ANB020 is an antibody that inhibits the activity of interleukin-33, or IL-33, a pro-inflammatory cytokine that multiple studies have indicated is a central mediator of atopic diseases, including asthma, food allergies and atopic dermatitis.
IL-33 acts on several cell types, including white blood cells that initiate and orchestrate atopic responses. IL-33 also directly mediates release of disease-associated cytokines, which recruit pro-inflammatory cells that mediate atopic disease. Because ANB020 inhibits IL-33 function, and acts upstream broadly across the key cell types and cytokines involved in atopy, we believe that its mechanism has advantages in the treatment of atopic diseases over competing agents that block only a subset of the cytokines responsible for atopic diseases.
We have completed a Phase 1 trial of ANB020 in healthy volunteers in Australia under an approved Clinical Trial Notification, or CTN. We believe the results of this Phase 1 trial demonstrate a favorable safety profile of ANB020, which was well-tolerated and for which no dose-limiting toxicities were observed, and favorable pharmacodynamic properties of ANB020, where a single dose was sufficient to suppress IL-33 function for approximately three months post-dosing as measured by an ex vivo pharmacodynamic assay. Data from our Phase 1 Study of ANB020 was presented at the 2017 American Academy of Dermatology (AAD) Annual Meeting and the American Academy of Allergy, Asthma and Immunology (AAAAI) 2017 Annual Meeting (click here to download).
We have completed enrollment of a Phase 2a clinical trial of ANB020 in moderate-to-severe atopic dermatitis, and are currently enrolling patients in a Phase 2a study for severe adult peanut allergy, where top-line data from each trial is anticipated during the second half of 2017. We have received clearance from the U.K. Medicines and Healthcare Products Regulatory Agency to initiate a Phase 2a trial of ANB020 in severe eosinophilic asthma patients, where we anticipate top-line data to be announced during the first half of 2018.
We estimate, based on our analysis of publicly available data sources and interviews with physicians and key opinion leaders in the field, that asthma affects approximately 7.7% of the adult U.S. population, or approximately 19.0 million individuals, of which 19%, or approximately 3.6 million have severe, persistent occurrence of this respiratory disease. Peanut allergy is the most common cause of food-induced allergy in the United States. Based on our analysis, we estimate approximately 1.7 million adults are affected by peanut allergy, of which approximately 600,000 are treated by allergists and approximately 400,000 are at risk for severe reactions and therefore we believe are suitable for treatment with systemic biological therapies.
A translational research study, conducted by the laboratory of Dr. Erik Wambre at the Benaroya Research Institute in collaboration with AnaptysBio, assessed the biology of a distinct subset of T cells, called TH2A cells, which are found in elevated frequency in peanut allergic patients when compared to non-allergic individuals. TH2A cells isolated from peanut allergy patients demonstrated increased sensitivity to IL-33 signaling as a result of elevated expression of the IL-33 receptor. Data showed that, upon stimulus with IL-33, TH2A cells express significantly greater levels of effector cytokines IL-4, IL-5, and IL-13, which are believed to be associated with severe peanut allergy. The research concluded that IL-33 is a key checkpoint of allergic responses, and blocking IL-33 has the potential to reduce expression of the effector cytokines involved in severe peanut allergy. Data from this translational research study was presented at the American Academy of Allergy, Asthma and Immunology (AAAAI) 2017 Annual Meeting (click here to download).
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