Zenas BioPharma Secures $300M Royalty Deal for Obexelimab FDA Approvals on September 02, 2025 Approved Autoimmune Diseases IgG4-Related Disease Lupus Erythematosus, Systemic Obexelimab Phase 3 INDIGO trial royalty Royalty Pharma United States Food and Drug Administration Zenas BioPharma +