Efficacy, Safety, and Pharmacokinetic Profiles of REGN3500 Administered to Adult Patients With Moderate-to-Severe Atopic Dermatitis

Key Inclusion Criteria:

1. Chronic AD, according to American Academy of Dermatology Consensus Criteria
(Eichenfield, 2014), that has been present for at least 3 years before the screening
visit

2. Eczema Area and Severity Index (EASI) score ≥16 at the screening and baseline visits

3. IGA score ≥3 (on the 0 to 4 IGA scale, in which 3 is moderate and 4 is severe) at
screening and baseline visits

4. ≥10% Body surface area (BSA) of AD involvement at the screening and baseline visits

5. Documented recent history (within 6 months before the screening visit) of inadequate
response to topical AD medication(s) or for whom topical treatments are medically
inadvisable

Key Exclusion Criteria:

1. Participation in a prior anti-Interleukin (IL)-33 medication clinical study

2. Treatment with an investigational drug within 8 weeks or within 5 half-lives (if
known), whichever is longer, before the baseline visit

3. Having used any of the following treatments within 4 weeks before the baseline visit
or any condition that, in the opinion of the investigator, is likely to require such
treatment(s) during the first 4 weeks of study treatment:

1. Immunosuppressive/immunomodulating drugs (eg, systemic corticosteroids,
cyclosporine, mycophenolate-mofetil, Interferon-gamma (IFN-γ), Janus kinase
inhibitors, azathioprine, methotrexate, etc)

2. Phototherapy for AD

4. Regular use (more than 2 visits per week) of a tanning booth/parlor within 4 weeks of
the baseline visit

5. Treatment with a live (attenuated) vaccine within 12 weeks before the baseline visit

6. Active chronic or acute infection requiring treatment with systemic antibiotics,
antivirals, antiparasitics, antiprotozoals, or antifungals within 2 weeks before the
baseline visit

7. Known or suspected history of immunosuppression

8. History of human immunodeficiency virus (HIV) infection or positive HIV serology at
screening

9. Positive with hepatitis B surface antigen (HBsAg), hepatitis B core antibody (HBcAb),
or hepatitis C virus antibody (HCV Ab) at the screening visit

10. Pregnant or breastfeeding women, or women planning to become pregnant or breastfeed
during the study

Note: Other protocol defined Inclusion/Exclusion Criteria apply