26.3% (study US301). After 12 months with active treatment, the ACR response rates in leflunomide patients were 52.3% (studies MN301/ 303), 50.5% (study MN302) and 49.4% (study US301), compared to 53.8% (studies MN301/ 303) in sulphasalazine patients, 64.8% (study MN302), and 43.9% (study US301) in methotrexate patients.