Thématique :
Originalité :
Solidité :
Très solide
Doit faire évoluer notre pratique :
Dans certains cas
Nom du veilleur :
Docteur Stéphane NAHON
Coup de coeur :
Clinical Gastroenterology and Hepatology
  2018 May;16(5):697-705.e7.  
  doi: 10.1016/j.cgh.2017.11.050.  
  Association of Vedolizumab Level, Anti-Drug Antibodies, and α4β7 Occupancy With Response in Patients With Inflammatory Bowel Disease  
  Ungar B, Kopylov U, Yavzori M, Fudim E, Picard O, Lahat A, Coscas D, Waterman M, Haj-Natour O, Orbach-Zingboim N, Mao R, Chen M, Chowers Y, Eliakim R, Ben-Horin S  



There are few data available on the real-life pharmacokinetic and pharmacodynamics features of vedolizumab, a monoclonal antibody against integrin α4β7. We performed a prospective study of patients with inflammatory bowel diseases (IBDs) treated with vedolizumab to determine serum drug concentrations, formation of antivedolizumab antibodies (AVAs), and integrin α4β7 saturation.


We performed a prospective study of 106 patients with IBD (67 with Crohn's disease and 39 with ulcerative colitis) treated with vedolizumab from September 2014 through March 2017 at 2 tertiary medical centers in Israel. Clinical data and serum samples were collected before and during induction and maintenance therapy. Clinical remission was defined as Harvey-Bradshaw index scores below 5 or as Simple Clinical Colitis Activity Index scores of 3 or less. We measured serum levels of vedolizumab, AVAs, and markers of inflammation. Peripheral blood mononuclear cells were obtained from some patients at designated trough time points and CD3+ CD45RO+ T cells were isolated from 36 samples. Cells were incubated with fluorescent-conjugated vedolizumab and flow cytometry was used to quantify α4β7 integrin saturation. We also performed flow cytometry analyses of CD3+ CD45RO+ lamina propria T cells isolated from intestinal mucosa of patients without IBD (non-IBD controls, n = 6), patients with IBD not treated with vedolizumab (untreated IBD controls, n = 8), and patients with IBD treated with vedolizumab (n = 15).


Clinical remission was achieved by 48 of 106 patients (45%) by week 6 and 50 of 106 patients (48%) by week 14 of treatment. The median level of vedolizumab at week 6 was higher in patients in clinical remission (40.2 μg/mL) than in patients with active disease (29.7 μg/mL; P = .05). The median serum level of vedolizumab was significantly higher in patients with a normal level of C-reactive protein (21.8 μg/mL vedolizumab) vs the level in those with a high level of C-reactive protein (11.9 μg/mL vedolizumab) during maintenance treatment (P = .0006). The other clinical outcomes measured were not associated with median serum level of vedolizumab at any time point examined. AVAs were detected in 17% of patients during induction therapy and 3% of patients during maintenance therapy, but did not correlate with clinical outcomes. Flow-cytometry analysis of peripheral blood memory T cells (n = 36) showed near-complete occupancy of α4β7 integrin at weeks 2 and 14 and during the maintenance phase, regardless of response status or drug levels. Most intestinal CD3+CD45RO+ memory T cells of healthy and IBD controls expressed α4β7 (72%; interquartile range, 56%-81%). In contrast, free α4β7 was detectable on only 5.6% of intestinal memory cells (interquartile range, 4.4%-11.2%) (P < .0001) from vedolizumab-treated patients, regardless of response.


In a prospective study of real-life patients with IBD, we associated vedolizumab drug levels with remission and inflammatory marker level. Integrin α4β7 was blocked in almost all T cells from patients treated with vedolizumab, regardless of serum level of the drug or response to treatment. These findings indicate a need to explore alternative mechanisms that prevent response to vedolizumab.

Question posée
Existe-t-il une corrélation entre l’activité de la MICI et le dosage du vedolizumab, des Ac anti-védo et de la saturation des récepteurs α4β7 des lymphocytes T du patient ?
Question posée
Oui, ce travail dans la vraie vie confirme la corrélation entre les dosages du védolizumab et l’activité de la MICI. La présence d’anticorps n’avait pas d’impact sur la réponse clinique.

L’intérêt du dosage des taux résiduels de védolizumab est confirmé par ce travail.