-- Compass Therapeutics (CMPX) reported that its experimental drug tovecimig did not meet the overall survival secondary endpoint in a phase 2/3 study in patients with advanced biliary tract cancer, the company said Monday.
Shares of the company fell more than 63% in recent pre-bell activity Monday.
The company said that tovecimig plus paclitaxel did not show a statistically significant overall survival benefit versus chemotherapy alone, largely due to high crossover from the control arm and prolonged survival after switching to the drug.
However, the study met other key endpoints, including statistically significant improvements in progression-free survival and overall response rate versus paclitaxel alone.
Compass Therapeutics plans to meet with the US Food and Drug Administration to discuss the results ahead of a planned biologics license application submission, it added.
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