FDA Issues Complete Response on Subcutaneous Saphnelo
FDA has issued AstraZeneca a complete response letter declining to approve its BLA for a subcutaneous formulation of Saphnelo (anifrolumab) for treating adult patients with systemic lupus erythematosus (SLE). AstraZeneca says it has submitted the additional information requested by FDA and is continuing to work with the agency to advance the application. The company expects a regulatory decision on the updated submission in the first half of 2026. The intravenously administered version of Saphnelo remains approved and commercially available in the U.S., it says.
The original BLA for subcutaneous Saphnelo was supported by a planned interim analysis of the Phase 3 TULIP-SC trial, which met its primary endpoint. According to the company, the safety profile of subcutaneous anifrolumab was consistent with that of the approved intravenous formulation.
Since the initial U.S. submission, AstraZeneca says it has reported additional data from the completed TULIP-SC trial. Full trial results showed that subcutaneous Saphnelo met the primary endpoint of reducing disease activity, as measured by the British Isles Lupus Assessment Group–based Composite Lupus Assessment at Week 52, it notes. Those findings were published in Arthritis & Rheumatology in January 2026.
If approved, the subcutaneous formulation would offer an alternative route of administration for patients with SLE, a chronic autoimmune disease that affects an estimated 3.4 million people worldwide and is associated with significant morbidity and long-term organ damage.