A Study to Evaluate the Long-term Safety and Efficacy of LBEC0101 in Subjects With Active RA Despite Methotrexate (MTX)

Inclusion Criteria: * Patients who completed the treatment period of Study LG-ECCL002 * Patients requiring continuous treatment for rheumatoid arthritis upon the investigator's discretion * For childbearing female patients or surgically non-sterile male patients, those who agreed to avoid pregnancy using proper contraceptive methods during the study. * Patients who made a voluntary decision to participate in this clinical study and gave a voluntary written consent to comply with all the instructions with full understanding after being informed of the study Exclusion Criteria: * Patients deemed difficult to participate in this extension study due to the adverse events which occurred in Study LG-ECCL002, upon the investigator's discretion at screening * Patients with at least 10 swollen joints (out of the total 66 assessing joints) or at least 12 tender joints (out of the total 68 assessing joints) at screening * Women in pregnancy or lactation, or patients planning to be pregnant during the study period * Patients ineligible for this clinical study upon the investigator's discretion