K Chen et al. Inflamm Bowel Dis 2023; 29: 1499-1503. Serum Ustekinumab Concentrations Are Associated With Improved Outcomes With the Magnetic Resonance Index of Activity for Crohn’s Disease
This retrospective trial included thirty three patients with Crohn’s disease (CD) receiving maintenance ustekinumab (UST). The simplified Magnetic Resonance Index of Activity (sMARIA) and biomarkers were correlated with UST levels. The authors utilized a homologous mobility shift assay (HMSA) (Prometheus) for their UST levels.
Key findings:

Both findings were clinically-significant P=.01

My take: This study show the need for higher levels of UST to achieve optimal outcomes. Levels of at least 8.4 appear to be a good target.
Related blog posts:
- Head-to-Head (Sort of): Infliximab vs Ustekinumab for Crohn’s Disease
- Dose Escalation of Ustekinumab & Support Tool “Should I Have IBD Surgery?”
- Can You Give Ustekinumab Subcutaneously After IV Reaction?
- Ustekinumab Escalation in Patients with Crohn’s Disease & Healthy Lifestyle Choices for IBD Patients
- CCFA 2023 (Atlanta) -Part 1
- CCFA 2023 (Atlanta) Part 4
- Therapeutic Drug Monitoring: Ustekinumab (Stelara) (In 2017, this study suggested a level of at least 4.5)
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