The study aims to develop a CLE composite scoring system of CD healing according to enterocyte regeneration compared against a similar histopathological method of assessment. Methods: Subjects underwent eCLE (Pentax, Japan) for the evaluation of treated or untreated CD. A composite CLE Regeneration Score (CRS) was developed based on enterocyte and goblet cell features (Table 1). The summative score of 5 duodenal sites each scored between 0 and 3 represented CD severity (CRS range: 0–15). An equivalent H&E histological severity

score (HiS) of CD was developed as gold standard with blinded assessment by a GI histopathologist.

Chi-square and Mann-Whitney U scores Obeticholic Acid mouse were used for categorical and continuous variables. Spearman’s correlation was used for correlation of CLE with histology as primary endpoint. Kappa (k) interobserver agreement was performed. Efficacy of the grading systems was defined by receiver operator characteristics (ROC) >0.9. Results: 17 patients (12 females, median age 41 years old, age range 14–38) yielded 800 CLE optical biopsies paired see more with 80 forceps biopsies for analysis. Sex and age were not different between treated and untreated CD patients (P > 0.05). Treated patients had their CLE after a mean of 362 days (range: 147–427) of GFD. Using a cut off of ‘1’ showed the ROC area under the curve of 0.94 (95% CI: 0.83–1.00) for CLE and 0.94 (95% CI: 0.82–1.00) for histopathology. CLE detected all abnormal histology in all patients (P < 0.002). Casein kinase 1 The median CRS for untreated and treated patients were 2.5 (IQR 2-3) and 0 (IQR 0-1) respectively. CS correlated with duration of the GFD (r = 0.917,

P = 0.001). Sensitivity, specificity, PPV and NPV for CLE using this cut off in detecting enterocyte regeneration were: 85%, 100%, 79% and 100% respectively. The k values of 2 CLE endoscopists for the agreement of mild, moderate, and severe CLE features were 0.67, 0.75, and 0.84 respectively. CRS grading correlated excellently and significantly with HiS histological severity grading (r = 0.832, P < 0.001). Conclusion: Confocal laser endomicroscopy accurately detects in vivo enterocyte and goblet cellular regeneration representative of coeliac disease treatment response equivalent to histopathology. CLE may provide instantaneous reporting of GFD efficacy and avoid the cost, delay and risks of forceps biopsies. Table 1: Classification Criteria for CLE and Histology. CS: CLE-Score; HiS: Histology Score.