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Duchenne muscular dystrophy (DMD) is a progressive genetic disease leading to muscular weakness. DMD is caused by mutations of the dystrophin gene on the X chromosome that is responsible for production of dystrophin protein. Dystrophin contributes to structural support in muscle cells and mutations result in dystrophin protein deficiency which causes muscle damage and the associated clinical presentation. Exon skipping medications, including the exon 53 targeting viltolarsen, are the first agents with the ability to partially restore dystrophin protein. Herein, the authors profile viltolarsen for the DMD patients who are amenable to exon 53 skipping therapy and provide their expert perspectives on this subject. Current findings suggest that viltolarsen could play a role in the current and possible future treatment of DMD. Viltolarsen seems to be safe and restores dystrophin protein to around 6% of the normal level. Due to orphan drug status, after the completion of the phase 2 clinical trial, viltolarsen was granted accelerated approval in Japan and in the US. A phase 3 trial is currently in progress and needs to earn full approval. Although a multidisciplinary approach continues to be critical, the addition of exon skipping agents like viltolarsen may improve the quality of patients’ lives. However, data on the long-term safety and efficacy of this medication are not yet available due to its recent accelerated approval.

Viltolarsen: a treatment option for Duchenne muscular dystrophy patients who are amenable to exon 53 skipping therapy