Acer Announces Publication of vEDS Patient Registry Data

Press Releases

NEWTON, MA April 16, 2019 – Acer Therapeutics Inc. (Nasdaq: ACER), a pharmaceutical company focused on the acquisition, development and commercialization of therapies for serious rare and life-threatening diseases with critical unmet medical needs, today announced the publication of long-term data from a cohort of COL3A1-positive vEDS patients in the Journal of the American College of Cardiology (JACC). The publication, entitled “Vascular Ehlers-Danlos Syndrome: Long-Term Observational Study,” was authored by Michael Frank, MD, Xavier Jeunemaitre, MD, PhD, and Pierre Boutouyrie, MD, PhD, et al.

An audio summary by Editor-in-Chief of JACC, Dr. Valentin Fuster, may be accessed (for free) via the following link:

The publication may be accessed (for purchase) here:

The editorial may be accessed (for purchase) here:

This published study describes outcomes in 144 COL3A1-positive vEDS patients clinically monitored and treated at the French National Referral Center for Rare Vascular Diseases (Paris, France) between the years 2000 and 2017. Patients were followed for a median of 5.3 years, and up to 20 years. At the initial work up, 50% of patients were not treated regularly and only 33.3% were taking celiprolol; by the end of the study period, the majority (90.3%) were treated with celiprolol alone or in combination with other medications. Once the maximum tolerated dose of celiprolol was reached, 90 (62.5%) patients remained at this dose throughout their follow-up. Only 5 (3.5%) patients required dose reduction due to fatigue, and no serious drug-related adverse event was recorded.

Patients had a lower mortality rate than that expected from the natural history of the disease as described in previous U.S. reports (1). Survival curve analysis showed that those not treated with celiprolol had a significantly worse outcome than celiprolol-treated patients: survival was 80.7% (95% CI 67.8%–93.6%) in those treated with celiprolol versus 48.5% (95% CI 19.7%–77.4%) in those not treated (p<0.001) after 11.1 years of follow-up. Survival was significantly higher in patients treated with a median dose of celiprolol of 400mg/day (n=83) vs. patients treated with a lower median dose of 217mg/d [100-300mg/day] (n=27), suggesting a dose effect and that 400mg/day should be considered the optimal dose. The authors also observed a relative decrease in hospitalization rates for acute arterial events during the time period in which the majority of patients were on celiprolol, suggesting a positive effect of celiprolol on the incidence and/or severity of new arterial events. The authors concluded that in this large, long-term cohort study, vEDS patients had a higher survival rate than expected relative to the known natural history of the disease and a lower annual occurrence of arterial complications, and that celiprolol use was potentially associated with these significant improvements in clinical outcomes.

“The higher overall survival in patients treated with celiprolol in this long-term study in COL3A1-positive vEDS patients appears to correlate with the significant event-free survival advantage that was reported in the Ong, et al. study of celiprolol treatment in vEDS patients (2),” said Michael Frank, MD, clinical investigator from the Paris group and first author of the publication.

“We are pleased to see this publication from the vEDS clinical investigator group in Paris which provides patients and physicians with a greater understanding of this chronic disease, including data suggesting a positive impact of celiprolol, which has a unique pharmacological profile,” said William Andrews, MD, FACP, Chief Medical Officer of Acer.

About Acer Therapeutics

Acer, headquartered in Newton, MA, is a pharmaceutical company focused on the acquisition, development and commercialization of therapies for serious rare and life-threatening diseases with critical unmet medical needs. Acer’s pipeline includes three clinical-stage candidates: EDSIVO™ (celiprolol) for the treatment of vascular Ehlers-Danlos syndrome (vEDS) in patients with a confirmed type III collagen (COL3A1) mutation; ACER-001 (a fully taste-masked, immediate release formulation of sodium phenylbutyrate) for the treatment of various inborn errors of metabolism, including urea cycle disorders (UCD) and Maple Syrup Urine Disease (MSUD); and osanetant for the treatment of various neuroendocrine disorders. Acer’s product candidates are believed to present a comparatively de-risked profile, having one or more of a favorable safety profile, clinical proof-of-concept data, mechanistic differentiation and an accelerated path for development, which may include utilizing expedited programs (e.g. Priority Review) established by the FDA and/or using the regulatory pathway established under section 505(b)(2) of the Federal Food, Drug, and Cosmetic Act (FFDCA) that allows an applicant to rely at least in part on third-party data for approval, which may expedite the preparation, submission and approval of a marketing application.

Disclosure notice: EDSIVO™ is an investigational drug candidate that has not been approved by the FDA for any indication. For more information, visit


(1) Pepin, et al. Survival is affected by mutation type and molecular mechanism in vascular Ehlers–Danlos syndrome (EDS type IV). Genet Med. 2014 Dec;16(12):881-8.

(2) Ong, et al. Effect of celiprolol on prevention of cardiovascular events in vascular Ehlers-Danlos syndrome: a prospective randomised, open, blinded-endpoints trial. Lancet. 2010; 376: 1476–84.

Forward-Looking Statements

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Acer Therapeutics

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