A Prospective Study to Observe & Describe Clinical Outcomes of Alglucosidase Alfa Treatment in Patients ≤6 Months of Age With Infantile-onset Pompe Disease (IOPD)
Investigating the Effects of Alglucosidase Alfa on Infantile-Onset Pompe Disease
Study Overview
Primary Objective:
To describe the effect of routine practice with alglucosidase alfa in patients with IOPD ≤6 months of age, on invasive ventilation-free survival after 52 weeks of treatment.
Secondary Objectives:
- To describe the effect of routine practice with alglucosidase alfa on invasive ventilation-free survival and survival at 12 and 18 months of age, as well as on change in left ventricular mass (LVM) Z score, Alberta Infant Motor Scale (AIMS) score, body weight, body length, and head circumference Z scores, and urinary glucose tetrasaccharide (Hex4), at Week 52 of treatment.
- To describe the safety, tolerability, and immunogenicity of alglucosidase alfa in the routine practice of IOPD treatment.
Study Details
The planned duration of observation for each participant will be 104 weeks after enrollment, to determine secondary outcomes at 18 months (approximately 78 weeks) of age.
Eligibility Criteria
You may be eligible for this study if you meet the following criteria:
- Conditions: Glycogen Storage Disease Type II
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Age: 6 months or below
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Gender: All
Inclusion Criteria:
- At the time of informed consent, participants must be ≤6 months of age, corrected for gestation if necessary. Gestational age <40 weeks will be adjusted to a full-term gestational age of 40 weeks.
- Participants must have alglucosidase alfa enzyme replacement therapy (ERT) planned or initiated for IOPD treatment irrespective of study participation, according to the treating physician's decision regarding participants' routine disease management.
- Participants must have available and accessible medical records from the time of IOPD diagnosis and from subsequent follow-up.
- Participants must have a confirmed diagnosis of IOPD, defined as presence of 2 pathogenic acid alpha glucosidase (GAA) variants and documented GAA deficiency in blood (dried blood spot [DBS] accepted), skin, or muscle tissue, or presence of 1 pathogenic GAA variant and documented GAA deficiency in blood, skin, or muscle tissue from separate samples (either from 2 different tissues or from the same tissue but at 2 different sampling dates.) (DBS and leukocytes are acceptable as 2 different samples from blood).
- Participants must have established cross-reacting immunologic material (CRIM) status available prior to enrollment. CRIM status may be provided by historical CRIM testing results or prediction of CRIM status based on genotyping performed at a Clinical Laboratory Improvement Amendments (CLIA) or other appropriately certified genetic laboratory.
- Participants must have cardiomyopathy at the time of diagnosis (LVMI equivalent to
mean age-specific LVMI):
- LVMI +1 standard deviation (SD) in participants diagnosed by newborn or sibling screening,
- LVMI +2 SD in participants diagnosed by clinical evaluation.
- Participants must have informed consent provided by parent(s)/legally acceptable
representatives (LARs).
Exclusion Criteria:
- Participants with respiratory insufficiency, defined as:
- Oxygen saturation <90% on room air as determined by pulse oximetry,
- Venous partial pressure of carbon dioxide (pCO2) >55 mmHg or arterial pCO2 >40 mmHg on room air,
- Use of invasive (with intubation or tracheostomy) or noninvasive (no intubation or tracheostomy) ventilation at enrollment, for participants not having started ERT at enrollment,
- Use of invasive or noninvasive ventilation at the time of ERT initiation, for participants having started ERT before enrollment.
- Participants with major congenital abnormality including heart defect, neural tube
defect, or Down syndrome that, in the opinion of the investigator, would preclude participation in the study or potentially decrease survival.
- Participants with clinically significant organic disease other than signs/symptoms related to Pompe disease, including clinically significant cardiovascular, hepatic, pulmonary, neurologic, or renal disease, or other medical condition, serious intercurrent illness, or circumstance that, in the opinion of the investigator, would preclude participation or potentially decrease survival.
- Previous or ongoing treatment in any clinical trial of, or managed access program for, avalglucosidase alfa or any other Pompe disease-specific therapy.
The above information is not intended to contain all considerations relevant to a patient's potential participation in a clinical trial.
This study investigates the effects of an investigational medication on infants with a condition called Infantile-Onset Pompe Disease (IOPD). IOPD is a rare genetic disorder where the body cannot break down a complex sugar called glycogen, leading to muscle weakness and heart problems. The study aims to understand how the medication affects survival without the need for a breathing machine after one year of treatment.
Participants will undergo various procedures, including monitoring of heart function, growth measurements, and motor skills assessments. These include checking the size of the heart, tracking weight and length, and evaluating motor development. Safety and immune response to the medication will also be observed.
- Who can participate: Infants up to 6 months old with a confirmed diagnosis of IOPD, verified through medical records, can participate. They must have started or be planning to start enzyme replacement therapy and have a known CRIM status.
- Study details: Participants will undergo enzyme replacement therapy and take part in regular assessments to monitor their health and response to the investigational medication. A placebo will not be used in this study.
- Study Timelines: The study will last 104 weeks.
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