To the Editor The review by Corey1 and the accompanying editorial paint a very positive picture about the potential of antisense oligonucleotides (ASOs) to treat neurological diseases such as Friedrich ataxia,2 spinal muscular atrophy,3 and Duchenne muscular dystrophy. Although the principle on which ASO-based treatment is based is promising, a review of the literature, however, reveals critical lacunae in the data that have been used to claim efficacy.