Otsuka Pharmaceutical Development & Commercialization Inc. filed its BLA with the U.S. FDA for sibeprenlimab to treat immunoglobulin A nephropathy (IgAN). The company’s first BLA, sibeprenlimab is a monoclonal antibody (MAb) that selectively inhibits the activity of APRIL (A PRoliferation-Inducing Ligand) in adults with IgAN.