Results from the AMBITION study (Actemra versus Methotrexate double-Blind Investigate Trial In mONotherapy), showed the continuing efficacy and safety of tocilizumab up to 264 weeks.AMBITION was a 24-week randomised controlled trial in patients with active RA who were either MTX-naïve or MTX-free for 6 months prior to study entry. Patients received TCZ 8 mg/kg IV Q4W or oral MTX weekly (7.5 mg dose escalating to 20 mg). For those patients who then entered the long-term extension (LTE) study (N=1...