title: Safety of the selective costimulation modulator abatacept in rheumatoid arthritis patients receiving background biologic and nonbiologic disease-modifying antirheumatic drugs: A one-year randomized, placebo-controlled study.
abstract: OBJECTIVE
  To assess the safety of abatacept, a selective costimulation modulator, in patients with active rheumatoid arthritis (RA) who had been receiving > or =1 traditional nonbiologic and/or biologic disease-modifying antirheumatic drugs (DMARDs) approved for the treatment of RA for at least 3 months prior to entry into the study.
  
  
  METHODS
  This was a 1-year, multicenter, randomized, double-blind, placebo-controlled trial. Patients were randomized 2:1 to receive abatacept at a fixed dose approximating 10 mg/kg by weight range, or placebo.
  
  
  RESULTS
  The abatacept and placebo groups exhibited similar frequencies of adverse events (90% and 87%, respectively), serious adverse events (13% and 12%, respectively), and discontinuations due to adverse events (5% and 4%, respectively). Five patients (0.5%) in the abatacept group and 4 patients (0.8%) in the placebo group died during the study. Serious infections were more frequent in the abatacept group than in the placebo group (2.9% versus 1.9%). Fewer than 4% of patients in either group experienced a severe or very severe infection. The incidence of neoplasms was 3.5% in both groups. When evaluated according to background therapy, serious adverse events occurred more frequently in the subgroup receiving abatacept plus a biologic agent (22.3%) than in the other subgroups (11.7-12.5%).
  
  
  CONCLUSIONS
  Abatacept in combination with synthetic DMARDs was well tolerated and improved physical function and physician- and patient-reported disease outcomes. However, abatacept in combination with biologic background therapies was associated with an increase in the rate of serious adverse events. Therefore, abatacept is not recommended for use in combination with biologic therapy.
authors.affiliation: Rheumatology and Immunology, Brigham and Women's Hospital, Boston, Massachusetts 02115, USA. mweinblatt@partners.org
authors.forename: M
authors.initials: M
authors.lastname: Weinblatt
authors.forename: B
authors.initials: B
authors.lastname: Combe
authors.forename: A
authors.initials: A
authors.lastname: Covucci
authors.forename: R
authors.initials: R
authors.lastname: Aranda
authors.forename: J C
authors.initials: JC
authors.lastname: Becker
authors.forename: E
authors.initials: E
authors.lastname: Keystone
mesh_terms: D000069594:Abatacept; D000328:Adult; D000368:Aged; D018501:Antirheumatic Agents / Q000627:therapeutic use*; D001172:Arthritis, Rheumatoid / Q000188:drug therapy* / Q000503:physiopathology; D004311:Double-Blind Method; D004359:Drug Therapy, Combination; D005260:Female; D006801:Humans; D018796:Immunoconjugates / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D010146:Pain / Q000453:epidemiology; D010919:Placebos
chemical_list: D018501:Antirheumatic Agents; D018796:Immunoconjugates; D010919:Placebos; D000069594:Abatacept