Abstract
Viltolarsen (Viltepso® in Japan) is a phosphorodiamidate morpholino antisense oligonucleotide being developed by Nippon Shinyaku, in collaboration with the National Center of Neurology and Psychiatry (NCNP), for the treatment of Duchenne muscular dystrophy (DMD). Viltolarsen binds to exon 53 of the dystrophin mRNA precursor and restores the amino acid open-reading frame by skipping exon 53, resulting in the production of a shortened dystrophin protein that contains essential functional portions. In March 2020, intravenous viltolarsen received its first global approval in Japan for the treatment of DMD in patients with confirmed deletion of the dystrophin gene that is amenable to exon 53 skipping. Viltolarsen is under regulatory review in the USA and clinical trials continue in the USA, Canada and globally. This article summarizes the milestones in the development of viltolarsen leading to the first approval for DMD.
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