Biogen Inc. is one of the world's leading biotechnology companies which focuses on developing innovative therapies for treating serious neurological and neurodegenerative diseases, including its core growth areas of multiple sclerosis (MS) and neuroimmunology, Alzheimer's disease (AD) and dementia, movement disorders including Parkinson's disease, neuromuscular disorders, including spinal muscular atrophy (SMA) and amyotrophic lateral sclerosis (ALS) and ophthalmology. Key multiple sclerosis/MS drugs in its portfolio are Tecfidera, Vumerity, Avonex, Plegridy, Fampyra and Tysabri. Other approved/marketed products include Fumaderm (severe psoriasis), Spinraza (spinal muscular atrophy (SMA)) and Aduhelm (Alzheimer's disease).