Santhera Announces Publication of Long-Term Clinical Data with Vamorolone in Patients with Duchenne
Santhera announced a new publication in the journal PLOS Medicine describing new open-label, long-term clinical data on the safety, tolerability and efficacy of vamorolone in patients with Duchenne. PPMD is thrilled that the Phase 3 study is fully enrolled and we look forward to results and regulatory submission in 2021.
Santhera Announces Publication of Long-Term Clinical Data with Vamorolone in Patients with Duchenne Muscular Dystrophy
Pratteln, Switzerland, September 22, 2020 – Santhera Pharmaceuticals (SIX: SANN) announces that partner ReveraGen Biopharma Inc. and their academic collaborators have published new open-label, long-term clinical data on the safety, tolerability and efficacy of vamorolone in patients with Duchenne muscular dystrophy (DMD). These 18-month treatment data extend previously published 24-week treatment data, and show a reduction of corticosteroid-specific side effects and sustained efficacy with vamorolone including clinical improvement through the 18-month follow-up period.
This publication in the journal PLOS Medicine  provides peer-reviewed and detailed open-label data in patients with DMD treated for 18 months with vamorolone. A multi-center, open-label, 24-week trial (VBP15-003; [2, 3]) with a total 24-month long-term extension (VBP15-LTE; ) was conducted by the Cooperative International Neuromuscular Research Group (CINRG) and evaluated drug-related effects of vamorolone on motor outcomes and corticosteroid-associated safety concerns. This publication covers the 24-week Phase 2a trial (VBP15-003) and the first 12 months of the open-label extension trial (VBP15-LTE) adding up to a total treatment period of 18 months.
“This long-term study showed significant continued clinical improvement of all outcomes measured over an 18-month follow-up period,” said Edward C. Smith, MD, Associate Professor of Pediatrics, Duke University, Durham (North Carolina, USA), clinical investigator and lead-author of the publication. “Treatment-related efficacy responses with vamorolone were similar to those seen in an external control group with corticosteroid-treated patients. Both 4-stair climb and 10-meter run/walk tests were significantly improved when compared to steroid-naïve natural history control subjects.”
“Importantly, we also found that vamorolone did not show stunting of growth seen with deflazacort and prednisone, and vamorolone also showed fewer physician-reported adverse events such as mood disturbance, excessive hair growth, and Cushingoid appearance,” noted Eric Hoffman, PhD, Vice President of Research at ReveraGen BioPharma, Inc. and co-author of the study.
DMD trial participants (4 to <7 years at entry) treated with 2.0 or 6.0 mg/kg/day vamorolone for the full 18-month period (n=23) showed clinical improvement of all motor outcomes from baseline to month 18 (time to stand velocity, p = 0.012 [95% CI 0.010, 0.068 event/second]; run/walk 10 meters velocity, p < 0.001 [95% CI 0.220, 0.491 meters/second]; climb 4 stairs velocity, p = 0.001 [95% CI 0.034, 0.105 event/second]; 6-minute walk test, p = 0.001 [95% CI 31.14, 93.38 meters]; North Star Ambulatory Assessment, p < 0.001 [95% CI 2.702, 6.662 points]). Outcomes in vamorolone-treated DMD patients (n = 46) were compared to group-matched participants in the CINRG Duchenne Natural History Study (corticosteroid-naïve, n = 19; corticosteroid-treated, n = 68) over a similar 18-month period. Time to stand was not significantly different between vamorolone-treated and corticosteroid-naïve participants (p = 0.088; least squares [LS] mean 0.042 [95% CI –0.007, 0.091]), but vamorolone-treated participants showed significant improvement compared to group-matched corticosteroid-naïve participants for run/walk 10 meters velocity (p = 0.003; LS mean 0.286 [95% CI 0.104, 0.469]) and climb 4 stairs velocity (p = 0.027; LS mean 0.059 [95% CI 0.007, 0.111]). The vamorolone-related improvements were similar in magnitude to corticosteroid-related improvements. Corticosteroid-treated participants showed stunting of growth, whereas vamorolone-treated trial participants did not (p < 0.001; LS mean 15.86 [95% CI 8.51, 23.22]). Physician-reported incidences of adverse events (AEs) for Cushingoid appearance, hirsutism, weight gain, and behavior change were less for vamorolone than published incidences for prednisone and deflazacort.