ESR1 and neutropenia: To prevent unblinding due to expected rapid normalization of inflammatory markers or the occurrence of specific laboratory abnormalities sometimes observed during TCZ therapy (e.g., neutropenia, transaminase elevation), a safety assessor independent of the investigator/efficacy assessor will monitor the results of the following laboratory parameters: ESR, CRP, total white blood cell count (WBC), absolute neutrophil count (ANC), platelet counts, and aspartate aminotransferase (AST) and alanine aminotransferase (ALT) concentrations.