A Study of Lirentelimab (AK002) in Patients With Active Eosinophilic Duodenitis

  • End date
    Jul 9, 2022
  • participants needed
  • sponsor
    Allakos, Inc.
Updated on 9 September 2021
Craig Paterson, MD
Primary Contact
Allakos Investigational Site (3.8 mi away) Contact
+37 other location


This is a Phase 3, multi-center, randomized, double-blind, placebo-controlled study to assess the efficacy and safety of lirentelimab (AK002) given monthly for 6 doses in adult patients with active eosinophilic duodenitis. Subjects who complete the randomized, double-blind, placebo-controlled treatment may have the option to receive 6 doses of open-label lirentelimab (AK002) through the OLE Period of the study.

Condition Eosinophilic Gastroenteritis, Eosinophilic Duodenitis
Treatment Placebo, AK002
Clinical Study IdentifierNCT04856891
SponsorAllakos, Inc.
Last Modified on9 September 2021


Yes No Not Sure

Inclusion Criteria

Provide written informed consent
Male or female aged 18 and 80 years at the time of signing the informed consent for entry
Baseline endoscopic biopsy with 30 eosinophils/hpf in 3 hpf in the duodenum, as determined by central histology assessment of biopsies collected during the screening EGD + colonoscopy, without any other significant cause for the eosinophilia
Completion of at least 4 daily PRO questionnaires per week for a minimum of 3 weeks during screening
A weekly average score of abdominal pain, nausea, or diarrhea 3 on the PRO questionnaire (score from 0-10) for at least 2 weeks of screening and a weekly average TSS of 10 for at least 2 weeks of screening
Inadequate or loss of response to, or intolerant to standard therapies for EoD symptoms, which could include PPI, antihistamines, systemic or topical corticosteroids, and/or diet, among others
If patient is on pre-existing dietary restrictions, willingness to maintain dietary restrictions throughout the study
Willing and able to comply with all study procedures and visit schedule including follow-up visits
Female patients must be either post-menopausal for at least 1 year with FSH level >30 MIU/mL at screening or surgically sterile (tubal ligation, hysterectomy, or bilateral oophorectomy) for at least 3 months, or if of childbearing potential, have a negative pregnancy test and agree to use dual methods of contraception, or abstain from sexual activity from screening until the end of the study, or for 120 days following the last dose of study drug, whichever is longer. Male patients with female partners of childbearing potential must agree to use a highly effective method of contraception from screening until the end of the study or for 120 days following the last dose of study drug, whichever is longer. All fertile men with female partners of childbearing potential should be instructed to contact the Investigator immediately if they suspect their partner might be pregnant (e.g., missed or later menstrual period) at any time during study participation

Exclusion Criteria

Use of systemic or topical corticosteroids exceeding the equivalent of 10 mg/day prednisone within 4 weeks prior to the screening visit
Baseline endoscopic biopsy with 30 eosinophils/hpf in 5 hpf in the gastric mucosa as determined by central histology assessment of biopsies collected during the screening EGD
Change in the dose of corticosteroids (systemic or topical), PPI, leukotrienes, or diet therapy within 4 weeks prior to the screening visit
Treatment with any immunosuppressive or immunomodulatory drugs that may interfere with the study within 12 weeks prior to the screening visit
Prior exposure to AK002 or known hypersensitivity to any constituent of the study drug
Active Helicobacter pylori infection, unless treated and confirmed to be negative by repeat EGD (for baseline eosinophil count) prior to randomization and symptoms remain consistent
History of inflammatory bowel disease, other chronic inflammatory diseases in the colon (with the exception of eosinophilic colitis), celiac disease, achalasia, or esophageal surgery
History of bleeding disorders and/or esophageal varices
Other causes of duodenal eosinophilia or eosinophilic granulomatosis with polyangiitis
Women who are pregnant, breastfeeding, or planning to become pregnant while participating in the study
Presence of an abnormal laboratory value considered to be clinically significant by the Investigator
Any disease, condition (medical or surgical), or cardiac abnormality, which, in the opinion of the Investigator, would place the patient at increased risk
History of malignancy, except carcinoma in situ, early stage prostate cancer, or non-melanoma skin cancers. However, patients with cancers that have been in remission for more than 5 years and are considered cured can be enrolled
Treatment for a clinically significant helminthic parasitic infection within 6 months of screening
Positive helminthic infection on Ova and Parasite (O&P) test
Seropositive for Strongyloides stercoralis at screening
Seropositive for HIV or hepatitis at screening, except for vaccinated patients or patients with past but resolved hepatitis, at screening
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. This exclusion criterion does not apply to all types and formulations of vaccines (including live attenuated vaccines) authorized by FDA or other regulatory authority for the prevention of COVID-19, which may be administered before, during, or after the study
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)
Known history of alcohol, drug, or other substance abuse or dependence that is considered by the Investigator to be ongoing and clinically significant
Any other reason that in the opinion of the Investigator or the Medical Monitor makes the patient unsuitable for enrollment
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