A Study to Evaluate the Safety and Tolerability of Multiple Doses of Gerilimzumab in Rheumatoid Arthritis Patients

The primary objective of this study is to evaluate the safety, tolerability and pharmacokinetic (PK) profiles of multiple abdominal subcutaneous injection of GB224 in combination with oral methotrexate in Chinese patients with moderate and severe active rheumatoid arthritis in two dose groups; the secondary objectives are to preliminarily evaluate the clinical efficacy such as ACR20 at week 32, ACR20, ACR50 and ACR70 at weeks 12 and 24, ACR50 and ACR70 at week 32, and DAS28 at weeks 12, 24 and 32 of multiple abdominal subcutaneous injection of GB224 in combination with oral methotrexate in Chinese patients with moderate and severe active rheumatoid arthritis in two dose groups as well as to preliminarily understand the immunogenicity and changes in pharmacodynamic variable (IL-6) of multiple abdominal subcutaneous injection of GB224 in combination with oral methotrexate in Chinese patients with moderate and severe active rheumatoid arthritis in two dose groups.