Study to Assess the Safety of REGN668 (SAR231893) Administered Concomitantly With Topical Corticosteroids (TCS) in Patients With Moderate-to-severe Atopic Dermatitis (AD)

Inclusion Criteria:

1. Male and female patients aged 18 years or older
2. Chronic AD that has been present for at least 2 years

Exclusion Criteria:

1. Prior treatment with REGN668 (SAR231893)
2. Hypersensitivity to corticosteroids or to any other ingredients contained by the TCS product used in the study
3. AD lesions located on face, flexural, and genital areas
4. Certain treatments and medical procedures, undertaken within a particular time frame prior to the baseline visit, preclude eligibility for participation in the study
5. Treatment with a live (attenuated) vaccine within 12 weeks before the baseline visit
6. Treatment with an investigational drug within 8 weeks
7. Known history of human immunodeficiency virus (HIV) infection
8. Presence of certain laboratory abnormalities at the screening visit
9. History of certain opportunistic infections or certain clinical parasite infections
10. History of malignancy within 5 years before the baseline visit, with certain exceptions
11. Pregnant or breast-feeding women
12. Travel within 12 months of study start to areas endemic for parasitic infections, such as developing countries in Africa and the tropical and subtropical regions of Asia
13. History of alcohol or drug abuse within 2 years of the screening visit
14. Any medical or psychiatric condition which, in the opinion of the investigator or the sponsor's medical monitor, would place the patient at risk, interfere with participation in the study, or interfere with the interpretation of study results