Extension Study of Idursulfase-IT Along With Elaprase in Children and Adults With Hunter Syndrome and Cognitive Impairment

An Open-Label Extension for Subjects in Studies HGT-HIT-046 and SHP609-302 Evaluating Long-Term Safety of Intrathecal Idursulfase-IT Administered in Conjunction With Intravenous Elaprase® in Subjects With Hunter Syndrome and Cognitive Impairment

The study is an extension of two previous studies (HGT-HIT-046 [NCT01506141] and SHP609-302 [NCT02412787]). Participants must have completed one of the previous studies. The main aim of this study is to collect more information about the safety of the treatments, idursulfase-IT and elaprase, in children and adults with Hunter syndrome and cognitive impairment. Participants will receive the same treatment as in the previous studies.

The drug being tested in this study is called idursulfase. Idursulfase is being tested for long term safety in participants with Hunter syndrome and cognitive impairment.

The study will enroll up to approximately 8 patients. Participants will receive idursulfase-IT via intrathecal drug delivery device (IDDD) once monthly along with elaprase intravenous (IV) infusion, weekly.

This multi-center trial will be conducted in France and Canada. The overall time to participate in this study is approximately 4.8 years.

Inclusion Criteria:

1. The participant must have completed end of study assessments in studies HGT-HIT-046 [NCT01506141] or SHP609-302 [NCT02412787] and received a clinical benefit from idursulfase-IT in the opinion of the investigator.
2. The participant, or participant's legally designated representative, must have been informed of the nature of this open-label extension and must have voluntarily signed an Institutional Review Board (IRB)/Independent Ethics Committee (IEC) approved informed consent form after all relevant aspects of the study have been explained and discussed. Written consent of the participant's legally designated representative (if applicable) and the participant's consent/assent, as relevant, must be obtained.
3. The participant has continued to receive elaprase on a regular basis in studies HGT-HIT-046 or SHP609-302.

Exclusion Criteria:

1. The participant has experienced, in the opinion of the investigator, a safety or medical issue that contraindicates treatment with idursulfase-IT, including, but not limited to, uncontrolled seizure disorder, bleeding disorder, and clinically relevant hypertension.
2. The participant has clinically relevant intracranial hypertension.
3. The participant is enrolled in another clinical study, other than studies HGT-HIT-046 or SHP609-302, that involves clinical investigations or use of any investigational product (drug or [intrathecal/spinal] device) within 30 days prior to study enrolment or at any time during the study.