An Analysis of the Biological Disease-modifying Antirheumatic Drug-free Condition of Adalimumab-treated Rheumatoid Arthritis Patients

Intern Med. 2019 Feb 15;58(4):511-519. doi: 10.2169/internalmedicine.1332-18. Epub 2018 Sep 12.

Abstract

Objectives The present study was performed with the aim of analyzing the biological disease-modifying antirheumatic drug (bDMARD)-free (Bio-free) condition of adalimumab (ADA)-treated rheumatoid arthritis (RA) patients in a real-world setting. Methods ADA was used in the treatment of 130 (male, n=21; female, n=109 females) RA patients. Among them, 26 patients (20.0%) discontinued ADA due to a good response. We analyzed 20 patients who were followed up for more than 6 months after the discontinuation of ADA. The Disease Activity Score 28 based on C-reactive protein (DAS28-CRP) and modified health assessment questionnaires (mHAQs) were evaluated. Results The mean age of the patients was 53.4±11.1 years. The mean disease duration was 4.5±4.3 years. Sixteen patients were bDMARD-naïve, while 4 switched from bDMARDs to ADA. At 6 months after the discontinuation ADA, 19 patients had achieved a clinical remission, and 1 had achieved a low disease activity. The Bio-free period was 26.4±15.5 months. The dose of prednisolone was significantly reduced from baseline (3.45±3.17 mg/day) at 6 months after the discontinuation of ADA (2.63±2.78 mg/day). The dose of methotrexate was unchanged. The number of conventional synthetic DMARDs (csDMARDs) was significantly increased (0.8±0.6 to 1.4±1.06). The mHAQ values were significantly ameliorated by ADA and remained good in patients with a Bio-free condition. A multivariate analysis showed that the dose of methotrexate (MTX) was an important factor for achieving a Bio-free condition. Conclusion A sustainable Bio-free condition in a real clinical setting can be achieved and may be a suitable way of reducing medical costs. The dose of MTX and the additional administration of csDMARDs is therefore thought to be important for ensuring a good outcome in these patients.

Keywords: adalimumab; biologics free condition; conventional synthetic disease-modifying antirheumatic drugs; methotrexate; rheumatoid arthritis.

MeSH terms

  • Adalimumab / therapeutic use*
  • Adult
  • Aged
  • Antibodies, Monoclonal, Humanized / therapeutic use*
  • Antirheumatic Agents / therapeutic use*
  • Arthritis, Rheumatoid / drug therapy*
  • Female
  • Humans
  • Male
  • Methotrexate / therapeutic use*
  • Middle Aged
  • Treatment Outcome

Substances

  • Antibodies, Monoclonal, Humanized
  • Antirheumatic Agents
  • Adalimumab
  • Methotrexate