Real-world Drug Survival of Biosimilar SB5 vs GP2017 Following a Mandatory Non-medical Switch from Adalimumab Originator for Psoriasis: A Nationwide Cohort Study

Biosimilars are designed to be analogous to the biologic originators. However, comprehensive comparisons between biosimilars are limited and lacking for patients with psoriasis. This study's objective was to compare 1-year drug survival of the 2 adalimumab biosimilars, GP2017 with SB5, following a non-medical mandatory switch from the adalimumab originator. Based on the national clinical database DERMBIO, this nationwide cohort study included all patients with psoriasis treated with the adalimumab originator who underwent a non-medical mandatory switch to GP2017 or SB5. The study included 525 patients switching from adalimumab originator to 1 of 2 biosimilars: GP2017 (n=267 patients) or SB5 (n=258 patients). When comparing the drug survival of the biosimilars, the hazard ratio was 1.11 (95% confidence interval, 0.58-2.12) for SB5 with GP2017 as reference. In the sensitivity analysis investigating changes in PASI, no differences were found when comparing the GP2017 group and the SB5 group at 120 days of follow-up (1.9% vs 1.6% improved, 1.9% vs 2.0% worsened, and 43.1% vs 40.9% remained unchanged). When comparing GP2017 and SB5, no discernible differences were found in drug survival or effectiveness based on PASI. Determining drug survival and effectiveness could benefit patients and clinicians in treatment decisions.