title: Treatment continuation in patients receiving biological agents or conventional DMARD therapy.
abstract: OBJECTIVE
  To compare drug continuation rates in patients with rheumatoid arthritis who start on a biological agent and in a control group of patients with a change in disease modifying antirheumatic drug (DMARD) treatment after previous DMARD failure.
  
  
  METHODS
  Patients with rheumatoid arthritis enrolled in the German biologics register between May 2001 and September 2003 were included in the study. Data were available for 511 patients treated with etanercept, 343 with infliximab, 70 with anakinra, and 599 controls. Propensity scores were used to select a subsample of patients from the control group who were likely to be treated with biological agents because of their disease severity, as well as comparable infliximab and etanercept cases.
  
  
  RESULTS
  Treatment continuation after 12 months was similar for etanercept (68.6% (95% confidence interval, 62% to 75%)) and infliximab (65.4% (58% to 73%)) but lower for anakinra (59% (41% to 77%)). Treatment continuation was more likely for patients on combinations of biological agents and DMARDs than for those on infliximab or etanercept alone. Patients treated with biological agents were more severely ill than those in the control group and had more previous DMARD failures. After adjustment for baseline differences, the continuation rates were higher in patients treated with biological agents than in comparable control patients treated with leflunomide or leflunomide/methotrexate.
  
  
  CONCLUSIONS
  Treatment continuation of biological agents in clinical practice is less likely than in randomised clinical trials but more likely than in comparable controls treated with conventional DMARDs.
authors.affiliation: German Rheumatism Research Centre, Berlin, Germany. Zink@DRFZ.de
authors.forename: A
authors.initials: A
authors.lastname: Zink
authors.forename: J
authors.initials: J
authors.lastname: Listing
authors.forename: S
authors.initials: S
authors.lastname: Kary
authors.forename: P
authors.initials: P
authors.lastname: Ramlau
authors.forename: M
authors.initials: M
authors.lastname: Stoyanova-Scholz
authors.forename: K
authors.initials: K
authors.lastname: Babinsky
authors.forename: U
authors.initials: U
authors.lastname: von Hinueber
authors.forename: E
authors.initials: E
authors.lastname: Gromnica-Ihle
authors.forename: S
authors.initials: S
authors.lastname: Wassenberg
authors.forename: C
authors.initials: C
authors.lastname: Antoni
authors.forename: P
authors.initials: P
authors.lastname: Herzer
authors.forename: J
authors.initials: J
authors.lastname: Kekow
authors.forename: M
authors.initials: M
authors.lastname: Schneider
authors.forename: R
authors.initials: R
authors.lastname: Rau
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000911:Antibodies, Monoclonal / Q000008:administration & dosage; D018501:Antirheumatic Agents / Q000008:administration & dosage*; D001172:Arthritis, Rheumatoid / Q000188:drug therapy*; D004334:Drug Administration Schedule; D011307:Drug Prescriptions / Q000706:statistics & numerical data; D004359:Drug Therapy, Combination; D000068800:Etanercept; D005260:Female; D006801:Humans; D007074:Immunoglobulin G / Q000008:administration & dosage; D007155:Immunologic Factors / Q000008:administration & dosage*; D000069285:Infliximab; D053590:Interleukin 1 Receptor Antagonist Protein; D008297:Male; D008727:Methotrexate / Q000008:administration & dosage; D008875:Middle Aged; D010352:Patient Dropouts / Q000706:statistics & numerical data; D018124:Receptors, Tumor Necrosis Factor / Q000008:administration & dosage; D012042:Registries; D012795:Sialoglycoproteins / Q000008:administration & dosage; D017211:Treatment Failure; D014409:Tumor Necrosis Factor-alpha / Q000037:antagonists & inhibitors
chemical_list: D000911:Antibodies, Monoclonal; D018501:Antirheumatic Agents; C507763:IL1RN protein, human; D007074:Immunoglobulin G; D007155:Immunologic Factors; D053590:Interleukin 1 Receptor Antagonist Protein; D018124:Receptors, Tumor Necrosis Factor; D012795:Sialoglycoproteins; D014409:Tumor Necrosis Factor-alpha; D000069285:Infliximab; D000068800:Etanercept; D008727:Methotrexate