This is a multicenter, observational study of participants receiving Translarna based on inclusion of their data in a registry. This study is intended to enroll 270 participants across ~50 care centers in Europe and other regions over a period of ~ 2 years. The study population will include participants who are receiving usual care treatment with commercial supply of Translarna (or receiving care within a named participant early access program) and who provide consent. Participants will be followed for at least 5 years from their date of enrollment. Safety and efficacy data will be collected in conjunction with routine visits conducted as per usual care. Although there are no protocol-mandated procedures, it is expected that physicians and other caregivers will follow published treatment guidelines and standards of care.