Effect of prior treatment status and reasons for discontinuation on the efficacy and safety of fingolimod vs. interferon β-1a intramuscular: Subgroup analyses of the Trial Assessing Injectable Interferon vs. Fingolimod Oral in Relapsing-Remitting Multiple Sclerosis (TRANSFORMS).

BACKGROUND: Fingolimod demonstrated superior efficacy compared with interferon β-1a intramuscular in relapsing multiple sclerosis. The impact of treatment history on fingolimod efficacy is unknown. OBJECTIVES: This post-hoc analysis of phase 3 TRANSFORMS data compared the efficacy and safety of fingolimod and interferon β-1a intramuscular among patient subgroups defined by prior treatment history. METHODS: Annualized relapse rate and safety of once-daily oral fingolimod 0.5mg, 1.25mg, or once-weekly interferon β-1a 30μg intramuscular for 12 months were analyzed in 1292 patients with relapsing multiple sclerosis according to prior disease-modifying therapy, reason for prior disease-modifying therapy discontinuation (adverse events or unsatisfactory therapeutic effect), and prior disease-modifying therapy duration. RESULTS: Compared with interferon β-1a intramuscular, fingolimod 0.5mg significantly reduced annualized relapse rate in patients who were treatment naive, received prior interferon-β treatment, discontinued prior disease-modifying therapy for unsatisfactory therapeutic effect, or had prior disease-modifying therapy duration of ≥1 year (P≤0.05, all comparisons). Similar trends were observed in patients with prior glatiramer acetate treatment. Significant reductions were also seen with fingolimod 1.25mg for treatment-naive and prior interferon-β-treated patients. CONCLUSIONS: This analysis demonstrates superiority of fingolimod over interferon β-1a intramuscular regardless of prior (interferon-β) treatment and prior treatment efficacy and duration. ClinicalTrials.gov identifier: NCT00340834.