AbstractObjectiveTherapeutic efficacy of biologics has remained at about 50% for 2 decades. In Crohn’s disease (CD) patients, we examined the predictive value of an epithelial cell biomarker, ileal microvillar length (MVL), for clinical response to ustekinumab (UST) and vedolizumab (VDZ), and its relationship to another biomarker, intestinal epithelial cell (IEC) pyroptosis with respect to response to VDZ.DesignIleal biopsies from the UNITI-2 randomized controlled trial were analyzed for MVL as a predictor of clinical response to UST. In a 5-center academic retrospective cohort of CD patients, ileal MVL was analyzed to determine its predictive value for response to VDZ. Correlation between ileal MVL and IEC pyroptosis was determined, and the discriminant ability of the combination of two biomarkers to VDZ was examined.ResultsClinical response in UST was significantly higher than placebo (65% vs. 39%, p=0.03), with patients with normal MVL (>1.7 µm) having the greatest therapeutic effect: 85% vs. 20% (p=0.02). For VDZ, clinical response with MVL of 1.35-1.55 µm was 82% vs. 44% (<1.35 µm) and 40% (>1.55 µm) (p=0.038). There was no correlation between ileal MVL and IEC pyroptosis. The combination criteria of ileal pyroptosis < 14 positive cells/1000 IECs or MVL of 1.35-1.55 µm could identify 84% of responders and 67% of non-responders (p=0.001).ConclusionsIleal MVL was predictive of response to UST and VDZ in prospective and retrospective CD cohorts. It was independent of ileal IEC pyroptosis, combination of the two biomarkers enhanced the discriminate ability of responders from non-responders to VDZ.
P501 Baseline characteristics of Crohn's disease patients in the vedolizumab PASS study: a cohort study assessing the safety and effectiveness of vedolizumab compared to other biologic agents (02)