Background: Terminal ileum inflammation and surgical resections impair absorption of vitamin B12 and D in patients with Crohn’s disease (CD) and Ulcerative Colitis (UC). We assessed differences in subclinical deficiencies of vitamin B12 (<350 pg/mL) or D (<50 nmol/L), by lesion localization (namely non-ileal CD, ileal CD, and UC) and surgical resection status (namely no resection, non-ileal small bowel resections, ileocecal resections, and colonic resections) in CD and UC patients. Methods: We analyzed data from 571 patients (17–93 years), with UC (51%) and CD (49%, including 47 non-ileal (8%), 244 ileal-CD (46%)) managed at the University of Missouri Health Care System (Jan 2017–April 2022). Results: Prevalence of vitamin B12 and vitamin D deficiencies was 19% and 83%, respectively. Prevalence of resection was 26%, including 5% with non-ileal small bowel resections, 11% with ileocecal resections, and 10% with colonic resections. CD with ileal involvement was associated with a 3-fold elevated risk of B12 deficiency (p = 0.004), but not vitamin D. Ileocecal resections were associated with a >3-fold increase in both B12 deficiency (OR = 3.53, p = 0.001) and D deficiency (OR = 3.35, p = 0.044). Conclusions: CD patients with ileal involvement and ileocecal resections have an elevated risk of vitamin B12 and D deficiency, and may benefit from adjunctive supplementation.

Introduction: Patients with inflammatory bowel disease (IBD) have an increased risk of Clostridioides difficile infection (CDI). While antibiotic exposure has been considered the most prominent risk factor for CDI, proton pump inhibitor (PPI) use is another potential risk factor. Methods: From January 2017 to April 2021, we examined the University of Missouri’s IBD patients’ medical records. Laboratory-confirmed CDI diagnosis was the main outcome of interest. The usage of PPIs was the exposure of interest. The odds ratio between CDI risk in PPI users and non-users was estimated using logistic regression models. We investigated CDI risk with PPI use duration using stratified analysis. Results: Overall prevalence of CDI was 9%. 358 patients (42%) reported using PPI, with an average duration of ~30 months, with a range of 0.1 to 255. PPI use was associated with a higher risk of CDI in both the unadjusted (OR = 1.58 [0.98–2.53]; p = 0.06) and adjusted models (9.23 [2.11–40.34]; p = 0.003). Only those who used PPIs for less than 30 months had a greater risk of CDI in the stratified analysis (OR = 2.10 [1.16–3.38], p = 0.014). Long-term use (≥30 months) did not increase the incidence of CDI (OR = 0.74 [0.29, 1.83]; p = 0.510). Discussion: This is the single largest study of the US general IBD population to evaluate the association between PPI use and risk of developing CDI. PPI therapy was linked to a significant elevation in CDI risk, restricted to PPI use for up to 30 months. Histamine-2 receptor antagonists (H2RAs) did not increase the risk of CDI.

Background: Over 30% of patients with inflammatory bowel disease (IBD) experience primary non-response to tumor necrosis factor-α antagonists (anti-TNFs). Oncostatin M (OSM), a TNF-α-independent pro-inflammatory signaling cytokine, is emerging as a potential predictive biomarker of treatment response. Through a systematic review and meta-analysis, we assessed the utility of baseline serum or plasma OSM for predicting anti-TNF response in IBD patients. Methods: We searched PubMed, Embase, Cochrane Library, and Web of Science through March 2026 for studies reporting associations between baseline serum/plasma OSM and endoscopic or clinical response to anti-TNF therapy in adult IBD patients. We used a bivariate random-effects model to estimate pooled sensitivity, specificity, diagnostic odds ratio (DOR), and area under the receiver operating characteristic (ROC) curve (AUC). Quality was assessed using QUADAS-2. Results: Data from four studies (n = 441 patients) were pooled. We estimated a pooled sensitivity of 82.8% (95% CI 71.4–90.3%) and a specificity of 88.4% (95% CI 82.7–92.4%) for predicting anti-TNF non-response. The pooled AUC was 0.899 (95% CI 0.858–0.940), with low heterogeneity (I² = 16.0%). The pooled DOR was 36.7 (95% CI 15.7–85.8), with a positive likelihood ratio of 7.1 and a negative likelihood ratio of 0.19. Risk of bias was low across the studies. Conclusions: Higher serum OSM was associated with treatment failure in IBD patients receiving anti-TNF therapy, with a pooled AUC of 0.899 in assay-stratified analysis and 0.820 when all studies were included. However, the small number of available studies, substantial variability in OSM cutoffs (14–233.6 pg/mL) and assay heterogeneity limit the robustness and generalizability and call for additional prospective data to more-robustly characterize the clinical utility of OSM.