** Shares of biotech firm Anavex Life Sciences AVXL.O rise 1.3% to $3.15 premarket
** Co says it plans pivotal trials of its experimental drug blarcamesine after new research suggested autism and Alzheimer's have similar underlying biology.
** Says studies showed both diseases share problems with "cell clean‑up," in which brain cells struggle to clear waste
** Adds blarcamesine targets a protein to help restore this cell clean-up process and studies have shown benefits in Alzheimer's and Rett syndrome
** Rett syndrome is a rare childhood neurological disorder that affects brain development, especially in girls, and causes loss of speech and movement
** As of last close, stock down ~13% YTD
(Reporting by Sahil Pandey in Bengaluru)
((Sahil.Pandey@thomsonreuters.com))