Latiglutenase as a Treatment for Celiac Disease

This is a phase 2, single-center, prospective, randomized, double-blind, placebo-controlled,
study in patients with well-controlled celiac disease. Patients with confirmed CD diagnosis
(biopsy) will be recruited to participate in the study. Informed consent must be obtained
prior to performing any screening procedures. Patients who meet Visit 1 protocol enrollment
criteria will be enrolled and begin the screening period. Patients that fail to meet
screening period eligibility will be discontinued from study participation at Visit 2. At
Visit 2, eligibility will be confirmed, adverse events will be documented at Visit 2.
Patients who continue to meet eligibility requirements at Visit 3 will begin the treatment
phase. During the treatment phase patients will self-administer treatment and gluten daily
with their evening meal. At the end of the treatment period, Visit 4, patient eligibility
will be confirmed and adverse events will be documented. The final visit, Visit 5, will be a
safety follow-up visit.

Inclusion Criteria:

- Biopsy confirmed CD diagnosis

- Self-reported adherence to a gluten-free diet for ≥ 12 months

- Agree to maintain dosing of approved prescribed and OTC medications

- Willing to take study treatment with evening meal during any single day

- Willing to take gluten foodstuff with evening meal during any single day

- Willing to maintain GFD for entire study duration

- Willing to agree to minimal ingestion outside of three main daily meals

- Willing and able to comply with all study procedures

- Access to the internet via smartphone, tablet, computer or equivalent to facilitate
daily symptom reporting

- Must sign informed consent

Exclusion Criteria:

- Active dermatitis herpetiformis at the time of screening

- IBS (Irritable Bowel Syndrome)

- History of any form of colitis

- Received any systemic biologics (such as monoclonal antibodies or other protein
therapeutics where the half-life overlaps with the study start) within 6 months prior
to study start

- Taking any oral probiotic supplements (not including probiotics contained in
commercially available food preparations) 6 months prior to entry

- Use of any immunosuppressive medications (i.e., for chronic treatment of autoimmune
disease or transplant-rejection prophylaxis) 6 months prior to entry

- History of alcohol abuse, illegal drug use

- Unwilling to practice highly effective birth control (unless surgically sterilized or
post-menopausal)

- Received any experimental drug within 30 days of randomization, in the case of
experimental biologics at least 6 months prior to randomization

- Uncontrolled complications of celiac disease, which, in the opinion of the
investigator, could affect immune response or pose an increased risk to the patient

- Inability to give informed consent

- Any medical condition, other than celiac disease, which, in the opinion of the
investigator, could adversely affect the patient's participation in the trial.