This single-arm study evaluated the long-term efficacy and safety of tocilizumab in participants who had completed treatment in the tocilizumab core studies (NCT00106522 [Roche protocol WA18062], NCT00106574 [Roche protocol WA18063], and NCT00109408 [Roche protocol WA17824]) of adults with rheumatoid arthritis. Participants received tocilizumab alone or in combination with standard anti-rheumatic treatment.