Safety Study of a Single Dose of REGN88(SAR153191)in Patients With Rheumatoid Arthritis

Inclusion Criteria:

1. Male or female ≥ 18 years of age

2. Subjects must weigh > 50 kg and < 100 kg

3. Diagnosis of Rheumatoid Arthritis (RA) as defined by the 1987 revised American College of Rheumatology (ACR) criteria with disease duration of no less than 6 months and ACR class I-III

4. For women of childbearing potential, a negative serum pregnancy test at the Screening Visit (Visit 1) and a negative urine pregnancy test at Day -1

5. For men and women of childbearing potential, willingness to utilize adequate contraception and not become pregnant (or have their partner[s] become pregnant) during the full course of the study.

Exclusion Criteria:

1. A history of Listeriosis or active tuberculosis (TB)

2. Persistent chronic or active recurring infection requiring treatment with antibiotics, antivirals, or antifungals within 4 weeks prior to the Screening Visit

3. History of prior articular or prosthetic joint infection

4. History of a hypersensitivity reaction, other than localized injection site reaction (ISR), to any biological molecule

5. Significant concomitant illness such as, but not limited to cardiac, renal, neurological, endocrinological, metabolic or lymphatic disease that would adversely affect the subject's participation in this study

6. Received administration of any live (attenuated) vaccine within 3 months prior to the Screening Visit