Peripheral Blood Inflammatory Markers and Crohn’s Disease: Lymphocytes Counts Could Predict Stricture Lesions 

Background: Intestinal stricture is a complication of Crohn’s disease (CD) due to fibrosis, but there are no biomarkers for predicting intestinal strictures before clinical obstruction. It is reported that several types of lymphocytes (LC) are involved in the pathogenesis of intestinal fibrosis. However, few studies have focused on the peripheral blood LC in patients with CD associated stricture. Aim: ： To analyze the relationships between peripheral blood inflammatory markers especially LC and CD to provide evidence for CD diagnosis and therapy. Methods: : A total of 158 CD patients who underwent single-balloon enteroscopy from January 2016 to June 2019 in Jinling Hospital were retrospectively enrolled. The Montreal classification, maintenance medicines, CD activity index (CDAI), simple endoscopic score for CD (SES-CD), full blood count and C-reactive protein (CRP) level were recorded. The relationships among peripheral blood inflammatory markers, disease activity and intestinal strictures were analyzed using SPSS 22.0. Results: : After excluding 8 patients treated with azathioprine, which severely affects blood counts, 150 patients were divided into two groups: a stricture group (n=82) and non-stricture group (n=68). LC and the proportion of lymphocytes (LC%) were significantly lower in the stricture group than in the non-stricture group, p was 0.000 and 0.018, respectively, and LC was an independent risk factor of stricture lesion. In the subgroup analysis, 30 strictures without obstruction were classified as mild strictures, and 52 cases of obstruction were in the severe stricture group. LC notably decreased following stricture aggravation, p=0.000. The area under the curve (AUC) of LC predicting strictures was 0.711 with sensitivity of 73.5% and a specificity of 63.4% (cutoff: 1.245). Conclusion: LC gradually decreases as intestinal strictures aggravated and could be a new marker for predicting intestinal strictures in CD patients.