that were identified, four could be confidently classified as class 2a. Seven could be classified as class 2a or 2b, but it was not possible to subdivide further, and seven to class 2a, 2b or 2c, but it was not possible to subdivide further. One study population was classified as class 2a or 2c. In eight studies, it was not specified whether patients with a defunctioning stoma were included or excluded. This review demonstrates the heterogeneous nature of some patient cohorts in previous clinical trials, and how the TOpClass classification may be used to group patients more accurately for clinical use and inclusion in research trials.
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