Inflammatory symptoms of Cryopyrin-Associated Periodic Syndrome (CAPS) are due to mutations in a the NLRP-3 gene (previously known as Cold Induced Autoinflammatory Syndrome-1 or CIAS1). These mutations result in the body's overproduction of interleukin-1 (IL-1), a protein that stimulates the inflammatory process. IL-1 Trap (rilonacept) was designed to bind to the interleukin-1 cytokine and prevent it from binding to its receptors in the body.
Full Title of Study: “IL1T-AI-0505: A Multi-center, Double-Blind, Placebo-Controlled Study of the Safety, Tolerability, & Efficacy of Rilonacept in Subjects With Cryopyrin-Associated Periodic Syndromes (CAPS) Using Parallel Group & Randomized Withdrawal Designs”
- Study Type: Interventional
- Study Design
- Allocation: Randomized
- Intervention Model: Parallel Assignment
- Primary Purpose: Treatment
- Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
- Study Primary Completion Date: June 2008
Primary Objective: The primary objective of this study was to assess the effect of rilonacept on the clinical signs and symptoms of Cryopyrin-Associated Periodic Syndrome (CAPS) when used for chronic therapy as evaluated by the subjects themselves over time using a validated patient-reported outcomes tool. Secondary Objective(s): The secondary objectives were as follows: – To determine the safety and tolerability of rilonacept in subjects with CAPS – To assess the effect of rilonacept on laboratory measures of inflammation such as acute phase reactants This was a multi-center, two-part, double-blind, placebo-controlled study (Parts A and B) designed to assess the efficacy, safety, and tolerability of weekly subcutaneous (SC) doses of 160 mg of rilonacept in adult subjects with active CAPS. These phases were followed by extended open-label phases. After written informed consent was obtained, subjects who met the protocol eligibility criteria were enrolled at one of 27 study sites in the United States. The study consisted of a 3-week screening period preceding Part A, a 6-week long double-blind, randomized phase of the study. All subjects were then treated with single-blind rilonacept for 9-weeks, followed by a subsequent 9-week, double-blind, withdrawal phase during which subjects were re-randomized to either rilonacept or placebo. Subjects then continued treatment in a 24-week open-label extension phase (OLE) and a further 112-week long-term open-label extension (LTOLE), during which all subjects received rilonacept and a 6-week post-treatment follow-up period. Amendments 4 and 6 allowed eligible adult and pediatric subjects aged 7 and above to enroll directly into the open-label phases of the trial. For reporting purposes, the 24-week OLE and the 112-week LTOLE was considered one Open Label Extension (OLE) phase. This occurred after the 24-week double blind (Parts A and B ) phase. In other words, OLE Week 1 corresponded to the week 25 in the study. OLE Week 72 was the final timepoint where efficacy was measured. Safety continued after that timepoint until the end of the study.
- Drug: rilonacept 160 mg
- Rilonacept was given by subcutaneous injection. It was administered weekly at the dose of 160mg. On Day 1, subjects received two injections of rilonacept (for a total of 320 mg).
- Drug: Placebo
- Subcutaneous injection of Placebo occurred during first 6 weeks of the study or during randomized withdrawal (weeks 15-24). On Day 1, subjects received two placebo injections.
- Drug: rilonacept 160 mg
- Rilonacept was given by subcutaneous injection. It was administered weekly at the dose of 160mg. No loading dose was given for subjects who entered directly into the open-label.
Arms, Groups and Cohorts
- Placebo Comparator: Placebo
- Some subjects were treated with Placebo in the Study. This occurred (if subject randomized to Placebo) either during the first 6 weeks of the study or during the randomized withdrawal (weeks 15-24).
- Active Comparator: rilonacept 160 mg
- If randomized to rilonacept, subjects received this treatment during the first 6 weeks of the study or during the randomized withdrawal (weeks 15-24). All subjects received rilonacept 160 mg during weeks 6-14 (between Parts A and B). Study drug is administered as a 2.0 mL subcutaneous injection once a week. At baseline (week 0) subjects receive a loading dose of rilonacept 320 mg.
- Other: Open-Label rilonacept 160 mg
- After week 24 (the end of part B), all subjects went into weekly dosing of open label rilonacept 160 mg. During this phase of the study, adolescents aged 7 and above were entered into the study and rilonacept was dosed as 2.2 mg/kg injections, up to 160 mg, per week. Study drug is administered as a 2.0 mL subcutaneous injection once a week.
Clinical Trial Outcome Measures
- Change From Baseline to Week-6 (Part A) Endpoint in Mean Key Symptom Score (KSS)
- Time Frame: Baseline (Days -21 to -1) and Week 6 (Days 21-42)
- The mean Key Symptom Score (KSS –from the validated, patient-administered Daily Health Assessment Form(DHAF)) was the average on a 0-10 scale (0=None, 10=Very Severe) of 5 separate scales — rash, feeling of fever/chills, joint pain, eye redness/pain, and fatigue). KSS was averaged over two 21-day daily reporting periods (the 3 weeks prior to both baseline and week 6). In part A, a negative change in mean values indicated improvement under treatment with rilonacept in symptoms. The DHAF was used because it is a validated instrument to collect subject’s self-reported responses.
- Mean Change in Key Symptom Score (KSS) From Week 15 to Week 24 (During the Randomized Withdrawal Phase or Part B)
- Time Frame: Week 15 through Week 24 (randomized withdrawal)
- The mean Key Symptom Score (KSS –from the validated, patient-administered DHAF) was the average on a 0-10 scale (0=None, 10=Very Severe) of 5 separate scales — rash, feeling of fever/chills, joint pain, eye redness/pain, and fatigue). Subjects all received rilonacept 160 mg from week 6 through week 14. At week 15, subjects were re-randomized in a 1:1 ratio between Placebo and rilonacept 160 mg. Subjects baseline period was the 21-day period prior to week 15 randomization. A positive score indicated a worsening of symptoms versus an active treatment rilonacept baseline period.
Participating in This Clinical Trial
Gender Eligibility: All
Minimum Age: 7 Years
Maximum Age: N/A
Are Healthy Volunteers Accepted: No
- Lead Sponsor
- Regeneron Pharmaceuticals
- Provider of Information About this Clinical Study
- Overall Official(s)
- Robert Evans, PharmD., Study Director, Regeneron Pharmaceuticals
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