Acer tanks as osanetant Phase IIa trial fails

20 March 2023

US drug developer Acer Therapeutics (Nasdaq: ACER) saw its shares tumble as much as 50% on the news Friday, after it released disappointing results on its potential treatment for menopause symptoms.

The company announced that top-line results from its Phase IIa 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 it has conducted a thorough review of the full data set.

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