title: Efficacy and safety of ustekinumab in patients with active psoriatic arthritis: 1 year results of the phase 3, multicentre, double-blind, placebo-controlled PSUMMIT 1 trial.
abstract: BACKGROUND
  Many patients with psoriasis develop psoriatic arthritis, a chronic inflammatory disease that afflicts peripheral synovial, axial, and entheseal structures. The fully human monoclonal antibody ustekinumab is an efficacious treatment for moderate-to-severe plaque psoriasis. We did a randomised, placebo-controlled, phase 3 trial to assess the safety and efficacy of ustekinumab in patients with active psoriatic arthritis.
  
  
  METHODS
  In this phase 3, multicentre, double-blind, placebo-controlled trial at 104 sites in Europe, North America, and Asia-Pacific, adults with active psoriatic arthritis (≥5 tender and ≥5 swollen joints, C-reactive protein ≥3·0 mg/L) were randomly assigned (1:1:1, by dynamic central randomisation based on an algorithm implemented by an interactive voice-web response system) to 45 mg ustekinumab, 90 mg ustekinumab, or placebo at week 0, week 4, and every 12 weeks thereafter. At week 16, patients with less than 5% improvement in both tender and swollen joint counts entered masked early-escape and were given 45 mg ustekinumab (if in the placebo group) or 90 mg ustekinumab (if in the 45 mg group). At week 24, all remaining patients in the placebo group received ustekinumab 45 mg, which they continued at week 28 and every 12 weeks thereafter. Our primary endpoint was 20% or greater improvement in American College of Rheumatology (ACR20) criteria at week 24. This trial is registered with ClinicalTrials.gov (NCT01009086) and EudraCT (2009-012264-14).
  
  
  RESULTS
  Between Nov 30, 2009, and March 30, 2011, 615 patients were randomly assigned-206 to placebo, 205 to 45 mg ustekinumab, and 204 to 90 mg ustekinumab. More ustekinumab-treated (87 of 205 [42·4%] in the 45 mg group and 101 of 204 [49·5%] in the 90 mg group) than placebo-treated (47 of 206 [22·8%]) patients achieved ACR20 at week 24 (p<0·0001 for both comparisons); responses were maintained at week 52. At week 16, proportions of patients with adverse events were similar in the ustekinumab and placebo groups (171 of 409 [41·8%] vs 86 of 205 [42·0%]).
  
  
  CONCLUSIONS
  Ustekinumab significantly improved active psoriatic arthritis compared with placebo, and might offer an alternative therapeutic mechanism of action to approved biological treatments.
  
  
  BACKGROUND
  Janssen Research & Development.
authors.affiliation: Glasgow Biomedical Research Centre, University of Glasgow, Glasgow, UK. iain.mcinnes@glasgow.ac.uk
authors.forename: Iain B
authors.initials: IB
authors.lastname: McInnes
authors.forename: Arthur
authors.initials: A
authors.lastname: Kavanaugh
authors.forename: Alice B
authors.initials: AB
authors.lastname: Gottlieb
authors.forename: Lluís
authors.initials: L
authors.lastname: Puig
authors.forename: Proton
authors.initials: P
authors.lastname: Rahman
authors.forename: Christopher
authors.initials: C
authors.lastname: Ritchlin
authors.forename: Carrie
authors.initials: C
authors.lastname: Brodmerkel
authors.forename: Shu
authors.initials: S
authors.lastname: Li
authors.forename: Yuhua
authors.initials: Y
authors.lastname: Wang
authors.forename: Alan M
authors.initials: AM
authors.lastname: Mendelsohn
authors.forename: Mittie K
authors.initials: MK
authors.lastname: Doyle
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D061067:Antibodies, Monoclonal, Humanized / Q000009:adverse effects / Q000627:therapeutic use*; D015535:Arthritis, Psoriatic / Q000188:drug therapy*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D016896:Treatment Outcome; D000069549:Ustekinumab; D055815:Young Adult
chemical_list: D061067:Antibodies, Monoclonal, Humanized; D000069549:Ustekinumab