Real-World Safety and Effectiveness of 24-Hour Foslevodopa/Foscarbidopa in Parkinson's Disease: ROSSINI Study 6-Month Interim Results.

INTRODUCTION

Foslevodopa/foscarbidopa (LDp/CDp) is a nonsurgical 24-h continuous subcutaneous infusion for patients with advanced Parkinson's disease (aPD) and motor fluctuations uncontrolled on oral medications. We present the first multicountry real-world data from routine clinical practice.

METHODS

ROSSINI (NCT06107426) is an ongoing 3-year multicountry, prospective, observational study of adults with aPD who are LDp/CDp-naïve (cohort A) or transitioning from LDp/CDp open-label extension studies (NCT04379050/NCT04750226, cohort B). For this interim analysis, the primary endpoint was change from baseline to 6 months in OFF time [Movement Disorder Society Unified Parkinson's Disease Rating Scale Part IV (MDS-UPDRS-IV) modified item 4.3]. Safety was assessed by monitoring adverse events (AEs). Interim results for 105 cohort A patients enrolled ≥ 6 months by March 24, 2025 are presented only; cohort B results were limited (n = 5). Mixed-effects models for repeated measurements (continuous outcomes) were utilized, adjusted for country.

RESULTS

Cohort A patients had a mean (SD) age of 68.5 (9.5) years, PD duration of 12.1 (5.3) years, and least squares mean (SE) OFF time of 5.2 (0.6) h at baseline. Patients on LDp/CDp showed statistically significant reductions (95% CI) in OFF time [(- 2.8 h (- 3.6, - 1.9), P ≤ .001, n = 47/40 at baseline/month 6], dyskinesia time [- 1.8 h (- 2.6, - 0.9), P ≤ 0.001], MDS-UPDRS-III [- 5.0 (- 8.2, - 1.9), P = 0.002], Parkinson's Disease Sleep Scale-2 [- 5.2 (- 8.0, - 2.4), P ≤ .001], and 39-item Parkinson's Disease Questionnaire [PDQ-39, - 5.6 (- 9.2, - 2.0), P = .002] from baseline to month 6. Freezing of Gait Questionnaire, Gastrointestinal Dysfunction Scale in PD, and King's PD Pain Scale likewise showed statistically significant decreases (P < .05). Overall, 58 (55.2%) reported ≥ 1 AE, primarily nonserious and mild-to-moderate (12.4% serious, 17.1% severe), with hallucinations and infusion site events the most frequently reported events (5.7% each).

CONCLUSIONS

ROSSINI demonstrates reductions in motor fluctuations and nonmotor symptoms, and increased quality of life in patients with aPD after 6 months of LDp/CDp treatment. The safety profile was consistent with clinical trials.

TRIAL REGISTRATION: ClinicalTrials.gov identifier, NCT06107426.