Changes of Crohn's disease phenotype over time

Area of Science:

• Gastroenterology
• Inflammatory Bowel Disease Research
• Clinical Phenotyping

Background:

• Crohn's disease (CD) is a complex inflammatory bowel disease with variable clinical presentations.
• Understanding CD phenotype evolution is crucial for predicting disease course and treatment needs.
• The Montreal Classification provides a standardized framework for CD phenotyping.

Purpose of the Study:

• To analyze the longitudinal changes in Crohn's disease phenotype using the Montreal Classification.
• To identify predictors of disease progression towards stricturing or penetrating complications.
• To determine factors associated with the requirement for immunosuppressive therapy or surgical intervention.

Main Methods:

• A cohort of 120 Crohn's disease patients with at least 5 years of follow-up was analyzed.
• Patients' phenotypes at diagnosis and after 5 years were assessed according to the Montreal Classification.
• Statistical analysis identified predictive factors for disease severity and treatment escalation.

Main Results:

• Disease location remained stable in 93.4% of patients over 5 years.
• The incidence of stricturing (B2) and penetrating (B3) phenotypes increased from 6% to 11%.
• Small bowel involvement (L1), stricturing/penetrating phenotypes, and perineal lesions were significant predictors of disease severity and treatment escalation.

Conclusions:

• Crohn's disease phenotype can evolve, with inflammatory patterns progressing to more aggressive stricturing and penetrating forms.
• Ileal location, stricturing/penetrating phenotypes, and perineal lesions are key indicators for predicting the need for surgery and immunosuppressive/immunomodulatory treatments.
• Early identification of these predictive factors can guide proactive management strategies in Crohn's disease.