** Shares of drug developer Anavex Life Sciences AVXL.O
fall 33% to $6.24 premarket
** Company says its experimental drug to treat a rare
neurodevelopmental disease, Rett syndrome, in pediatric patients
did not meet one of the main goals in a mid- to late-stage study
** The drug failed to show statistically significant
improvement on a scale used to measure symptom severity,
treatment response, when compared to placebo
** Company is also studying the drug to treat other
neurodevelopmental disorders such as Fragile X syndrome
** Rett syndrome occurs almost exclusively in girls and
leads to severe impairments in their ability to speak, walk, eat
and even breathe easily
(Reporting by Khushi Mandowara in Bengaluru)
((Khushi.Mandowara@thomsonreuters.com;))