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. We plan to disclose detailed data from this Phase 1 trial at two medical conferences during the first quarter of 2017. We have cleared an Investigational New Drug application, or IND, with the U.S. Food and Drug Administration, or FDA, and a Clinical Trial Authorisation, or CTA, with the U.K. Medicines and Healthcare Products Regulatory Agency, or MHRA, to initiate Phase 2a trials of ANB020 in patients with severe adult peanut allergy and moderate-to-severe adult atopic dermatitis, respectively, each of which are anticipated to be initiated during the first quarter of 2017. We anticipate top-line data from these trials to be announced during the second half of 2017. In addition, we plan to seek regulatory clearance during the first half of 2017 to initiate a Phase 2a trial in patients with severe adult eosinophilic asthma, and we anticipate top-line data from this trial 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.