• Participation in an eligible drisapersen study as follows:

(A) Prior DMD114876 subjects: Subjects who completed both the 24 week double-blind treatment and 24 week post-treatment phases in study DMD114876 OR Subjects who withdrew from the treatment portion of study DMD114876 due to meeting laboratory safety stopping criteria may be eligible to enrol in the extension study if: the laboratory parameters that led to stopping have resolved; the principal investigator (PI) considers the benefit of further treatment with drisapersen outweighs the risk to the individual subject; and following consultation with the Medical Monitor (B) Prior DMD114044 Subjects: US subjects who completed study DMD114044 in another country and who want to return to the US to participate in study DMD115501, upon agreement by a DMD115501 Investigator OR US citizens who participated in DMD114044 but who had to withdraw from the study due to meeting laboratory safety stopping criteria may be eligible to enrol in DMD115501 if: the laboratory parameters that led to stopping have resolved; the PI considers the benefit of further treatment with drisapersen outweighs the risk to the individual subject; and following consultation with the Medical Monitor and upon agreement by a DMD115501 investigator (C) Prior DMD114349 Subjects: US subjects who participated in and completed study DMD114044 in another country and who entered into the ongoing open-label extension study DMD114349 in a country outside the US who wish to withdraw from DMD114349 and return to the US to participate in study DMD115501, upon agreement by a DMD115501 investigator.

Canadian subjects who participated in the DMD114349 study OR Canadian subjects who withdrew from the treatment portion of the study DMD114349 due to meeting laboratory safety stopping criteria may be eligible to enroll in the extension study if the laboratory parameters that led to stopping have resolved; the PI considers the benefit of further treatment with drisapersen outweighs the risk to the individual subject; and following consultation with the Medical Monitor.

• Continued use of glucocorticoids for a minimum of 60 days prior to study entry with a reasonable expectation that the subject will remain on steroids for the duration of the study. Changes to or cessation of glucocorticoids will be at the discretion of the PI in consultation with the subject/parent and the Medical Monitor. If subject is not on steroids, involvement in the study needs to be discussed with the medical monitor.
• Willing and able to comply with all protocol requirements and procedures (with the exception of those assessments requiring a subject to be ambulant, for those subjects who have lost ambulation)
• Able to give informed assent and/or consent in writing signed by the subject and/or parent(s)/legal guardian (according to local regulations)

• Subject had a serious adverse experience or who met safety stopping criteria that remains unresolved from studies DMD114876, DMD114044, or DMD114349, which in the opinion of the investigator could have been attributable to study medication, and which is ongoing. Once resolved, subject may be eligible to enrol following PI consultation with the Medical Monitor
• Use of anticoagulants, antithrombotics or antiplatelet agents, or previous treatment with investigational drugs except for drisapersen, within 28 days of the first administration of study medication
• Participation in any other investigational clinical trial within 30 days prior to the start of screening, or during this clinical study. If subject has participated in any other study within 6 months, this should be discussed with the medical monitor prior to study entry.
• History of significant medical disorder which may confound the interpretation of either efficacy or safety data (e.g. current or history of renal or liver disease/impairment, history of inflammatory illness)
• Symptomatic cardiomyopathy. If subject has a left ventricular ejection fraction <45% at Screening, the investigator should discuss inclusion of subject in the study with the medical monitor
• A platelet count under the lower limit of normal at screening. A re-test within the screening period is permissible and if within normal range the subject may enter the study