Allakos Announces Topline Phase 3 Data from the EoDyssey Study in Patients with Eosinophilic Duodenitis

– Lirentelimab met histologic co-primary endpoint but missed symptomatic co-primary endpoint –

SAN CARLOS, CA, USA I September 09, 2022 I Allakos Inc. (the “Company”) (Nasdaq: ALLK), a biotechnology company developing lirentelimab (AK002) and AK006 for the treatment of allergic and inflammatory diseases, today reported data from EoDyssey, a 24-week, Phase 3, randomized, double-blind, placebo-controlled study of lirentelimab in patients with biopsy confirmed eosinophilic duodenitis (EoD). The trial met its histologic co-primary endpoint, but it did not achieve statistical significance on the patient reported symptomatic co-primary endpoint, in both the intent to treat (ITT) population and in a prespecified subpopulation.

The prespecified subpopulation was based on a post hoc analysis of the Company’s phase 3 ENIGMA2 study and excluded certain patients with conditions that could confound the patient reported symptomatic endpoint (e.g., non-eosinophilic/non-mast cell driven esophageal disorders or active irritable bowel syndrome). Although positive numerical trends in the symptomatic endpoint were observed in this prespecified subpopulation, the results were not statistically significant.

The safety results of the trial were generally consistent with previously reported intravenous lirentelimab studies. Mild to moderate infusion-related reactions (including flushing, feeling of warmth, headache, nausea, and/or dizziness) occurred in 19.6% of lirentelimab-treated patients and 14.9% of placebo-treated patients.

Currently Allakos is not planning to conduct additional studies in eosinophilic gastrointestinal diseases, but may do so in the future. Allakos is focusing development efforts for lirentelimab in atopic dermatitis and chronic spontaneous urticaria and on AK006.

Allakos Development Programs
Allakos is conducting a Phase 2 randomized, double-blind, placebo-controlled study of subcutaneous lirentelimab in patients with moderate-to-severe atopic dermatitis and a Phase 2b randomized, double-blind, placebo-controlled study of subcutaneous lirentelimab in patients with chronic spontaneous urticaria. The Company anticipates reporting topline data from these studies in the second half of 2023. Additionally, Allakos is advancing AK006, an anti-Siglec-6 antibody that selectively inhibits mast cells, including KIT-mediated signaling, into IND enabling studies and plans to initiate a Phase 1 study in healthy volunteers in the first half of 2023.

EoDyssey Phase 3 Design
The randomized, double-blind, placebo-controlled Phase 3 trial of intravenous lirentelimab enrolled 93 patients with moderate to severe symptoms (based on a patient reported symptom questionnaire) and biopsy-confirmed eosinophilia of the duodenum (≥30 eosinophils/hpf in 3 hpfs) without eosinophilia of the stomach (defined as having less than 30 eosinophils/hpf in 5 hpfs). Patients were randomized 1:1 to receive: 3.0 mg/kg of lirentelimab given monthly or a monthly placebo. Disease symptoms were measured daily using a patient reported symptom questionnaire that scored 6 symptoms (abdominal pain, nausea, bloating, early satiety, abdominal cramping, and loss of appetite) each on a scale from 0 to 10 (TSS). The co-primary endpoints for the Phase 3 study were (1) the proportion of patients achieving histologic response (defined as <15 eosinophils (eos) / high powered field (hpf) in 3 hpfs in the duodenum) and (2) symptomatic improvement as measured by mean absolute change in the six-symptom total symptom score (TSS).

About Allakos
Allakos is a clinical stage biotechnology company developing therapeutics which target immunomodulatory receptors present on immune effector cells involved in allergy, inflammatory and proliferative diseases. Activating these immunomodulatory receptors allows for the direct targeting of cells involved in disease pathogenesis and, in the setting of allergy and inflammation, has the potential to result in broad inhibition of inflammatory cells. The Company’s most advanced antibodies are lirentelimab (AK002) and AK006. Lirentelimab selectively targets both mast cells and eosinophils, two types of white blood cells that are widely distributed in the body and play a central role in the inflammatory response. Inappropriately activated mast cells and eosinophils have been identified as key drivers in a number of severe diseases affecting the gastrointestinal tract, eyes, skin, lungs and other organs. Allakos is developing lirentelimab for the treatment of atopic dermatitis, chronic spontaneous urticaria and potentially additional indications. Lirentelimab has received orphan drug designations for eosinophilic gastritis (EG), EoD, and eosinophilic esophagitis (EoE) from the U.S. Food and Drug Administration. AK006 targets Siglec-6, an inhibitory receptor expressed selectively on mast cells. In pre-clinical research, AK006 appears to provide deeper mast cell inhibition than lirentelimab and, in addition to its inhibitory activity, reduce mast cell numbers. Allakos plans to begin human studies with AK006 in the first half of 2023. For more information, please visit the Company's website at www.allakos.com.

SOURCE: Allakos

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