The Anifrolumab PRIM Program

Anifrolumab is a human monoclonal antibody that binds to subunit 1 of the type 1 interferon receptor,which was developed based on the evidence supporting the role of type 1 interferon pathway in SLE. Clinical trial evidence from TULIP 1 and TULIP 2 have showed that monthly intravenous administration of anifrolumab led to a higher percentage of patients with a response, assessed with the British Isles Lupus Assessment Group-based Composite Lupus Assessment, compared with patients receiving placebo. Moreover, the phase II MUSE study showed that administration of anifrolumab resulted in substantially reduce disease activity, as measured by the SLE Responder Index,compared to patients receiving placebo. Anifrolumab was approved by the FDA and EMA in July 2021 and February 2022,respectively, for the treatment of adult patients with moderate to severe SLE who are receiving standard therapy.