To assess the effectiveness, safety and cost of Etanercept biosimilar in patients with rheumatoid arthritis (RA), spondyloarthritis (SpA) and psoriatic arthritis (PsA) compared to the standard drug in real clinical practice.
Retrospective observational study. Case series of 138 patients with RA, SpA or PsA treated with at least one dose of Benepali® (n = 79) or Enbrel® (n = 59). Drug retention time was the primary efficacy endpoint compared to the biosimilar and the original. The proportion of patients achieving low disease activity or remission after 52 weeks was used as the secondary outcome. Safety was assessed by means of the adverse effects incidence rate. A cost minimization analysis was performed.
No differences were observed regarding treatment retention time between drugs (median [95% confidence interval, 95% CI] at 12.0 months [10.2-12.0] for the biosimilar and 12.0 months [12.0-12.0] for the original). Similar improvements, in terms of inflammatory activity and physical function, were obtained after 52 weeks except for patients with SpA and PsA who, in general, experienced improvements of BASDAI and ASDAS with the original compared with the biosimilar. No significant differences were observed in the total number of adverse effects (.43 events/patient-years versus the biosimilar and .53 versus the original). Using the biosimilar in place of the original drug resulted in a net savings of 118,383.55 € (1,747.20 €/patient-years) for the hospital.
The biosimilar Benepali is as effective and safe as the original and much more cost-effective.