Intra-Cellular Therapies Inc. said its lead drug candidate had a similar rate of effectiveness to placebo in a Phase 3 schizophrenia trial.

The company's shares fell 65% in after-hours trading to $42.35.

The study of the biopharmaceutical company's ITI-007 treatment, which used risperidone as an active control, had a primary endpoint of change from baseline on the Positive and Negative Syndrome Scale score.

The two ITI-007 doses in the study demonstrated a change from baseline of minus 14.6 points and minus 15 points, compared with minus 15.1 points in placebo and 20.5 in risperidone.

Intra-Cellular said there was "an unusually high placebo response at certain sites which disproportionately affected the trial results."

Write to Josh Beckerman at josh.beckerman@wsj.com

 

(END) Dow Jones Newswires

September 28, 2016 17:25 ET (21:25 GMT)

Copyright (c) 2016 Dow Jones & Company, Inc.
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