Natalizumab Re-Initiation of Dosing
The primary objectives of this study are to further evaluate the safety of natalizumab (Tysabri®) monotherapy by evaluating the risk of hypersensitivity and immunogenicity following re-exposure to natalizumab, and to confirm the safety of switching to natalizumab from interferon beta (IFN-β), glatiramer acetate (GA), or other multiple sclerosis (MS) therapies.
Multiple Sclerosis, Relapsing-Remitting
Biological: BG00002 (natalizumab)
|Study Design:||Endpoint Classification: Safety Study
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
|Official Title:||An Open-Label, Multicenter, Extension Study to Evaluate the Safety and Tolerability of Natalizumab Following Re-Initiation of Dosing in Multiple Sclerosis Subjects Who Have Completed Study C-1801, C-1802, or C-1803 and a Dosing Suspension Safety Evaluation|
- Number of Participants With Treatment-Emergent Adverse Events (AEs) and Serious AEs (SAEs) [ Time Frame: Baseline through Week 48 ] [ Designated as safety issue: Yes ]AEs: any sign, symptom, or diagnosis/disease that is unfavorable or unintended, that is new, or if pre-existing, worsens in participants administered a pharmaceutical product and that does not necessarily have a causal relationship with this treatment. SAEs: an event that results in death; an event that, in the view of the investigator, places the participant at immediate risk of death (a life-threatening event); an outcome that results in a congenital anomaly/birth defect diagnosed in a child of a participant; an event that requires or prolongs inpatient hospitalization; an event that results in persistent or significant disability/incapacity. Any other medically important event that, in the opinion of the investigator, may jeopardize the participant or may require intervention to prevent one of the other outcomes listed in the definition above. Treatment-emergent AEs: events in participants who had received at least 1 dose of study drug, regardless of relationship to study drug.
- Number of Participants With Hypersensitivity-related Adverse Events [ Time Frame: Baseline through Week 48 ] [ Designated as safety issue: Yes ]For purposes of this analysis, the terms 'hypersensitivity' and 'drug hypersensitivity' were categorized by their temporal relationship to study drug infusion (within 2 hours of the start of the infusion), and were considered equivalent. Hypersensitivity reactions are defined as infusion reactions with the following preferred terms: hypersensitivity not otherwise specified (NOS), anaphylactic reaction, anaphylactoid reaction, dermatitis allergic, drug hypersensitivity, urticaria NOS, vasoconstriction, urticaria generalised, hypersensitivity, urticaria.
- Number of Participants With Antibodies to Natalizumab [ Time Frame: Baseline (Week 0), Week 4, Week 24 (test was repeated after 8 weeks if positive, to confirm persistence) ] [ Designated as safety issue: Yes ]'Positive with unknown persistence' is defined as a positive result (≥0.5 micrograms/mL) at one timepoint only with no confirmatory re-test available at least 42 days later. 'Transient positive' is defined as a positive at one timepoint but negative upon re-test at least 42 days later. 'Persistent positive' is defined as positive at 2 or more timepoints separated by at least 42 days. The threshold for classifying a sample as 'antibody positive' was set at the lowest level of reactivity that had a measurable impact on drug serum concentrations.
|Study Start Date:||March 2006|
|Study Completion Date:||February 2008|
|Primary Completion Date:||December 2007 (Final data collection date for primary outcome measure)|
All study participants in 101-MS-322 (NCT00306592) and 101-MS-321 (NCT00297232) received open label 300 mg intravenous (IV) natalizumab 60-minute infusion once every 4 weeks (28 days ±7 days) for up to 48 weeks. After 48 weeks, participants from 101-MS-322 (NCT00306592) entering study 101-MS-321 (NCT 00297232; considered the Long-Term Treatment Period of 101-MS-322) were continued on treatment from Week 52 through Week 480.
Biological: BG00002 (natalizumab)
Other Name: Tysabri
Study 101-MS-322 (NCT00306592) is conducted to evaluate the safety of natalizumab monotherapy following re-exposure to natalizumab of former clinical trial participants in Studies C-1801 (NCT00027300), C-1802 (NCT00030966), and C-1803 (NCT00097760). This study includes participants in North America. In parallel with the conduct of this study, a similar study, 101-MS-321 (NCT00297232) is initiated for participants in Europe and the rest of the world. The primary purpose and primary outcome for both studies are identical, therefore, the combined Week 48 data from both studies are presented. In addition, after 48 weeks, participants from 101-MS-322 (NCT00306592) can enter study 101-MS-321 (NCT 00297232), which is considered the Long-Term Treatment Period of 101-MS-322 (NCT00306592).
Please refer to this study by its ClinicalTrials.gov identifier: NCT00306592
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|Study Director:||Medical Director||Biogen|