Sanofi (SNY), Regeneron (REGN) Update on Two Phase 1b Dupilumab Trials

March 4, 2013 6:56 AM EST
Sanofi (NYSE: SNY) and Regeneron Pharmaceuticals, Inc. (Nasdaq: REGN) announced that pooled data from two Phase 1b trials with dupilumab (REGN668/SAR231893), an investigational, high-affinity, subcutaneously administered, fully-human antibody targeting the alpha subunit of the interleukin 4 receptor (IL-4R alpha), were presented at the 71st Annual Meeting of the American Academy of Dermatology (AAD) in Miami.

The primary objective of the Phase 1b studies was to assess the safety profile of dupilumab. Other exploratory endpoints included pharmacokinetic, biomarker, and efficacy parameters. The efficacy data showed that treatment with four weekly subcutaneous injections of dupilumab at either 150 milligrams (mg) or 300mg per week, significantly improved the signs and symptoms of patients with moderate-to-severe atopic dermatitis (AD) whose disease was not adequately controlled with topical medications. Specifically, patients treated with dupilumab had significant improvements in body surface area (BSA) score, Investigator Global Assessment (IGA) score, and Eczema Area Severity Index (EASI) from baseline to week 4 compared to placebo (p<0.05 vs. placebo for all measures and doses). The significant improvements in BSA, IGA, and EASI scores were maintained at week 8 in the 300mg dose group (p<0.05 vs. placebo). A responder analysis demonstrated that at week 4, 54.5% of patients treated with the 150mg dose and 71.4% of patients treated with the 300mg dose achieved a reduction in EASI score of 50% or greater compared to 18.8% with placebo (p<0.05). The most common adverse events (AEs) were nasopharyngitis (19.6% vs 12.5% for placebo) and headache (11.8% vs 6.3% for placebo).

Presented today in a late-breaking clinical trials session at the AAD meeting, the Phase 1b trials included 67 patients randomized to three different doses of dupilumab (75mg, n=8; 150mg, n=22; 300mg, n=21) and placebo (n=16). The primary objective of the Phase 1b studies was to assess the safety profile of dupilumab. Other endpoints included pharmacokinetic, biomarker, and efficacy parameters. Following the 4-week treatment period, patients in the studies were followed for an additional 4 weeks for a total of 8 weeks.

About IL-4R and the IL-4/IL-13 Pathway: Atopic dermatitis and some types of asthma are characterized by the induction of a specific type of an immune response that is driven by a subset of immune cells called Type 2 helper T cells, or Th2 cells. IL-4 and IL-13 are key cytokines that are required for the initiation and maintenance of this Th2 immune response. Both IL-4 and IL-13 signaling occurs through two different IL-4 receptors (Type I and II), which both contain a common IL-4R alpha subunit.

About Dupilumab (SAR231893/REGN668): Dupilumab is a fully human monoclonal antibody directed against IL-4R alpha and is administered via subcutaneous injection. By blocking IL-4R alpha dupilumab modulates signaling of both IL-4 and IL-13, drivers of a Th2 immune response. Dupilumab was created using Regeneron's pioneering VelocImmune® technology and is being co-developed with Sanofi. Dupilumab is currently being studied in both atopic dermatitis and asthma.

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