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Although glucocorticoids (GC) remain the corner stone of giant cell arteritis (GCA) treatment, GC-sparing strategies are needed because GC are responsible for side effects.1 Recent advances in the pathophysiology of GCA showed that CD4+ T cells are recruited in the arterial wall and polarised into Th1 and Th17 cells,2 3 the latter being sensitive to GC-mediated suppression, whereas Th1 response persists in GC-treated patients,2 which triggers the recruitment of macrophages4 and could be implicated in the occurrence of relapses when GC are tapered. Interleukin (IL)-12 and IL-23 are two cytokines involved in Th1 and Th17 polarisations, respectively.5 These two cytokines share a common subunit (p40), which allows ustekinumab, a humanised anti-p40 monoclonal antibody, to target both IL-12 and IL-23 pathways, thus disrupting in theory Th1 and Th17 immune responses.6 Recently, an open-label study reported on the efficacy and safety of …
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