One-Time treatment aims to halt devastating childhood brain disease

This study tested a one-time gene therapy called OTL-200 for children with early-onset metachromatic leukodystrophy (MLD), a rare and fatal genetic brain disease. The treatment involved collecting a child's own blood stem cells, fixing the genetic error in a lab, and returning them to the body. The goal was to see if this single procedure could safely stop or slow the disease's progression in 10 young children, most of whom had not yet shown symptoms.