Research Studies

Patients are eligible to enroll in the study if all of the following criteria are met: 1) Provide written informed consent. 2) Male or female aged ≥18 and ≤80 years at the time of signing the informed consent for entry. 3) Baseline endoscopic biopsy with ≥30 eosinophils/hpf in 5 hpf in the stomach and/or ≥30 eosinophils/hpf in 3 hpf in the duodenum, as determined by central histology assessment of biopsies collected during the screening EGD, without any other significant cause for the eosinophilia. Prior EGD may be used for eligibility as long as the EGD occurred within 30 days of the first screening visit for the AK002-016 study and was performed and centrally assessed as for the AK002-016 study. 4) Completion of at least 4 daily PRO questionnaires per week for a minimum of 3 weeks during screening. 5) A weekly average score of abdominal pain, nausea, or diarrhea ≥3 on the PRO questionnaire (score from 0–10) and a weekly average TSS of ≥10 for at least 2 weeks of screening. 6) Patients with inadequate or loss of response to, or who were intolerant to standard therapies for EG/EoD symptoms, which could include PPI, antihistamines, systemic or topical corticosteroids, and/or diet, among others. 7) If patient is on pre-existing dietary restrictions, willingness to maintain dietary restrictions throughout the study. 8) Willing and able to comply with all study procedures and visit schedule including follow-up visits.

Patients will be excluded from the study if they meet any of the following criteria: 1) Use of systemic or topical corticosteroids exceeding the equivalent of 10 mg/day of prednisone within 4 weeks prior to the screening visit. 2) Change in the dose of corticosteroids (systemic or topical), PPI, leukotrienes, or diet therapy within 4 weeks prior to the screening visit. 3) Treatment with any immunosuppressive or immunomodulatory drugs that may interfere with the study within 12 weeks prior to the screening visit. 4) Prior exposure to AK002 or known hypersensitivity to any constituent of the study drug. 5) Active Helicobacter pylori infection, unless treated and confirmed to be negative by repeat EGD prior to randomization and symptoms remain consistent. 6) History of inflammatory bowel disease, celiac disease, achalasia, or esophageal surgery. 7) History of bleeding disorders and/or esophageal varices. 8) Other causes of gastric and/or duodenal eosinophilia or eosinophilic granulomatosis with polyangiitis (EGPA). 9) Confirmed diagnosis of Hypereosinophilic Syndrome (HES). 10) Women who are pregnant, breastfeeding, or planning to become pregnant while participating in the study. 11) Presence of an abnormal laboratory value considered to be clinically significant by the Investigator. 12) Any disease, condition (medical or surgical), or cardiac abnormality, which, in the opinion of the Investigator, would place the patient at increased risk. 13) History of malignancy, except carcinoma in situ, early stage prostate cancer, or non-melanoma skin cancers. However, cancers that have been in remission for more than 5 years and are considered cured, can be enrolled. 14) Treatment for a clinically significant helminthic parasitic infection within 6 months of screening. 15) Positive helminthic infection on Ova and Parasite (O&P) test. 16) Seropositive for Strongyloides stercoralis at screening, except for patients with past but resolved infection. 17) Seropositive for HIV or hepatitis at screening, except for vaccinated patients or patients with past but resolved hepatitis, at screening. 18) Vaccination with live attenuated vaccines within 30 days prior to initiation of treatment in the study, during the treatment period, or vaccination expected within 5 half-lives (4 months) of study drug administration. 19) Participation in a concurrent interventional study with the last intervention occurring within 30 days prior to study drug administration (or 90 days or 5 half-lives, whichever is longer, for biologic products). 20) Known history of alcohol, drug, or other substance abuse or dependence that is considered by the Investigator to be ongoing and clinically significant. 21) Any other reason that in the opinion of the Investigator or the Medical Monitor makes the patient unsuitable for enrollment. In general, study drug will be infused through a peripheral vein IV set. The IV line will be kept open before and after the infusion with sufficient quantities of 0.9% NaCl to assure patency. A volume of 100 mL* of the calculated dose of study drug will be infused over at least 4 hours on Study Day 1, over at least 3 hours on Study Day 29 (?3), and over at least 2 hours on Study Days 57 (?3), 85 (?3), 113 (?3), and 141 (?3). If the infusion is slowed or interrupted, the time may be extended longer than 4 hours, as long as it does not exceed 8 hours.