Abstract
Introduction
The aim of this study was to evaluate the association between serum ustekinumab (UST) trough levels and response to induction and maintenance UST treatment in refractory Crohn’s Disease (CD) patients.
Methods
We performed a prospective study including CD patients who received UST from September 2015 to January 2017. Patients received 90 mg of UST subcutaneously at weeks 0, 4, and 12, then every 8 weeks. Two cohorts of patients were analyzed: an induction cohort and a maintenance cohort. We evaluated clinical, biological, and imaging/endoscopic response to UST treatment. UST trough levels and anti-UST antibodies were dosed at weeks 12 and 28 in the induction cohort, and at a single time point in the maintenance cohort.
Results
Forty-nine patients were enrolled in the maintenance cohort. Mean concentrations of UST were 1.88 ± 1.40 µg/mL. UST trough levels were not significantly different in patients with or without clinical, biological, or imaging/endoscopic responses to UST treatment (p > 0.11). Twenty-three consecutive patients were included in the induction cohort. At week 12, mean UST concentrations were 1.45 ± 1.15 µg/mL. Patients with a biological response to UST treatment had significant higher serum UST trough concentration (median 1.72 µg/mL) than non-responders (median 0.56 µg/mL, p = 0.02). A UST trough level ≥ 1.10 µg/mL at week 12 was associated with a biological response to UST treatment at 6 months.
Conclusion
UST trough levels were associated with a biological response at the end of the induction phase. In patients with low levels of UST, optimization treatment may be necessary to obtain a sustained response.
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Abbreviations
- UST:
-
Ustekinumab
- CD:
-
Crohn’s disease
- IBD:
-
Inflammatory bowel disease
- TNF:
-
Tumor necrosis factor
- IFX:
-
Infliximab
- ADA:
-
Adalimumab
- HBI:
-
Harvey–Bradshaw index
- PGA:
-
Physician global assessment
- CRP:
-
C-reactive protein
- MRI:
-
Magnetic resonance imaging
- ELISA:
-
Enzyme-linked immunosorbent assay
- ROC:
-
Receiver operating characteristic
- IQR:
-
Interquartile range
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CP and BP conceived and designed the study, interpreted the data, drafted the manuscript, and supervised the study. CP, BP and ND gave administrative, technical, or material support. All authors took part in data acquisition, critical revision of the manuscript for important intellectual content, and approval of the final version.
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Supplementary Fig.
1: Serum UST trough levels at the end of the induction phase (week 12) in the induction cohort according to the clinical response to UST treatment. Boxplot of serum UST trough levels in patients with (left box) or without (right box) clinical response to UST therapy at week 12. The box represents the 25th–75th percentiles, and the whiskers correspond to the 5th–95th percentiles. W. Abbreviations: UST, ustekinumab (TIFF 48 kb)
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Painchart, C., Brabant, S., Duveau, N. et al. Ustekinumab Serum Trough Levels May Identify Suboptimal Responders to Ustekinumab in Crohn’s Disease. Dig Dis Sci 65, 1445–1452 (2020). https://doi.org/10.1007/s10620-019-05865-3
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DOI: https://doi.org/10.1007/s10620-019-05865-3