Anifrolumab in systemic lupus erythematosus

Systemic lupus erythematosus is a complex autoimmune disease with variable disease presentation and progression. Hydroxychloroquine and corticosteroids are first-line therapies. Disease severity and organ system involvement guide escalation of immunomodulatory medications beyond these mainstays. Anifrolumab is a first-in-class global type 1 interferon inhibitor recently approved by the United States Food and Drug Administration (FDA) for systemic lupus erythematosus in addition to standard of care. This article reviews the role of type 1 interferons in lupus pathophysiology and the evidence leading to anifrolumab's approval with particular emphasis on the MUSE, TULIP-1 and TULIP-2 trials. In addition to standard of care, anifrolumab can reduce corticosteroid requirements and reduce lupus disease activity, especially skin and musculoskeletal manifestations, with an acceptable safety profile.