Objective: To investigate the efficacy and safety of ABT-874, an interleukin 12/23 monoclonal antibody, in psoriasis. Design: Phase 2, 12-week, multicenter, randomized, double-blind, placebo-controlled trial. Setting: Outpatient dermatology clinics. Patients: One hundred eighty patients with clinically stable moderate to severe chronic plaque psoriasis. Interventions: Patients were randomized in groups of 30 to receive 1 of 6 treatments with ABT-874 provided as a subcutaneous injection: one 200-mg dose at week 0; 100 mg every other week for 12 weeks; 200 mg weekly for 4 weeks; 200 mg every other week for 12 weeks; 200 mg weekly for 12 weeks; or placebo. Main Outcome Measure: At least a 75% reduction in the Psoriasis Area and Severity Index. Results: The percentage of patients achieving a 75% reduction in the Psoriasis Area and Severity Index at week 12 was statistically significantly greater in all of the ABT-874 treatment groups than in the placebo group (200 mg once, 63% [19 of 30]; 100 mg every other week for 12 weeks, 93% [28 of 30]; 200 mg weekly for 4 weeks, 90% [27 of 30]; 200 mg every other week for 12 weeks, 93% [28 of 30]; 200 mg weekly for 12 weeks, 90% [27 of 30]; placebo, 3% [1 of 30]; P<.001). Treatment with ABT-874 was well tolerated. The most common adverse event was injection-site reaction, and the most common infectious adverse events were nasopharyngitis and upper respiratory tract infection. There were no serious infectious adverse events. Conclusions: ABT-874, an interleukin 12/23 monoclonal antibody, was highly effective and well tolerated in the treatment of psoriasis. Longer-term studies are required to confirm these findings. Trial Registration: clinicaltrials.gov Identifier: NCT00292396.
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