An Exploratory Study of the Safety and Efficacy of Prophylactic Immunomodulatory Treatment in Myozyme-naive Cross-Reacting Immunologic Material (CRIM[-]) Patients With Infantile-Onset Pompe Disease
The purpose of this study was to evaluate the efficacy, clinical benefits and safety of a prophylactic immunomodulatory regimen given prior to first treatment with alglucosidase alfa (Myozyme®) in patients with infantile-onset Pompe disease.
The objectives were to assess the efficacy of a prophylactic immunomodulatory regimen given prior to first treatment with alglucosidase alfa, as assessed by anti-recombinant human acid alpha-glucosidase (anti-rhGAA) antibody titers, and antibodies that inhibit the activity and/or uptake of alglucosidase alfa; to evaluate the clinical benefit as measured by overall survival, ventilator-free survival, left ventricular mass index (LVMI), gross motor function and development, disability index and the incidence of adverse events (AEs), serious adverse events (SAEs), and clinical laboratory abnormalities.
|Pompe Disease Glycogen Storage Disease Type II||Biological: Alglucosidase Alfa Drug: Methotrexate Drug: Rituximab||Phase 4|
|Study Design:||Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
|Official Title:||An Exploratory Study of the Safety and Efficacy of Prophylactic Immunomodulatory Treatment in Myozyme®-Naive, CRIM(-) Patients With Infantile-onset Pompe Disease|
- Change From Baseline in Number of Patients With Anti-Recombinant Human Acid Alfa-glucosidase (Anti-rhGAA) Immunoglobulin G (IgG) Antibody at End of Study [ Time Frame: Baseline, End of Study (up to Week 79 or early termination) ]Serum samples from patients were analyzed for the presence of anti-rhGAA IgG antibodies. End of study (EOS) refers to the last post baseline observation during study period (up to Week 79).
- Number of Patients With Recombinant Human Acid Alfa-glucosidase (rhGAA) Inhibitory Antibody at End of Study [ Time Frame: End of study (up to Week 79) ]Patients with positive anti-rhGAA IgG antibody were assessed for the presence of inhibitory antibodies (inhibition of enzyme activity and inhibition of enzyme uptake). Enzyme-linked immunosorbent assay (ELISA) was used to measure inhibition of rhGAA enzymatic activity in vitro and a cell-based assay was used to measure the inhibition of the uptake of rhGAA in normal fibroblast cells by flow cytometry.
- Number of Patients Who Survived at End of Study [ Time Frame: Baseline up to End of study (Week 79) ]
- Number of Patients With Normal/Abnormal Left Ventricular Mass (LVM) Z-Score and LVM Index at End of Study [ Time Frame: End of study (up to Week 79 or early termination) ]LVM Z-score and LVM index were assessed by ECHO. LVM Z-Score provides an indicator of degree of standard deviations from the mean in a normal distribution. Negative values indicate a smaller LVM than mean and values higher than 0 indicate a larger LVM than the mean. The normal range for LVM Z-Score is -2 to 2. Values <-2 or >2 indicate abnormal LVM Z-Score. LVM index is an index value derived by normalizing LVM by body surface area. LVM index provides evidence of cardiomyopathy. LVM index values <65 gram per meter^2 (g/m^2) were considered as normal and LVM index values >=65 g/m^2 were considered as abnormal. End of study refers to the last post baseline observation during study period (up to Week 79).
- Number of Patients With Ventilator Use at End of Study [ Time Frame: End of study (up to Week 79 or early termination) ]Number of patients who had ventilator support at end of study was reported. End of study refers to the last post baseline observation during study period (up to Week 79).
- Gross Motor Disability Assessed by Gross Motor Function Measure-88 (GMFM-88) at End of Study [ Time Frame: End of study (up to Week 79 or early termination) ]GMFM-88 is an 88-item measure to detect gross motor function. It consists of 5 categories: lying and rolling; sitting; crawling and kneeling; standing; walking, running and jumping. Each item is scored on a 4-point Likert scale (0 = cannot do; 1 = initiates [<10% of the task]; 2 = partially completes [10% to <100% of the task]; 3 = task completion). The score for each dimension is expressed as a percentage of the maximum score for that dimension. Total score is obtained by adding the percentage scores for each dimension and dividing the sum by the total number of dimensions. Total score ranges from 0% to 100%, where higher scores indicate better motor functions. A total score of <7.5% demonstrates gross motor disability. End of study refers to the last post baseline observation during study period (up to Week 79).
- Motor Development Status Assessed by Alberta Infantile Motor Scale (AIMS) at End of Study [ Time Frame: End of study (up to Week 79 or early termination) ]AIMS is a 58-item reliable and valid measure of motor development for infants at risk for motor delay. It assesses infant movement in 4 positions (subscales): prone (reciprocal crawling); supine (moving hands to feet); sitting (sitting with arm support); and standing (pulls to stand). For each subscale, items were scored as "observed" or "not observed". Item in the observed range create a motor window. When scoring, subscale scores are calculated by giving the child credit (1 point) for observed items within the motor window in addition to being given credit (1 point) for all of the less mature items before motor window. AIMS total score was calculated by summing the scores for 58 items and ranged from 0 to 58, with higher score indicating more mature motor development. Score was then compared with age-equivalent peers from normative sample and equivalence level age (in months) is reported. End of study refers to the last post baseline observation during study period (up to Week 79).
- Disability Index Assessed by the Pompe Pediatric Evaluation of Disability Inventory (Pompe PEDI) at End of Study [ Time Frame: End of study (up to Week 79 or early termination) ]The Pompe PEDI is a disease specific version of the PEDI that was developed to assess functional capabilities and performance in children with Pompe disease from 2 months through adolescence. It consists of all items of the original PEDI (197 functional skill items in 3 domains: self-care; mobility; and social function) and additional items in the functional skills, mobility, and self-care domains to reflect clinically relevant functional skills for children with Pompe disease. Each domain consisted of 2 subdomains: functional skill performance and caregiver assistance scale. Norm-based scoring was developed for these additional items, and scoring algorithms for the PEDI have been adjusted to reflect additional normative data collected for the Pompe PEDI. Total score range for each domain (mean of subdomains) and subdomain ranges from 0 to 100, where higher score indicates high capability. End of study refers to the last post baseline observation during study period (up to Week 79).
|Study Start Date:||October 2009|
|Study Completion Date:||March 2013|
|Primary Completion Date:||March 2013 (Final data collection date for primary outcome measure)|
Experimental: Alglucosidase Alfa
Alglucosidase alfa (Myozyme®) 20 milligrams per kilogram (mg/kg) intravenous (IV) infusion every other week (qow) (or optionally 20 mg/kg IV infusion every week [qw]) beginning from Day 0 to a minimum of 18 months or if the patient was less than (<) 6 months of age at the time of enrollment, until the patient was 2 years of age, along with methotrexate 0.4 mg/kg subcutaneously for 3 consecutive days qow beginning from Day 0 to Week 6 (9 doses) and rituximab 375 milligrams per square meter (mg/m^2) (or 12.5 mg/kg for patients with body surface area less than or equal to 0.5 m^2) IV infusion qw beginning from Day -1 to Week 4 (4 doses) as per local prescribing information. An additional 4-week cycle of rituximab (up to 4 additional doses) and 6-week cycle of methotrexate (up to 9 additional doses) may have been administered within the first 6 months of the study as per local prescribing information.
Biological: Alglucosidase Alfa
Administered as IV infusion.
Other Name: Myozyme®Drug: Methotrexate
Administered subcutaneously.Drug: Rituximab
Administered as IV infusion.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00701129
|United States, Kentucky|
|Kosair Children's Hospital|
|Louisville, Kentucky, United States, 40202|
|United States, North Carolina|
|Duke University Medical Center|
|Durham, North Carolina, United States, 27710|
|Study Director:||Medical Monitor||Genzyme Coorporation|