From zero disease-specific drugs to five in three years: how endothelin, complement and APRIL inhibitors are redrawing the IgAN market.
US IgA nephropathy has shifted from RAS-blockade supportive care to five disease-modifying therapies. This maps the epidemiology and the biopsy-and-proteinuria diagnostic gate that still controls who reaches them.
US payers gate the five FDA-approved IgAN therapies on biopsy, proteinuria and RAS-blockade step-through. The Filspari REMS, Part D routing and the ICER 2026 assessment set the rest of the access path.