This is a randomized, double-blind, parallel group, multicenter clinical study to evaluate the efficacy, safety, pharmacokinetics and immunogenicity of LBAL compared to Humira® in subjects with active Rheumatoid Arthritis despite Methotrexate therapy.

Inclusion Criteria:

• Male or Female patients from 20 years to 75 years of age when signing Informed Consent.
• Diagnosed as having RA (Rheumatoid Arthritis) according to the revised 1987 ACR (American College of Rheumatology) criteria for at least 3 months prior to screening
• Patients who have inadequate response to MTX administered for at least 12 weeks before the beginning of screening period and on a stable dose.

Exclusion Criteria:

• patients with active tuberculosis or latent tuberculosis based on current clinical symptoms, chest X-ray test and IFN-γ release assay at screening
• patients with any of the following concomitant diseases and/or history within 24 weeks before the first administration of investigational products in this study; Serious infectious disease, Opportunistic infection, Chronic or recurrent infectious disease
• patients with any seropositive result for hepatitis B or hepatitis C or HIV
• patients who have any of the following diseases; Sepsis, Demyelinating disorders, Lymphoproliferative disease, Infection with prosthetic joint, Autoimmune diseases other than rheumatoid arthritis