** Shares of biotech firm Anavex Life Sciences AVXL.O fall 18% to $3.43 premarket
** Co says it has withdrawn its EU application for experimental Alzheimer's drug, blarcamesine, after regulators said they could not support approval
** European Medicines Agency committee has said it was not in a position to give a positive opinion for the drug as an add-on treatment for early-stage patients, company says
** Anavex says it will collect more data and run further analyses to address concerns raised by regulators
** Drug is not approved anywhere and remains in development, co says
** Alzheimer's disease is the most common form of dementia, a condition that affects memory and thinking, mostly in older adults
** Shares down ~67% in 2025
(Reporting by Sahil Pandey in Bengaluru)
((Sahil.Pandey@thomsonreuters.com))