Acer Therapeutics (ACER) ACER-801 Phase 2a Trial Did Not Achieve Statistical Significance
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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 significant unmet medical needs, today announced that topline results from its Phase 2a proof of concept clinical trial to evaluate ACER-801 (osanetant) as a potential treatment for moderate to severe Vasomotor Symptoms (VMS) associated with menopause showed that ACER-801 was safe and well-tolerated but did not achieve statistical significance when evaluating ACER-801’s ability to decrease the frequency or severity of hot flashes in postmenopausal women.
As a result, Acer is pausing the ACER-801 program until Acer has conducted a thorough review of the full data set. Concurrently, Acer is continuing to focus on preparation for its commercial launch of OLPRUVA™ (sodium phenylbutyrate) for oral suspension for the treatment of urea cycle disorders (UCDs) involving deficiencies of carbamylphosphate synthetase (CPS), ornithine transcarbamylase (OTC), or argininosuccinic acid synthetase (AS), and the ongoing pivotal Phase 3 clinical evaluation of EDSIVO™ (celiprolol) for vascular Ehlers-Danlos Syndrome (vEDS) in patients with a confirmed type III collagen (COL3A1) mutation, subject in each instance to availability of additional capital beyond early in Q2 2023.
“We are surprised and disappointed the Phase 2a trial did not meet its efficacy objectives in treating VMS given the extensive body of non-clinical and clinical evidence previously generated,” stated Chris Schelling, CEO and Founder of Acer. “We intend to conduct a comprehensive analysis of the totality of the clinical trial data – including the pharmacokinetic data, which has not yet been analyzed – which will inform our path forward for the program, including our collaborations for prostate cancer and post-traumatic stress disorder (PTSD). We wish to thank the patients, investigators and partners who participated in this clinical trial. We remain committed to our mission to provide transformative treatments to underserved and overlooked patients with rare and life-threatening diseases and will continue to focus our resources on launch preparation for our FDA-approved product, OLPRUVA™, for oral suspension for the treatment of UCDs involving deficiencies of CPS, OTC or AS, as well as our pivotal Phase 3 clinical trial of EDSIVO™ for vEDS.”
About ACER-801 (osanetant)ACER-801 (osanetant) is an investigational non-hormonal, neurokinin 3 receptor (NK3R) antagonist being studied for the potential treatment of patients with Vasomotor Symptoms (VMS), prostate cancer and post-traumatic stress disorder (PTSD). In December 2018, Acer entered into an exclusive license agreement with Sanofi to acquire worldwide rights to ACER-801 (osanetant). In the Phase 2a study, forty-nine postmenopausal women aged 40-65 who experienced moderate to severe hot flashes were randomized 1:1:1:1 and received either twice daily 50 mg, 100 mg, 200 mg of ACER-801 or placebo over a 14-day treatment period, followed by a 14-day safety follow-up assessment. Primary endpoints were safety and pharmacokinetics, with efficacy compared to placebo as a secondary endpoint.
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