Differences in biologic dose-escalation, non-biologic and steroid intensification among three anti-TNF agents: evidence from clinical practice

Clin Exp Rheumatol. Jan-Feb 2011;29(1):26-34. Epub 2011 Feb 23.

Abstract

Objectives: To evaluate prevalence of dose escalation among RA patients in normal clinical practice treated with etanercept, adalimumab or infliximab and to estimate its economic impact.

Methods: A retrospective observational study of 739 patients with RA receiving continuous treatment with etanercept (n=319), adalimumab (n=313) or infliximab (n=107) for 18 months. Dose escalation, intensification of concomitant DMARDs and risk of dose escalation were evaluated, as well as costs.

Results: Significantly more patients prescribed adalimumab (10%, p<0.001) or infliximab (35%, p<0.001) experienced dose escalation compared with patients treated with etanercept (3%). DMARD or steroid dose adjustment, when added as criteria of escalation, occurred more often among patients treated with adalimumab (28%; p=0.022) or infliximab (47%; p<0.001) than those prescribed etanercept (19%). Independent of confounding covariates, hazard of dose escalation was significantly higher for either infliximab (28.1-fold) or adalimumab (4.9-fold) relative to etanercept. Escalation among subjects treated with either infliximab or adalimumab incurred statistically significant increases in total cost of care compared with non-escalators whereas such differences observed for subjects treated with etanercept were not significant.

Conclusions: Patients receiving monoclonal antibody therapies, adalimumab or infliximab, had significantly higher rates of dose escalation than patients receiving the soluble TNF receptor, etanercept, and related costs were higher.

Publication types

  • Comparative Study
  • Multicenter Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adalimumab
  • Antibodies, Monoclonal / administration & dosage*
  • Antibodies, Monoclonal, Humanized
  • Antirheumatic Agents / administration & dosage
  • Antirheumatic Agents / therapeutic use*
  • Arthritis, Rheumatoid / drug therapy*
  • Arthritis, Rheumatoid / physiopathology
  • Dose-Response Relationship, Drug
  • Drug Administration Schedule
  • Drug Dosage Calculations
  • Etanercept
  • Female
  • Health Status
  • Humans
  • Immunoglobulin G / administration & dosage*
  • Infliximab
  • Male
  • Middle Aged
  • Receptors, Tumor Necrosis Factor / administration & dosage*
  • Severity of Illness Index
  • Tumor Necrosis Factor-alpha / antagonists & inhibitors*

Substances

  • Antibodies, Monoclonal
  • Antibodies, Monoclonal, Humanized
  • Antirheumatic Agents
  • Immunoglobulin G
  • Receptors, Tumor Necrosis Factor
  • Tumor Necrosis Factor-alpha
  • Infliximab
  • Adalimumab
  • Etanercept