Tocilizumab in refractory Takayasu arteritis: a case series and updated literature review

The aim of this study is to analyze the efficacy and tolerance of tocilizumab in patients with Takayasu arteritis (TA).

We retrospectively studied patients with TA (ACR and/or Ishikawa's criteria): 5 French multicenter cases and 39 from the literature. Clinical, biological, radiological disease activity and treatment were analyzed before tocilizumab, during the follow-up and at the last available visit.

Forty-four patients (median age 26years [3-65];) were included in the present study: 5 patients from the 3 French university hospitals and 39 cases from the literature review. Median follow-up after initiation of tocilizumab was 15months [8-33]. Clinical and biological activities significantly decreased within 3months, similarly to steroid amount (from 15mg/day [5-75] at baseline to 10mg/day [2-30] at 6months; p<0.05) and steroid-dependence rate. Even radiological activity did not significantly decrease at 6months, significant decrease of arterial FDG uptake was noted at 6months. Median duration of tocilizumab treatment was 9months [3-180]. At the last visit, tocilizumab was continued in 17/32 patients (53%), and was discontinued in the 15 remaining cases because of the remission (n=5), relapse (n=3), persistent radiological activity (n=3), cutaneous rash (n=2), severe infection (n=1) and lacking of care welfare system (n=1). No death related to tocilizumab treatment was noted.

This study show the efficacy of tocilizumab in terms of clinical, biological and radiological response, as well as steroid-sparing agent. Only well-designed studies could definitely address the efficacy of tocilizumab in TA.