Evaluating Efficacy and Safety of Etanercept 50 mg Twice Weekly (BIW) in Rheumatoid Arthritis (RA) Subjects Who Are Sub-Optimal Responders to Etanercept 50 mg Once Weekly (QW)

Inclusion Criteria: Diagnosis of Rheumatoid Arthritis RA with a disease duration > 6 months Current and prior but continuous etanercept (50 mg weekly) treatment for at least 5 months prior to screening Subjects must be receiving methotrexate (MTX) at a stable dose > 15 mg/week at least 4 weeks prior to screening Sub-optimal response to etanercept defined by the presence of the following criteria (based on 28 joint count) at screening: 5 or more swollen joints and 5 or more tender joints Subjects who are currently receiving oral corticosteroids must be on a dose equivalent to prednisone less than or equal to 10 mg/day at screening Subjects who are currently receiving non-steroidal anti-inflammatory drugs (NSAIDs), must be on a stable dose for at least 2 weeks prior to screening Subjects who are currently receiving DMARD therapy (including sulfasalazine, hydroxy-chloroquine and leflunomide), must be on a stable dose for at least 4 weeks prior to screening Exclusion Criteria: Nursing mothers, female subjects planning on becoming pregnant, or male subjects planning a pregnancy with their spouse/partner while in the study ACR functional class IV Receipt of any investigational drug or biologic within 4 weeks of study drug initiation Concurrent or history of psychiatric disease that would interfere with ability to comply with study protocol or give informed consent History of alcohol or drug abuse within 12 months of screening visit Severe comorbidities including: History of cancer (other than resected cutaneous basal and squamous cell carcinoma, and in situ cervical cancer) within 5 years of screening visit. Documentation of disease-free state since treatment required; Diagnosis of Class III or IV congestive heart failure (CHF) or myocardial infarction (MI) within 12 months of screening; Unstable or stable angina pectoris; Uncontrolled hypertension (defined as systolic blood pressure measurement of greater than 180 mm Hg or a diastolic blood pressure of greater than 110 mm Hg); Oxygen-dependent pulmonary disease; Known HIV-positive status or other immunodeficiency syndromes; Chronic hepatitis B (HbsAg) or C (HCV); Systemic lupus erythematosus (SLE); CNS demyelinating events suggestive of multiple sclerosis; Presence of active infection or any underlying diseases that could predispose subjects to infection (e.g., history of recurrent infections, non-healing leg ulcers, advanced or poorly controlled diabetes); Active or prior history of tuberculosis (or known exposure). Concurrent treatment with cyclophosphamide