A Study of CDX-0159 in Patients With Eosinophilic Esophagitis

Who can take part

• ≥ 18 years of age
• Documented diagnosis of eosinophilic esophagitis (EoE) by endoscopy
• Peak esophageal intraepithelial eosinophil count (PEC) of ≥ 15 per high power field (hpf) from at least 2 of 3 levels (proximal, mid, and distal) of the esophagus
• Symptomatic, defined as • Average of ≥ 2 days per week with dysphagia with solid food intake in the 1 month prior to Screening, and • ≥ 4 days with dysphagia within the last 2 weeks prior to randomization
• On a stable diet which includes solid foods for ≥ 2 months prior to Screening (and throughout the study)
• Inadequate response to or is inappropriate for and/or intolerant to a standard-of-care treatment for EoE (e.g., PPI, swallowed topical corticosteroids, or dietary elimination)
• Willing to be compliant with completion of daily questionnaire

Who cannot take part

• Esophageal dilation within 3 months prior to Screening
• Prior esophageal or gastric surgery that would confound the assessments of EoE
• Regular use of antiplatelet and/or anticoagulant therapy
• Non-biologic systemic agents within 2 months prior to Screening, including but not limited to corticosteroid (oral, swallowed topical or parenteral), non-steroidal immunosuppressants (e.g., methotrexate, cyclosporin, tacrolimus, mycophenolate mofetil, azathioprine), other immunomodulators (e.g., Jak inhibitors, tyrosine kinase inhibitors), and investigational agents
• Oral immunotherapy (OIT) within 6 months prior to Screening
• Sublingual immunotherapy (SLIT) and/or subcutaneous immunotherapy (SCIT) Note: Not exclusionary if patient has been on a stable maintenance dose for at least 6 months prior to Screening
• Receipt of a live vaccine within 2 months prior to the Baseline (Day 1) Visit (patients must agree to avoid live vaccination during study treatment and within 3 months thereafter)
• Prior receipt of barzolvolimab; There may be additional criteria your study doctor will review with you to confirm eligibility
• Diagnosed with hypereosinophilic syndrome or Churg-Strauss syndrome (eosinophilic granulomatosis with polyangiitis)
• History of clinicopathologic diagnosis of eosinophilic gastritis or eosinophilic duodenitis
• Known active Helicobacter pylori infection
• History of coagulation disorders, esophageal varices, achalasia, Crohn's disease, ulcerative colitis, or celiac disease
• Diagnosis of idiopathic anaphylaxis or other severe allergic reactions that in the opinion of the investigator, could increase the patient's risk for systemic hypersensitivity reactions
• Biologic therapy within 5 half-lives (or detectable serum level) prior to Screening, including but not limited to interleukin (IL)-4 receptor inhibitor (dupilumab), IL-5 inhibitors (e.g., mepolizumab, benralizumab), IL-13 inhibitors (e.g., tralokinumab, lebrikizumab), anti-IgE (e.g., omalizumab), IFN-γ inhibitors, or other approved or investigational biologics
• Esophageal stricture that is difficult to pass with a standard adult upper endoscope (9 to 10 mm) or stricture that requires dilation at the Screening EGD
• Avoiding solid foods or using a feeding tube