Alexion Pharmaceuticals, Inc. (ALXN) today announced that the European Commission (EC) has approved the extension of the current marketing authorization of SOLIRIS® (eculizumab) to include the treatment of neuromyelitis optica spectrum disorder (NMOSD) in adult patients who are anti-aquaporin-4 (AQP4) antibody-positive with a relapsing course of the disease. Nearly all patients treated with SOLIRIS were relapse free in the Phase 3 study, demonstrating the potential of SOLIRIS to change the treatment paradigm for this devastating disease,” said John Orloff, M.D., Executive Vice President and Head of Research and Development at Alexion.