title: Longterm observational study of methotrexate use in a Dutch cohort of 1022 patients with rheumatoid arthritis.
abstract: OBJECTIVE
  To study which factors are associated with longterm methotrexate (MTX) use in rheumatoid arthritis (RA).
  
  
  METHODS
  All patients with RA who had started MTX after January 1, 1993, were selected from a regional hospital based registration system. Data on demographic and clinical features were retrieved through chart review. By means of life table analysis and Cox regression analysis, MTX survival and the relation between demographic variables, clinical features, and MTX survival were studied.
  
  
  RESULTS
  A total of 1072 MTX treatment episodes in 1022 patients were analyzed. The cumulative MTX survival probability after 5 years was 64%, and after 9 years was 50%. Univariate analysis showed a significant relation between MTX survival probability and folic acid supplementation, attending rheumatologist, concurrent prednisolone use, concurrent sulfasalazine use, and the number of previous disease modifying drugs. In the multivariate analysis folic acid supplementation, attending rheumatologist, and concurrent prednisolone use remained significantly related to MTX survival. Age, disease duration, and creatinine clearance were not.
  
  
  CONCLUSIONS
  In this retrospective study of 1022 patients with RA the cumulative MTX survival probability was 64% after 5 years and 50% after 9 years. Folic acid supplementation and to a lesser extent prednisolone were associated with a longer MTX survival. In addition, treatment strategies of individual rheumatologists influenced MTX survival.
authors.affiliation: Department of Rheumatology, Medisch Spectrum Twente-Enschede, PO Box 5000, 7500 KA Enschede, The Netherlands. m.hoekstra@ziekenhuis-mst.nl
authors.forename: Monique
authors.initials: M
authors.lastname: Hoekstra
authors.forename: Mart A F J
authors.initials: MA
authors.lastname: van de Laar
authors.forename: Hein J
authors.initials: HJ
authors.lastname: Bernelot Moens
authors.forename: Marijn W M
authors.initials: MW
authors.lastname: Kruijsen
authors.forename: Cees J
authors.initials: CJ
authors.lastname: Haagsma
mesh_terms: D000893:Anti-Inflammatory Agents / Q000627:therapeutic use; D018501:Antirheumatic Agents / Q000627:therapeutic use*; D001172:Arthritis, Rheumatoid / Q000188:drug therapy*; D015331:Cohort Studies; D004359:Drug Therapy, Combination; D005260:Female; D005492:Folic Acid / Q000627:therapeutic use; D006801:Humans; D015993:Life Tables; D008137:Longitudinal Studies; D008297:Male; D008727:Methotrexate / Q000627:therapeutic use*; D008875:Middle Aged; D015999:Multivariate Analysis; D010820:Physicians; D011239:Prednisolone / Q000627:therapeutic use; D016016:Proportional Hazards Models; D012189:Retrospective Studies; D012219:Rheumatology / Q000379:methods; D012460:Sulfasalazine / Q000627:therapeutic use; D016019:Survival Analysis
chemical_list: D000893:Anti-Inflammatory Agents; D018501:Antirheumatic Agents; D012460:Sulfasalazine; D005492:Folic Acid; D011239:Prednisolone; D008727:Methotrexate