Santhera Pharmaceuticals Holding AG announced positive key results from the VISION-DMD study, demonstrating robust efficacy across multiple efficacy endpoints and favorable safety and tolerability of vamorolone in the treatment of patients with DMD. VISION-DMD is a pivotal Phase 2b study designed to demonstrate efficacy and safety of vamorolone compared to placebo and prednisone (active control) in the treatment of DMD. In the first 24-week double-blind period, of which the topline data readout is presented here, 121 ambulant boys aged 4 to <7 years with DMD were randomized to receive vamorolone (low dose 2 mg/kg/day or high dose 6 mg/kg/day) or prednisone (0.75 mg/kg/day) or placebo. A second period of 24 weeks, where all participants receive vamorolone treatment on either of the two dose levels, will continue to capture additional longer term safety and tolerability data. Vamorolone demonstrates efficacy across primary and secondary endpoints and over a broad dose range The study met its primary endpoint of superiority in change of time to stand from supine positioning to standing (TTSTAND) velocity with vamorolone 6 mg/kg/day versus placebo (p=0.002) with a treatment difference of 0.06 rises/second from baseline. This corresponds to a clinically relevant improvement in TTSTAND in the vamorolone 6 mg/kg/day group from 6.0 to 4.6 seconds and a corresponding deterioration in the placebo group from 5.4 to 5.5 seconds. The study also demonstrated superiority of vamorolone versus placebo across multiple secondary endpoints which include (in the order of pre-defined hierarchy): TTSTAND velocity for 2 mg/kg/day (p=0.02), 6MWT for 6 mg/kg/day (p=0.003) and 2 mg/kg/day (p=0.009), TTRW for 6 mg/kg/day (p=0.002). The clinical results establish the efficacy of vamorolone over a wide, threefold dose range from 2 to 6 mg/kg/day. No statistically significant differences were observed between vamorolone 6 mg/kg/day and prednisone across the above endpoints. The study completion rate at 24 weeks was 94% (or 114 of 121 participants). Vamorolone at both doses of 2 and 6 mg/kg/day showed a favorable safety and tolerability profile. In the vamorolone groups, no grade 3 or higher treatment emergent adverse events (TEAEs) or adverse events leading to study discontinuation were observed. The total number of TEAEs was lower in the vamorolone 2 mg/kg/day (events n=96) and 6 mg/kg/day (n=91) groups compared to prednisone (n=120). In a prespecified analysis of clinically relevant adverse events (moderate, severe, serious or leading to discontinuation due to safety), defined for the EMA and conducted by Santhera, vamorolone 6 mg/kg/day was significantly superior to prednisone (n=6 vs n=19, p=0.02). As previously published, in open-label studies of 2.5 years duration (113 patient years), vamorolone did not show stunting of growth as reported with conventional corticosteroids. Particularly noteworthy, this was validated in the current 24-week double-blind study where vamorolone 6 mg/kg/day versus prednisone 0.75 mg/kg/day showed a significant difference in growth velocity (p=0.02).