Children with CMT1A, the most common type, progressed at a rate of 1.8 points (12%), while those with CMT2A and CMT4C presented faster progression rates compared with CMT1A, and progression in CMT1B was highly variable.8Similar results were found with children and adolescents with CMT1A in the present study when they were analyzed separately from the other CMT subtypes. Here, PMP22 is linked to Charcot-Marie-Tooth disease.