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Objective: The role of rheumatoid factor (RF) and anti-cyclic citrullinated peptide antibodies (anti-CCP) in the response to treatment for rheumatoid arthritis (RA) such as tocilizumab (TCZ) is still not completely understood. This study investigates the relationship between the presence and levels of RF and anti-CCP and clinical response to TCZ in patients with RA. Methods: This was an observational longitudinal study in 27 patients with active, long-standing RA despite previous treatment with >2 Disease-Modifying Anti Rheumatic Drugs (DMARDs) and/or steroids. Patients were treated with TCZ 8 mg/kg every 4 weeks.