0607 Improvement in Sleep Latency With FT218 (Once-Nightly Sodium Oxybate): Analysis From the Phase 3 REST-ON Clinical Trial

Abstract Introduction In the phase 3 REST-ON trial (NCT02720744), mean sleep latency on the Maintenance of Wakefulness Test (MWT) was significantly improved vs placebo with investigational, extended-release once-nightly sodium oxybate (FT218 [ON-SXB]; P< 0.001). This post hoc analysis assessed response to treatment and improvement in excessive daytime sleepiness (EDS). Methods Participants (≥16 years) with narcolepsy type 1/2 were randomized 1:1 to double-blind ON-SXB or placebo. Doses were 4.5 g week 1, 6 g weeks 2‒3, 7.5 g weeks 4‒8, and 9 g weeks 9‒13. Mean sleep latency on the MWT was measured in 5 trials up to 30 minutes each at baseline and weeks 3, 8, and 13. Percentage of participants with improvement of ≥5, ≥10, ≥15, and ≥20 minutes from baseline and with mean sleep latency=30 minutes were assessed. Two-sided P values were calculated using Fisher exact test. Results The modified intent-to-treat population included 190 participants (ON-SXB, n=97; placebo, n=93). At baseline, mean (SD) sleep latency was as follows: ON-SXB, 5.0 (3.1) minutes; placebo, 4.7 (2.6) minutes. More participants receiving ON-SXB vs placebo had mean MWT=30 minutes at weeks 3 (6 g; 5.7% vs 0%; P< 0.05), 8 (7.5 g; 10.5% vs 1.3%; P< 0.05), and 13 (9 g; 13.2% vs 5.1%; P=0.14). A significantly greater percentage of participants receiving ON-SXB vs placebo had improved mean sleep latency ≥5 to ≥20 minutes over baseline at all doses (6 g: ≥5 min, 57.5% vs 25.0%; ≥10 min, 35.6% vs 9.1%; ≥15 min, 18.4% vs 3.4%; ≥20 min, 10.3% vs 1.1% [all P< 0.01]; 7.5g: ≥5 min, 63.2% vs 28.2%; ≥10 min, 43.4% vs 11.5%; ≥15 min, 31.6% vs 3.8%; ≥20 min, 15.8% vs 1.3% [all P< 0.001]; 9 g: ≥5 min, 66.2% vs 37.2% [P< 0.001]; ≥10 min, 50.0% vs 19.2% [P< 0.001]; ≥15 min, 32.4% vs 10.3% [P< 0.01]; ≥20 min, 17.6% vs 6.4% [P< 0.05]). Conclusion Clinically significant improvements in EDS occurred with 6-, 7.5-, and 9-g doses of ON-SXB. At the 2 highest doses, >10% of participants remained awake for the entire MWT. If ON-SXB is granted FDA approval, adults with narcolepsy will have a once-nightly treatment to improve EDS. Support (if any) Avadel Pharmaceuticals

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