Rarecast

Drug development activities focused on the rare, neuromuscular condition Duchenne muscular dystrophy have translated into functional improvements and an extension of life expectancy. Regenxbio is among several companies pursuing a gene therapy to treat Duchenne. Regenxbio believes both its microdystrophin—a truncated form of the dystrophin gene­ small enough to fit in a vector­—and the vector it is using, give it a competitive advantage over other efforts. We spoke Curran Simpson, CEO of Regenxbio, about the company’s platform technology, the advantages he sees with its experimental DMD gene therapy, and how a partnership announced at the start of 2025 focused on a pair of other gene therapies provided a welcome alternative to tapping the capital markets.