An Extension Study of HGT-HIT-045 Evaluating Long-Term Safety and Clinical Outcomes of Idursulfase-IT in Conjunction With Elaprase in Pediatric Participants With Hunter Syndrome and Cognitive Impairment
- Registration Number
- NCT01506141
- Lead Sponsor
- Shire
- Brief Summary
This extension study of HGT-HIT-045 is designed to collect long-term safety data in pediatric participants with Hunter syndrome and cognitive impairment who are receiving intrathecal (IT) idursulfase-IT and intravenous (IV) Elaprase enzyme replacement therapy.
- Detailed Description
Not available
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- Male
- Target Recruitment
- 25
- Participant must have completed all study requirements and End of study (EOS) assessments for study HGT-HIT-045 (NCT00920647) prior to enrolling in Study HGT-HIT-046 and must have no safety or medical issues that contraindicate participation.
- The participant's parent(s) or legally authorized guardian(s) 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. Consent of the participant's parent(s) or legally authorized guardian(s) and the participant's assent, as relevant, must be obtained.
- The participant has received and tolerated a minimum of 12 months of treatment with weekly IV infusions of Elaprase and has received 80% of the total planned infusions within the last 6 months.
-
The participant is enrolled in another clinical study that involves clinical investigations or use of any investigational product (drug or device) other than the PORT-A-CATH IDDD within 30 days prior to study enrollment or at any time during the study.
-
The participant is unable to comply with the protocol (eg, is unable to return for safety evaluations, or is otherwise unlikely to complete the study) as determined by the investigator.
-
The participant has experienced an adverse reaction to study drug in Study HGT-HIT-045 (NCT00920647) that contraindicates further treatment with intrathecal idursulfase-IT.
-
The participant has a known hypersensitivity to any of the components of idursulfase-IT.
-
The participant has any known or suspected hypersensitivity to anesthesia or is thought to be at an unacceptably high risk for anesthesia due to airway compromise or other conditions.
-
The participant has a condition that is contraindicated as described in the SOPH-A-PORT Mini S IDDD Instructions for Use, including:
-
The participant has had, or may have, an allergic reaction to the materials of construction of the SOPH-A-PORT Mini S device
-
The participant's body size is too small to support the size of the SOPH-A-PORT Mini S Access Port, as judged by the investigator
-
The participant's drug therapy requires substances known to be incompatible with the materials of construction
-
The participant has a known or suspected local or general infection
-
The participant is at risk of abnormal bleeding due to a medical condition or therapy
-
The participant has one or more spinal abnormalities that could complicate safe implantation or fixation
-
The participant has a functioning CSF shunt device
-
The participant has shown an intolerance to an implanted device
An additional exclusion criterion for patients who were previously untreated with intrathecal idursulfase-IT in Study HGT-HIT-045 (NCT00920647):
-
-
The participant has an opening CSF pressure upon lumbar puncture that exceeds 30.0 centimeter (cm) water (H2O).
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- SINGLE_GROUP
- Arm && Interventions
Group Intervention Description Idursulfase-IT Idursulfase-IT Idursulfase-IT will be administered once monthly and weekly IV infusions of Elaprase at the dose used in study HGT-HIT-045 via intrathecal drug delivery device (IDDD). Idursulfase-IT Elaprase Idursulfase-IT will be administered once monthly and weekly IV infusions of Elaprase at the dose used in study HGT-HIT-045 via intrathecal drug delivery device (IDDD).
- Primary Outcome Measures
Name Time Method Number of Participants With Treatment-emergent Adverse Events (TEAEs) From start of study drug administration up to follow-up (169 months) An adverse event (AE) is any noxious, pathologic, or unintended change in anatomical, physiologic, or metabolic function as indicated by physical signs, symptoms, and/or laboratory changes occurring in any phase of a clinical trial, and whether or not considered study drug-related. Treatment-emergent AEs are defined as all AEs occurring on or after the first IDDD surgery date or first dose (whichever is earlier) for the participant (whether it is in this extension study or in HGT HIT-045 \[NCT00920647\]) and before the end of the study (EOS) visit (+30 days).
- Secondary Outcome Measures
Name Time Method Area Under the Curve Extrapolated to Infinity (AUC0-infinity) of Idursulfase Administered as Intrathecal and in Conjunction With Elaprase 15 minutes prior to IT injection, 1, 2, 3, 4, 6, 8, 12, 24, 30 and 36 hours (h) following IT injection on Weeks 3 and 23, Day 2 of Months 19, 31, and 43 Area under the curve extrapolated to infinity, calculated using the observed value of the last non-zero concentration (AUC0-infinity) of idursulfase will be assessed.
Area Under the Curve From the Time of Dosing to the Last Measureable Concentration (AUC0-t) of Idursulfase Administered as Intrathecal and in Conjunction With Elaprase 15 minutes prior to IT injection, 1, 2, 3, 4, 6, 8, 12, 24, 30 and 36 hours following IT injection on Weeks 3 and 23, Day 2 of Months 19, 31, and 43 Area under the curve from the time of dosing to the last measureable concentration (AUC0-t) of idursulfase will be assessed.
Maximum Observed Concentration (Cmax) of Idursulfase Administered as Intrathecal and in Conjunction With Elaprase 15 minutes prior to IT injection, 1, 2, 3, 4, 6, 8, 12, 24, 30 and 36 hours following IT injection on Weeks 3 and 23, Day 2 of Months 19, 31, and 43 Maximum Observed Concentration (Cmax) of idursulfase will be assessed.
First Order Rate Constant (Lambda z) of Idursulfase Administered as Intrathecal and in Conjunction With Elaprase 15 minutes prior to IT injection, 1, 2, 3, 4, 6, 8, 12, 24, 30 and 36 hours following IT injection on Weeks 3 and 23, Day 2 of Months 19, 31, and 43 First order rate constant (Lambda z) of idursulfase will be assessed.
Terminal Half-life (t1/2) of Idursulfase Administered as Intrathecal and in Conjunction With Elaprase 15 minutes prior to IT injection, 1, 2, 3, 4, 6, 8, 12, 24, 30 and 36 hours following IT injection on Weeks 3 and 23, Day 2 of Months 19, 31, and 43 Terminal half-life (t1/2) of idursulfase will be assessed.
Time of Maximum Observed Concentration (tmax) of Idursulfase Administered in as Intrathecal and in Conjunction With Elaprase 15 minutes prior to IT injection, 1, 2, 3, 4, 6, 8, 12, 24, 30 and 36 hours following IT injection on Weeks 3 and 23, Day 2 of Months 19, 31, and 43 Time of maximum observed concentration (tmax) of idursulfase will be assessed.
Total Body Clearance for Extravascular Administration Divided by the Fraction of Dose Absorbed (Cl/F) of Idursulfase-IT Administered as Intrathecal and in Conjunction With Elaprase 15 minutes prior to IT injection, 1, 2, 3, 4, 6, 8, 12, 24, 30 and 36 hours following IT injection on Weeks 3 and 23, Day 2 of Months 19, 31, and 43 Total body clearance for extravascular administration divided by the fraction of dose absorbed (Cl/F) of idursulfase will be assessed.
Volume of Distribution Associated With the Terminal Slope Following Extravascular Administration Divided by the Fraction of Dose Absorbed (Vz/F) of Idursulfase Administered as Intrathecal and in Conjunction With Elaprase 15 minutes prior to IT injection, 1, 2, 3, 4, 6, 8, 12, 24, 30 and 36 hours following IT injection on Weeks 3 and 23, Day 2 of Months 19, 31, and 43 Volume of distribution associated with the terminal slope following extravascular administration divided by the fraction of dose absorbed (Vz/F) of idursulfase will be assessed.
Total Body Clearance (Cl) of Elaprase 15 minutes prior to IV infusion, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 5, 6, 7, 9, 11, and 24 hours during/after the IV infusion on Weeks 3 and 23 Total body clearance (Cl) of Elaprase will be assessed.
Volume of Distribution (Vz) of Elaprase 15 minutes prior to IV infusion, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 5, 6, 7, 9, 11, and 24 hours during/after the IV infusion on Weeks 3 and 23 Volume of distribution associated with the terminal slope (Vz) of Elaprase will be assessed.
Observed Steady-state Volume of Distribution (Vss) of Elaprase 15 minutes prior to IV infusion, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 5, 6, 7, 9, 11, and 24 hours during/after the IV infusion on Weeks 3 and 23 Observed steady-state volume of distribution (Vss) of Elaprase will be assessed.
Mean Residence Time (MRT) of Elaprase 15 minutes prior to IV infusion, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 5, 6, 7, 9, 11, and 24 hours during/after the IV infusion on Weeks 3 and 23 Mean residence time (MRT) of Elaprase will be assessed.
Change From Baseline in CSF Biomarkers Baseline, Day 2 of Week 1, Day 2 Pre dose on Weeks 3, 7, 11, 15, 19, 23, 27, Months 7 - 169 Change from baseline in CSF biomarkers glycosaminoglycan (GAG \[HS/DS\]) will be assessed.
Change From Baseline in Urinary Glycosaminoglycan (GAG) Baseline, Day 1 Predose on Weeks 3, 7, 11, 15, 19, 23, 27, Months 7 - 169 Change from baseline in urinary GAG will be assessed.
Trial Locations
- Locations (9)
British Columbia Children's Hospital
🇨🇦Vancouver, British Columbia, Canada
Birmingham Children's Hospital
🇬🇧Birmingham, United Kingdom
Ann & Robert H Lurie Childrens Hospital of Chicago
🇺🇸Chicago, Illinois, United States
University of North Carolina at Chapel Hill
🇺🇸Chapel Hill, North Carolina, United States
Legacy Emanuel Hospital
🇺🇸Portland, Oregon, United States
Children's Hospital of Pittsburgh of UPMC
🇺🇸Pittsburgh, Pennsylvania, United States
Vanderbilt Children's Hospital
🇺🇸Nashville, Tennessee, United States
University of Utah Hospital
🇺🇸Salt Lake City, Utah, United States
Seattle Children's Hospital
🇺🇸Seattle, Washington, United States