- Prior Disease Modifying Antirheumatic Drug (DMARD) therapy: a) Subjects not on methotrexate at baseline must remain without methotrexate throughout the study. Subjects on prior Methotrexate (MTX) must have discontinued at least 28 days prior to Week 0 (Day 1). b) Subjects on Disease Modifying Antirheumatic Drug (DMARD) therapy other than Methotrexate (MTX) (except prednisone/prednisolone less than or equal to 10 mg) must discontinue it for at least 28 days before the first dose of investigational product at Week 0 (Day 1).