Expression and function of α4β7 integrin predict the success of vedolizumab treatment in inflammatory bowel disease

Inflammatory bowel diseases are medically intractable and require constant therapy in many cases. While a growing number of biologicals and small molecules is available for treatment, a substantial portion of patients experiences primary non-response to these compounds and head-to-head evidence for therapy selection is scarce. Thus, approaches to predict treatment success in individual patients are a huge unmet need.We had previously suggested that the expression and function of alpha 4 beta 7 integrin on T cells in the peripheral blood correlate to outcomes of therapy with the anti-alpha 4 beta 7 integrin antibody vedolizumab. Here, we conducted a translational multicenter trial to prospectively evaluate this hypothesis.In a cohort of 89 patients with inflammatory bowel disease undergoing regular therapy with vedolizumab, lower baseline expression of alpha 4 beta 7 was associated with short-term clinical response. Consistently, low alpha 4 beta 7 expression in patients achieving remission predicted sustained remission in week 30. Moreover, high dynamic adhesion of CD4+ T cells to MAdCAM-1 and high reduction of adhesion by vedolizumab in vitro at baseline were associated with clinical remission.These data substantiate the potential of alpha 4 beta 7 integrin function and expression to forecast outcomes of vedolizumab therapy. Further translational efforts are necessary to improve the performance of the assays and to implement the concept in clinical practice.

Automated summary

Inflammatory bowel diseases require constant therapy, but many patients do not respond to available treatments. Previous research suggested that the expression and function of the alpha 4 beta 7 integrin on T cells correlate to outcomes of therapy with vedolizumab. This study further confirmed the potential of alpha 4 beta 7 integrin to predict the efficacy of vedolizumab therapy.